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Investigation of the nature of silver species on different Ag-containing NOx reduction catalysts: On the effect of the support

Paper ID Volume ID Publish Year Pages File Format Full-Text
45925 46427 2014 14 PDF Available
Title
Investigation of the nature of silver species on different Ag-containing NOx reduction catalysts: On the effect of the support
Abstract

•Ag was supported on Al2O3, ceria zirconia, sulphated ceria zirconia and MFI zeolite.•Each support stabilizes specific Ag species with different activity for NOx SCR.•Possible redox cycles occurring during NOx SCR between Ag species were discussed.

Silver species present in four different Ag-based catalysts, with different supports (Al2O3, ceria–zirconia, sulphated ceria–zirconia and MFI zeolite), were identified by a combination of different characterization techniques (Powder XRD, Raman Spectroscopy, TEM, H2-TPR, DRS UV–Vis Spectroscopy, CO adsorption followed by DRIFTS and pyridine adsorption followed by FTIR), each one allowing to obtain information on specific Ag species. While Powder XRD and Raman gave structural information on the Ag species present on the catalysts, complementary information on their relative reducibility and electronic state was obtained by H2-TPR, DRS UV–Vis and CO adsorption followed by DRIFTS.The possibility of different redox cycles occurring during the NOx SCR reaction between the silver species present in each catalyst was discussed.

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Keywords
Silver; Alumina; Ceria–zirconia; ZSM-5 zeolite; SCR
First Page Preview
Investigation of the nature of silver species on different Ag-containing NOx reduction catalysts: On the effect of the support
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 150–151, 5 May 2014, Pages 204–217
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis