Journal & Issues

Volume 25 (2023): Issue 1 (March 2023)

Volume 24 (2022): Issue 4 (December 2022)

Volume 24 (2022): Issue 3 (September 2022)

Volume 24 (2022): Issue 2 (June 2022)

Volume 24 (2022): Issue 1 (March 2022)

Volume 23 (2021): Issue 4 (December 2021)

Volume 23 (2021): Issue 3 (September 2021)

Volume 23 (2021): Issue 2 (June 2021)

Volume 23 (2021): Issue 1 (March 2021)

Volume 22 (2020): Issue 4 (December 2020)

Volume 22 (2020): Issue 3 (September 2020)

Volume 22 (2020): Issue 2 (June 2020)

Volume 22 (2020): Issue 1 (March 2020)

Volume 21 (2019): Issue 4 (December 2019)

Volume 21 (2019): Issue 3 (September 2019)

Volume 21 (2019): Issue 2 (June 2019)

Volume 21 (2019): Issue 1 (March 2019)

Volume 20 (2018): Issue 4 (December 2018)

Volume 20 (2018): Issue 3 (September 2018)

Volume 20 (2018): Issue 2 (June 2018)

Volume 20 (2018): Issue 1 (March 2018)

Volume 19 (2017): Issue 4 (December 2017)

Volume 19 (2017): Issue 3 (September 2017)

Volume 19 (2017): Issue 2 (June 2017)

Volume 19 (2017): Issue 1 (March 2017)

Volume 18 (2016): Issue 4 (December 2016)

Volume 18 (2016): Issue 3 (September 2016)

Volume 18 (2016): Issue 2 (June 2016)

Volume 18 (2016): Issue 1 (March 2016)

Volume 17 (2015): Issue 4 (December 2015)

Volume 17 (2015): Issue 3 (September 2015)

Volume 17 (2015): Issue 2 (June 2015)

Volume 17 (2015): Issue 1 (March 2015)

Volume 16 (2014): Issue 4 (December 2014)

Volume 16 (2014): Issue 3 (September 2014)

Volume 16 (2014): Issue 2 (June 2014)

Volume 16 (2014): Issue 1 (March 2014)

Volume 15 (2013): Issue 4 (December 2013)

Volume 15 (2013): Issue 3 (September 2013)

Volume 15 (2013): Issue 1 (March 2013)

Volume 14 (2012): Issue 4 (December 2012)

Volume 14 (2012): Issue 3 (October 2012)

Volume 14 (2012): Issue 2 (June 2012)

Volume 14 (2012): Issue 1 (March 2012)

Volume 13 (2011): Issue 4 (December 2011)

Volume 13 (2011): Issue 3 (September 2011)

Volume 13 (2011): Issue 2 (June 2011)

Volume 13 (2011): Issue 1 (March 2011)

Volume 12 (2010): Issue 4 (December 2010)

Volume 12 (2010): Issue 3 (September 2010)

Volume 12 (2010): Issue 2 (June 2010)

Volume 12 (2010): Issue 1 (March 2010)

Volume 11 (2009): Issue 4 (December 2009)

Volume 11 (2009): Issue 3 (September 2009)

Volume 11 (2009): Issue 2 (June 2009)

Volume 11 (2009): Issue 1 (March 2009)

Volume 10 (2008): Issue 4 (December 2008)

Volume 10 (2008): Issue 3 (September 2008)

Volume 10 (2008): Issue 2 (June 2008)

Volume 10 (2008): Issue 1 (March 2008)

Volume 9 (2007): Issue 4 (December 2007)

Volume 9 (2007): Issue 3 (September 2007)

Volume 9 (2007): Issue 2 (June 2007)

Volume 9 (2007): Issue 1 (March 2007)

Journal Details
Format
Journal
eISSN
1899-4741
First Published
03 Jul 2007
Publication timeframe
4 times per year
Languages
English

Search

Volume 22 (2020): Issue 3 (September 2020)

Journal Details
Format
Journal
eISSN
1899-4741
First Published
03 Jul 2007
Publication timeframe
4 times per year
Languages
English

Search

10 Articles
Open Access

Modeling and computing of stress and strain distribution in UHMW polyethylene elements of chosen artificial human joints

