NDLI: Fourier Transform IR Study of NO + CH4 + O2 Coadsorption on In-ZSM-5 DeNOx Catalyst

Content Provider	Springer Nature Link
Author	Beltramone, Andrea R. Pierella, Liliana B. Requejo, Felix G. Anunziata, Oscar A.
Copyright Year	2003
Abstract	Reactivity of the NO and NO2 adspecies in the coadsorption of NO with CH4 and O2, and the effect of Si/Al ratio of In-ZSM-5 were studied by FTIR in situ. The relation between the adsorbed species and catalytic activity in the SCR of NOx to N2 was also investigated. The adsorption of NO over this catalyst was performed at room temperature with pure NO followed by purging with vacuum. When NO was introduced to the samples, three peaks were observed by FTIR: 1622 and 1575 cm-1, which can be assigned to adsorbed (ONO)- over InO+ site and NO2 over InO+ site, respectively, and at 1680 cm-1 corresponding to NO3 --H. Coadsorption of nitrogen monoxide, methane and oxygen at room temperature of the samples with Si/Al ratio of 17(a), 27(b) and 50(c), allowed us to determine that sample (b) has large amount of NO2–InO+ adsorbed species, which are the most important intermediates in the SCR of NOx. The bands at 1575 and 1680 cm-1 are more intense in samples (a) and (c). When the coadsorption of the mixture was performed at 400 °C, we can see that the adsorbed species are larger in sample (b). Taking into account the catalytic performance of the catalysts and the PAC results obtained by us earlier, this last indium specie, only present in the sample with Si/Al = 27, should be associated with the catalytic active specie for the SCR of NOx.
Starting Page	19
Ending Page	24
Page Count	6
File Format	PDF
ISSN	1011372X
Journal	Catalysis Letters
Volume Number	91
Issue Number	1-2
e-ISSN	1572879X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2003-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Pharmacy
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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