In:
ChemCatChem, Wiley, Vol. 14, No. 18 ( 2022-09-20)
Abstract:
Nanosized Cu‐containing ZSM‐5 catalysts with different n (Si)/ n (Al) ratio of 18.9–50.5 were prepared by ion‐exchange. The physico‐chemical characterization clearly shows that the molar ratio of framework T atoms influences the nature and distribution of copper species. According to DR UV‐Vis, TPR‐H 2 , EPR, or FT‐IR spectroscopy analyses, the amount of aggregated copper species increases with increasing the framework n (Si)/ n (Al) ratio. Thus, the activity of the Cu‐containing ZSM‐5 with n (Si)/ n (Al) ratio of 47.0—50.5 in the selective catalytic NO reduction with NH 3 (NH 3 ‐SCR‐DeNO x ) significantly decreases compared to the other materials ( n (Si)/ n (Al) ratio of 18.9—19.6). The reaction mechanism has been discussed in light of the results of 2D COS (two‐dimensional correlation spectroscopy) analysis of IR spectra and catalytic properties of the zeolites. The results make evident that enhanced activity of Cu‐containing ZSM‐5 in NH 3 ‐SCR‐DeNO x is correlated with the formation of different NO x − under the experimental conditions.
Type of Medium:
Online Resource
ISSN:
1867-3880
,
1867-3899
DOI:
10.1002/cctc.202200627
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2501161-3
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