Published Online: 02 Oct 2020
Page range: 1 - 8

Abstract

Abstract

The aim of the study was to present numerical strength analysis of the virtual knee and hip joints for the most popular tribological pairs used in prosthetic arthroplasty based on the Finite Elements Method. FEM makes it possible to calculate the stress in particular elements of the tested models. The research was dedicated to elucidate abrasive wear mechanisms during surface grinding of a polyethylene UHMW and a metal elements of endoprostheses. Strong adhesion was found between the abrasives and workpieces, which might be attributed to the chemical bonding between the abrasives and workpieces in synovial liquid. Therefore, the wear of UHMWPE is both chemical and physical. Abrasive wear effect, as a result of the abrasive wear process, is associated with material loss of the element surface layer due to the separation of particles by fissuring, stretching, or micro-cutting.

Keywords

  • UHMW polyethylene
  • knee and hip joint endoprostheses
  • FEM
  • abrasive wear
  • tribo-chemical wear
Open Access

Calcium alginate/activated carbon/humic acid tri-system porous fibers for removing tetracycline from aqueous solution

Published Online: 02 Oct 2020
Page range: 9 - 16

Abstract

Abstract

In this study, activated carbon and humic acid powder were fixed by the cross-linking reaction of sodium alginate. Calcium alginate/activated carbon/humic acid (CAH) tri-system porous fibers were prepared by the wet spinning method and freeze-dried for the removal of tetracycline in aqueous solution. Subsequently, the morphology and structure of CAH fibers were measured by scanning electron microscopy (SEM) and the Brunauer-Emmett-Teller (BET) method. The effect of pH, contact time, temperature and other factors on adsorption behavior were analyzed. The Langmuir and Freundlich isotherm models were used to fit tetracycline adsorption equilibrium data. The dynamics data were evaluated by the pseudo-second-order model, the pseudo-second-order model and the intraparticle diffusion model. Thermodynamic study confirmed that the adsorption of tetracycline on CAH fibers was a spontaneous process.

Keywords

  • Sodium alginate
  • Humic acid
  • Activated carbon
  • Adsorption
  • Tetracycline
Open Access

Preparation of a solid product with high water content and water retention properties

Published Online: 02 Oct 2020
Page range: 17 - 23

Abstract

Abstract

This work presents the development of a solid product with a high water content (99.08%) and water retention properties. Water was chosen as a potential carrier of a volatile active substance and water retaining properties of material were studied at a temperatures and relative air humidity values with the support of the theory of drying. The study first confirmed the role of Gibbs’ phase rule in the research of solid-gas phase equilibrium, and second presented drying kinetics developed from Fick’s second law and expressed with the first term of the Fourier equation. Solutions of equations for phase equilibrium and mass transfer enabled the calculation of Luikov’s parameters, which are important for equilibrium relations and for the diffusivity of water in a solid for mass transfer prediction. The obtained thermodynamic and kinetic parameters enabled product characterisation that may be important for the prediction of retention times.

Keywords

  • water in organic phase emulsion
  • phase equilibrium
  • mass transfer
  • Luikov’s parameters
  • theory of drying
Open Access

Nitrogen-doped Carbon Catalyst by Ultrasonic for Electrocatalytic CO2 Reduction

Published Online: 02 Oct 2020
Page range: 24 - 38

Abstract

Abstract

The electrocatalytic reduction of carbon dioxide into valued chemicals such as formic acid has the most promising potential in applying renewable energy for useful materials and mitigating the greenhouse effect. However, the studies still focus on developing catalysts with low price and high catalytic properties. In this study, nitrogen atoms were decorated into carbon structure by a unique ultrasonic method, then the nitrogen-doped carbon material was applied as catalyst in CO2 reduction, it exhibited excellent electrochemical activity, 4 times higher than the normal method. The improved activity should be attributed to the interaction between nitrogen and carbon atoms through analysis.

Keywords

  • Nitrogen-doped
  • Catalyst
  • Ultrasonic
  • CO Reduction
Open Access

Investigation of the inhibitory-bactericidal effect of amidoamine-based inorganic complexes against microbiological and atmospheric corrosion

Published Online: 02 Oct 2020
Page range: 29 - 37

Abstract

Abstract

In the process, inorganic complexes of amidoamines obtained from the interaction of natural petroleum acid and oleic acids with diethylenetriamine have been developed and their effectiveness as inhibitor-bactericides has been investigated. The effect of the synthesized reagents on the kinetics of the corrosion process of steel and the activity of sulphate-reducing bacteria in 3% NaCl solution saturated with CO2 and in the biphasic water–isopropyl alcohol medium with H2S dissolved has been analyzed. The thermodynamic and kinetic parameters of the corrosion process were calculated. The adsorption of the complexes was investigated using the Langmuir isotherm and the correlation constant was determined. State of the metal surface was investigated by SEM method in CO2 and H2S media, with and without inhibitors, and the metal surface contact of complexes was studied by computer molecular simulation.

Keywords

  • corrosion
  • inhibitor
  • bactericide
  • adsorption
  • amidoamine
Open Access

Study on particle movement characteristics in sandblast cylinder based on PIV technology

Published Online: 02 Oct 2020
Page range: 38 - 47

Abstract

Abstract

PIV technology was used to investigate the influence of the particles’ relevant parameters on the instantaneous movement characteristics in the sandblast cylinder under the circumstance of different particle sizes, different section heights and different stacking conditions. As the diameter increased, particles had a greater velocity and energy when approaching the wall, which would cause a serious abrasion. The influence of test selection factors on the particles’ radial velocity of particles was greater than that on axial velocity. The radial velocity and axial velocity on the surface of the cylindrical section were all reduced to a lower level when the particles approach the tank wall. When r > 0.3 R, the particle velocity maintained at a higher level, but then decreased slowly when r > 0.7 R. Therefore, the abrasion of the conical section of the sandblast cylinder when r > 0.3 R should be paid more attention to.

Keywords

  • PIV technology
  • Sandblast cylinder
  • Particles
  • Movement characteristics
Open Access

Enzymatic extraction of potato starch: A parametric optimization study using response surface methodology

Published Online: 02 Oct 2020
Page range: 48 - 54

Abstract

Abstract

Optimized, effective and efficient methodology has been determined in this research work for the recovery of starch from potatoes. Potato starch extraction experimental results have been utilized for the parametric optimization study by using different statistical techniques. In this research work, starch extraction was conducted by employing cellulase enzyme. Response surface methodology (RSM) was put to use to perform statistical analysis to get optimum results. Five-level central composite design (CCD) consisting of three parameters was implemented to investigate the effect of enzyme concentration, contact time and broth dilution. Experiment results revealed that increment in enzyme concentration and contact time enhanced the starch recovery while dilution showed the inverse relation on the recovery of starch. Optimum starch recovery was achieved upto 89% when enzyme concentration (0.5 g/100 g) of potato meal was diluted with 10 mL of water and mixed for 4 h at 45°C.

Keywords

  • Response Surface methodology (RSM)
  • Potato
  • Starc
  • Optimisation
  • Extraction Parameters
Open Access

Technological aspects of synthesis of poly(ethylene glycol) mono-1-propenyl ether monomers

Published Online: 02 Oct 2020
Page range: 55 - 63

Abstract

Abstract

For the first time, the technological aspects of the highly productive and selective synthesis of UV-reactive poly(ethylene glycol) mono-1-propenyl ether monomers was developed. The solvent-free isomerization of model commercial available 2-allyloxyethanol and allyloxypoly(ethylene glycol) derivatives, type Allyl–[OCH2CH2]n–OH, n = 1–5, into a 1-propenyl derivative under the homogeneous catalysis conditions using the ruthenium complexes were evaluated. The effect of a various reaction conditions (i.e. the concentration of [Ru] complex, the reaction temperature, reaction gas atmosphere) together with trace amounts of allyl hydroperoxides formed via autoxidation reaction of allyl substrates on the productivity of catalyst was examined in detail. Moreover, the significant role of the allyl substrate structures on the catalytic activity of ruthenium catalysts were also recognized. The optimal parameters of the scaled-up synthesis together with productivity of catalyst were first established.

Keywords

  • polyethylene glycol allyl ether
  • 1-propenyl ether
  • isomerization
  • ruthenium complex
  • photo-polymerization
Open Access

Study of thermal degradation behavior and kinetics of ABS/PC blend

Published Online: 02 Oct 2020
Page range: 64 - 69

Abstract

Abstract

This work investigated kinetics and thermal degradation of acrylonitrile butadiene styrene and polycarbonate (ABS/PC) blend using thermogravimetric analysis in the range of 25 to 520°C. For thermal degradation of blend, activation energy (Ea) and pre-exponential factor (A) were calculated under various heating rates as 5, 10, 15 and 20°C/min using iso-conversional model-free methods (Kissinger, Flynn-Wall- Ozawa and Friedman). Mass loss of the blend as a function of temperature was plotted as thermogravimetric curve (TG) while derivative values of mass loss were drawn as derivative thermogravimetric (DTG) curve. Using Kissinger method, Ea was 51.4 kJ/mol, while values calculated from FWO and Friedman method were 86–161 and 30–251 kJ/mol respectively. Results showed increasing trend of Ea with higher conversion values indicating different degradation mechanisms at the initial and final stages of the experiment. Thermodynamic parameters such as enthalpy change (ΔH), Gibbs free energy (ΔG) and entropy change (ΔS) were also calculated.

Keywords

  • ABS/PC blend
  • thermal degradation
  • iso-conversional analysis
  • activation energy
  • thermodynamic parameters
Open Access

Comparative Study on NH3-SCR of High Entropy Mineral Catalytic Materials for Different Ratios of Rare Earth Concentrate/Rare Earth Tailing

Published Online: 02 Oct 2020
Page range: 70 - 78

Abstract

Abstract

A series of high-entropy mineral catalytic materials were obtained by mixing rare earth tailings containing Fe oxide and rare earth concentrate rich in Ce in Baiyun Obo in different proportions, and by acid-base leaching and microwave roasting. The effects of different proportions of mixed rare earth minerals on the denitrification activity of the samples were analyzed by various techniques, including XRD, EDS and SEM. The mineral phase structure and surface morphology of the catalysts were analyzed. The surface properties of the samples were tested by TPD and XPS methods. The denitrification activity of the sample was simultaneously evaluated and compared in the microreactor. The results show that the denitration efficiency of the active powder is the best when the mixing ratio of rare earth tailings/rare earth concentrate is 1:1, the denitration rate can reach 82%. In summary, different proportions of optimization are extremely effective methods to improve catalyst performance.

Keywords

  • rare earth concentrate
  • rare earth tailings
  • catalytic denitrification
  • modification
  • mineral catalysis
10 Articles
Open Access

Modeling and computing of stress and strain distribution in UHMW polyethylene elements of chosen artificial human joints

Published Online: 02 Oct 2020
Page range: 1 - 8

Abstract

Abstract

The aim of the study was to present numerical strength analysis of the virtual knee and hip joints for the most popular tribological pairs used in prosthetic arthroplasty based on the Finite Elements Method. FEM makes it possible to calculate the stress in particular elements of the tested models. The research was dedicated to elucidate abrasive wear mechanisms during surface grinding of a polyethylene UHMW and a metal elements of endoprostheses. Strong adhesion was found between the abrasives and workpieces, which might be attributed to the chemical bonding between the abrasives and workpieces in synovial liquid. Therefore, the wear of UHMWPE is both chemical and physical. Abrasive wear effect, as a result of the abrasive wear process, is associated with material loss of the element surface layer due to the separation of particles by fissuring, stretching, or micro-cutting.

Keywords

  • UHMW polyethylene
  • knee and hip joint endoprostheses
  • FEM
  • abrasive wear
  • tribo-chemical wear
Open Access

Calcium alginate/activated carbon/humic acid tri-system porous fibers for removing tetracycline from aqueous solution

Published Online: 02 Oct 2020
Page range: 9 - 16

Abstract

Abstract

In this study, activated carbon and humic acid powder were fixed by the cross-linking reaction of sodium alginate. Calcium alginate/activated carbon/humic acid (CAH) tri-system porous fibers were prepared by the wet spinning method and freeze-dried for the removal of tetracycline in aqueous solution. Subsequently, the morphology and structure of CAH fibers were measured by scanning electron microscopy (SEM) and the Brunauer-Emmett-Teller (BET) method. The effect of pH, contact time, temperature and other factors on adsorption behavior were analyzed. The Langmuir and Freundlich isotherm models were used to fit tetracycline adsorption equilibrium data. The dynamics data were evaluated by the pseudo-second-order model, the pseudo-second-order model and the intraparticle diffusion model. Thermodynamic study confirmed that the adsorption of tetracycline on CAH fibers was a spontaneous process.

Keywords

  • Sodium alginate
  • Humic acid
  • Activated carbon
  • Adsorption
  • Tetracycline
Open Access

Preparation of a solid product with high water content and water retention properties

Published Online: 02 Oct 2020
Page range: 17 - 23

Abstract

Abstract

This work presents the development of a solid product with a high water content (99.08%) and water retention properties. Water was chosen as a potential carrier of a volatile active substance and water retaining properties of material were studied at a temperatures and relative air humidity values with the support of the theory of drying. The study first confirmed the role of Gibbs’ phase rule in the research of solid-gas phase equilibrium, and second presented drying kinetics developed from Fick’s second law and expressed with the first term of the Fourier equation. Solutions of equations for phase equilibrium and mass transfer enabled the calculation of Luikov’s parameters, which are important for equilibrium relations and for the diffusivity of water in a solid for mass transfer prediction. The obtained thermodynamic and kinetic parameters enabled product characterisation that may be important for the prediction of retention times.

Keywords

  • water in organic phase emulsion
  • phase equilibrium
  • mass transfer
  • Luikov’s parameters
  • theory of drying
Open Access

Nitrogen-doped Carbon Catalyst by Ultrasonic for Electrocatalytic CO2 Reduction

Published Online: 02 Oct 2020
Page range: 24 - 38

Abstract

Abstract

The electrocatalytic reduction of carbon dioxide into valued chemicals such as formic acid has the most promising potential in applying renewable energy for useful materials and mitigating the greenhouse effect. However, the studies still focus on developing catalysts with low price and high catalytic properties. In this study, nitrogen atoms were decorated into carbon structure by a unique ultrasonic method, then the nitrogen-doped carbon material was applied as catalyst in CO2 reduction, it exhibited excellent electrochemical activity, 4 times higher than the normal method. The improved activity should be attributed to the interaction between nitrogen and carbon atoms through analysis.

Keywords

  • Nitrogen-doped
  • Catalyst
  • Ultrasonic
  • CO Reduction
Open Access

Investigation of the inhibitory-bactericidal effect of amidoamine-based inorganic complexes against microbiological and atmospheric corrosion

Published Online: 02 Oct 2020
Page range: 29 - 37

Abstract

Abstract

In the process, inorganic complexes of amidoamines obtained from the interaction of natural petroleum acid and oleic acids with diethylenetriamine have been developed and their effectiveness as inhibitor-bactericides has been investigated. The effect of the synthesized reagents on the kinetics of the corrosion process of steel and the activity of sulphate-reducing bacteria in 3% NaCl solution saturated with CO2 and in the biphasic water–isopropyl alcohol medium with H2S dissolved has been analyzed. The thermodynamic and kinetic parameters of the corrosion process were calculated. The adsorption of the complexes was investigated using the Langmuir isotherm and the correlation constant was determined. State of the metal surface was investigated by SEM method in CO2 and H2S media, with and without inhibitors, and the metal surface contact of complexes was studied by computer molecular simulation.

Keywords

  • corrosion
  • inhibitor
  • bactericide
  • adsorption
  • amidoamine
Open Access

Study on particle movement characteristics in sandblast cylinder based on PIV technology

Published Online: 02 Oct 2020
Page range: 38 - 47

Abstract

Abstract

PIV technology was used to investigate the influence of the particles’ relevant parameters on the instantaneous movement characteristics in the sandblast cylinder under the circumstance of different particle sizes, different section heights and different stacking conditions. As the diameter increased, particles had a greater velocity and energy when approaching the wall, which would cause a serious abrasion. The influence of test selection factors on the particles’ radial velocity of particles was greater than that on axial velocity. The radial velocity and axial velocity on the surface of the cylindrical section were all reduced to a lower level when the particles approach the tank wall. When r > 0.3 R, the particle velocity maintained at a higher level, but then decreased slowly when r > 0.7 R. Therefore, the abrasion of the conical section of the sandblast cylinder when r > 0.3 R should be paid more attention to.

Keywords

  • PIV technology
  • Sandblast cylinder
  • Particles
  • Movement characteristics
Open Access

Enzymatic extraction of potato starch: A parametric optimization study using response surface methodology

Published Online: 02 Oct 2020
Page range: 48 - 54

Abstract

Abstract

Optimized, effective and efficient methodology has been determined in this research work for the recovery of starch from potatoes. Potato starch extraction experimental results have been utilized for the parametric optimization study by using different statistical techniques. In this research work, starch extraction was conducted by employing cellulase enzyme. Response surface methodology (RSM) was put to use to perform statistical analysis to get optimum results. Five-level central composite design (CCD) consisting of three parameters was implemented to investigate the effect of enzyme concentration, contact time and broth dilution. Experiment results revealed that increment in enzyme concentration and contact time enhanced the starch recovery while dilution showed the inverse relation on the recovery of starch. Optimum starch recovery was achieved upto 89% when enzyme concentration (0.5 g/100 g) of potato meal was diluted with 10 mL of water and mixed for 4 h at 45°C.

