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Ceria–zirconia-supported rhodium catalyst for NOx reduction from coal combustion flue gases

Paper ID Volume ID Publish Year Pages File Format Full-Text
47662 46479 2009 10 PDF Available
Title
Ceria–zirconia-supported rhodium catalyst for NOx reduction from coal combustion flue gases
Abstract

The catalytic activities of ceria–zirconia mixed oxides CexZr1−xO2 (x = 0.17, 0.62 and 0.8) rhodium catalysts were determined by isothermal steady-state experiments using a representative mixture of exhaust gases of coal combustion. Results show that all supports are active in deNOx reaction in the presence of the mentioned gas mixture. However, their catalytic activity varies with the content of cerium and goes through a maximum for x = 0.62, leading to 27% NOx consumption. The effect of rhodium on Ce0.62Zr0.38O2 considerably improves the catalytic activity during the deNOx process assisted by hydrocarbons. The rhodium addition decreases by about 34 °C the temperature of NOx consumption, which goes up to 57%. A mechanism of hydrocarbon (HC) assisted reduction of NO is proposed on ceria–zirconia-supported rhodium catalysts. This mechanism is divided in three catalytic cycles involving (i) the oxidation of NO into NO2, (ii) the reaction of NO2 and the hydrocarbons leading to RNOx species and CxHyOz, and finally (iii) the decomposition of NO assisted by these latter CxHyOz species.

Keywords
Lean deNOx of coal; Ceria–zirconia; Rhodium; Mechanism
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Ceria–zirconia-supported rhodium catalyst for NOx reduction from coal combustion flue gases
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 90, Issues 3–4, 17 August 2009, Pages 535–544
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us