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Cooperative effect of Pt–Rh/Ba/Al and CuZSM-5 catalysts for NOx reduction during periodic lean-rich atmosphere

Paper ID Volume ID Publish Year Pages File Format Full-Text
51605 46848 2008 5 PDF Available
Title
Cooperative effect of Pt–Rh/Ba/Al and CuZSM-5 catalysts for NOx reduction during periodic lean-rich atmosphere
Abstract

NOx removal efficiency was investigated with a combination of model Pt–Rh/Ba/Al and Cu-ZSM-5 catalysts using periodic fluctuations between lean (100 s) and rich (10 s) atmosphere. NOx removal is greatly improved at 250 °C and 300 °C by physically mixing the two catalysts. The mixed catalyst shows a NOx removal activity almost double as compared to a system where Pt–Rh/Ba/Al catalyst is situated upstream and CuZSM-5 downstream the gas flow. FT-IR characterisation shows that CuZSM-5 catalyst enhances the formation of NCO species on alumina during rich conditions. These NCO are further hydrolyzed to NH3 under lean condition which acts as a reductant for NOx.

Keywords
NSR; NH3-SCR; Pt–Rh/Ba/Al; NOx reduction; NH3; Isocyanate; Cu; ZSM-5
First Page Preview
Cooperative effect of Pt–Rh/Ba/Al and CuZSM-5 catalysts for NOx reduction during periodic lean-rich atmosphere
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 2, 15 November 2008, Pages 137–141
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis