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Synthesis and characterization of Cu-MFI catalyst for the direct medium temperature range NO decomposition

Karolina Maduna Valkaj
Karolina Maduna Valkaj
, 
Vesna Tomašić
Vesna Tomašić
, 
Andrea Katović
Andrea Katović
 and 
ElżBieta Bielańska
ElżBieta Bielańska
   | Apr 27, 2016
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Article Category: Research Article
Published Online: Apr 27, 2016
Page range: 177 - 184
Received: Oct 12, 2015
Accepted: Dec 03, 2015
DOI: https://doi.org/10.1515/msp-2016-0018
Keywords
© 2016 Wroclaw University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Fig. 1

SEM images of zeolite samples: (a) Cu-MFIa, (b) Cu-MFIb (c) Cu,Al-MFIc, (d) Cu,Zn-MFId.
SEM images of zeolite samples: (a) Cu-MFIa, (b) Cu-MFIb (c) Cu,Al-MFIc, (d) Cu,Zn-MFId.

Fig. 2

X-ray diffraction patterns of the zeolite samples Cu,Zn-MFId, Cu,Al-MFIc, Cu-MFIb and Cu-MFIa. Vertical arrows represent the peak positions of the reported powder patterns for the corresponding material (JCPDS-ICDD Card No. 37-0361).
X-ray diffraction patterns of the zeolite samples Cu,Zn-MFId, Cu,Al-MFIc, Cu-MFIb and Cu-MFIa. Vertical arrows represent the peak positions of the reported powder patterns for the corresponding material (JCPDS-ICDD Card No. 37-0361).

Fig. 3

EPR spectra of hydrated Cu-MFI at room temperature: (a) Cu-MFIa, (b) Cu,Al-MFIc, (c) Cu,ZnMFId.
EPR spectra of hydrated Cu-MFI at room temperature: (a) Cu-MFIa, (b) Cu,Al-MFIc, (c) Cu,ZnMFId.

Fig. 4

Dependence of NO conversion for obtained different flow rates of the reactant gas 723 K for fresh and reused Cu-MFIa catalyst.
Dependence of NO conversion for obtained different flow rates of the reactant gas 723 K for fresh and reused Cu-MFIa catalyst.

Fig. 5

Influence of the pre-reaction thermal treatment of the catalyst at different calcination temperatures on the molar fraction of nitrogen in the reaction products for Cu-MFIa catalyst at different normalized residence times.
Influence of the pre-reaction thermal treatment of the catalyst at different calcination temperatures on the molar fraction of nitrogen in the reaction products for Cu-MFIa catalyst at different normalized residence times.

Fig. 6

Molar fraction of NO in the reaction products as a function of normalized residence times at temperatures lower than 623 K.
Molar fraction of NO in the reaction products as a function of normalized residence times at temperatures lower than 623 K.

Fig. 7

Molar fraction of NO in the reaction products as a function of normalized residence times at different reaction temperatures (Cu,Zn-MFIdzeolite).
Molar fraction of NO in the reaction products as a function of normalized residence times at different reaction temperatures (Cu,Zn-MFIdzeolite).

Fig. 8

Comparison of different catalysts in NO decomposition at higher reaction temperature (> 723 K).
Comparison of different catalysts in NO decomposition at higher reaction temperature (> 723 K).

Evaluated parameters obtained from the prominent peaks position in EPR spectra for corresponding Cu+ centers.

Zeolite catalystA║ [mT]g║g⊥Intensity of EPR catalyst signal [a. u.]
Cu-MFIa12.02.3712.12917.25
Cu,Al-MFIc12.42.3722.0722.53
Cu,Zn-MFId12.42.3922.0811.83

The physico-chemical properties of the prepared zeolite catalysts.

Zeolite catalystMethod of preparationSi/Al ratioCopper content [wt.%]Surface area [m2·g−1]Pore volume [cm3·g−1]
Cu-MFIaion exchange401.92395.20.175
Cu-MFIbion exchange283.65425.60.193
Cu,Al-MFIcdirect hydrothermal synthesis403.650.560.160
Cu,Al-MFId

1.14 wt.% of Zn (no Al)

direct hydrothermal synthesis→∞1.39423.60.209
eISSN:
2083-134X
Language:
English
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Journal Subjects:
Materials Sciences, other, Nanomaterials, Functional and Smart Materials, Materials Characterization and Properties
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