Keywords

  • Response Surface methodology (RSM)
  • Potato
  • Starc
  • Optimisation
  • Extraction Parameters
Open Access

Technological aspects of synthesis of poly(ethylene glycol) mono-1-propenyl ether monomers

Published Online: 02 Oct 2020
Page range: 55 - 63

Abstract

Abstract

For the first time, the technological aspects of the highly productive and selective synthesis of UV-reactive poly(ethylene glycol) mono-1-propenyl ether monomers was developed. The solvent-free isomerization of model commercial available 2-allyloxyethanol and allyloxypoly(ethylene glycol) derivatives, type Allyl–[OCH2CH2]n–OH, n = 1–5, into a 1-propenyl derivative under the homogeneous catalysis conditions using the ruthenium complexes were evaluated. The effect of a various reaction conditions (i.e. the concentration of [Ru] complex, the reaction temperature, reaction gas atmosphere) together with trace amounts of allyl hydroperoxides formed via autoxidation reaction of allyl substrates on the productivity of catalyst was examined in detail. Moreover, the significant role of the allyl substrate structures on the catalytic activity of ruthenium catalysts were also recognized. The optimal parameters of the scaled-up synthesis together with productivity of catalyst were first established.

Keywords

  • polyethylene glycol allyl ether
  • 1-propenyl ether
  • isomerization
  • ruthenium complex
  • photo-polymerization
Open Access

Study of thermal degradation behavior and kinetics of ABS/PC blend

Published Online: 02 Oct 2020
Page range: 64 - 69

Abstract

Abstract

This work investigated kinetics and thermal degradation of acrylonitrile butadiene styrene and polycarbonate (ABS/PC) blend using thermogravimetric analysis in the range of 25 to 520°C. For thermal degradation of blend, activation energy (Ea) and pre-exponential factor (A) were calculated under various heating rates as 5, 10, 15 and 20°C/min using iso-conversional model-free methods (Kissinger, Flynn-Wall- Ozawa and Friedman). Mass loss of the blend as a function of temperature was plotted as thermogravimetric curve (TG) while derivative values of mass loss were drawn as derivative thermogravimetric (DTG) curve. Using Kissinger method, Ea was 51.4 kJ/mol, while values calculated from FWO and Friedman method were 86–161 and 30–251 kJ/mol respectively. Results showed increasing trend of Ea with higher conversion values indicating different degradation mechanisms at the initial and final stages of the experiment. Thermodynamic parameters such as enthalpy change (ΔH), Gibbs free energy (ΔG) and entropy change (ΔS) were also calculated.

Keywords

  • ABS/PC blend
  • thermal degradation
  • iso-conversional analysis
  • activation energy
  • thermodynamic parameters
Open Access

Comparative Study on NH3-SCR of High Entropy Mineral Catalytic Materials for Different Ratios of Rare Earth Concentrate/Rare Earth Tailing

Published Online: 02 Oct 2020
Page range: 70 - 78

Abstract

Abstract

A series of high-entropy mineral catalytic materials were obtained by mixing rare earth tailings containing Fe oxide and rare earth concentrate rich in Ce in Baiyun Obo in different proportions, and by acid-base leaching and microwave roasting. The effects of different proportions of mixed rare earth minerals on the denitrification activity of the samples were analyzed by various techniques, including XRD, EDS and SEM. The mineral phase structure and surface morphology of the catalysts were analyzed. The surface properties of the samples were tested by TPD and XPS methods. The denitrification activity of the sample was simultaneously evaluated and compared in the microreactor. The results show that the denitration efficiency of the active powder is the best when the mixing ratio of rare earth tailings/rare earth concentrate is 1:1, the denitration rate can reach 82%. In summary, different proportions of optimization are extremely effective methods to improve catalyst performance.

Keywords

  • rare earth concentrate
  • rare earth tailings
  • catalytic denitrification
  • modification
  • mineral catalysis