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Enhanced alkali resistance of CeO2/SO42 −–ZrO2 catalyst in selective catalytic reduction of NOx by ammonia

Paper ID Volume ID Publish Year Pages File Format Full-Text
50446 46794 2014 4 PDF Available
Title
Enhanced alkali resistance of CeO2/SO42 −–ZrO2 catalyst in selective catalytic reduction of NOx by ammonia
Abstract

•Ceria supported on sulfated zirconia has a remarkable resistance to alkali poisons.•Sulfation treatment of supports greatly enhances the surface acidity.•Adequate acidity leads to higher SCR activity and resistance to potassium poisons.•Introduced potassium could result in a higher surface area of catalysts.

Ceria catalysts supported on sulfated zirconia showed a remarkable resistance towards alkali metal poisoning in selective catalytic reduction of NO by NH3. TPD results revealed sulfation treatment of supports produced massive acid sites on the surface of catalysts. Adequate acidity was of importance for the enhanced resistance to alkali metal ions. The introduction of potassium did not affect the crystalline phases and morphology of catalysts, but it could lead to higher surface areas of samples.

Keywords
Potassium; Ceria; Sulfated zirconia; Acidity; NO; SCR
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Enhanced alkali resistance of CeO2/SO42 −–ZrO2 catalyst in selective catalytic reduction of NOx by ammonia
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 43, 5 January 2014, Pages 223–226
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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