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A Niobia-Ceria based multi-purpose catalyst for selective catalytic reduction of NOx, urea hydrolysis and soot oxidation in diesel exhaust

Paper ID Volume ID Publish Year Pages File Format Full-Text
46995 46455 2011 6 PDF Available
Title
A Niobia-Ceria based multi-purpose catalyst for selective catalytic reduction of NOx, urea hydrolysis and soot oxidation in diesel exhaust
Abstract

We report about a novel niobia-ceria based catalyst that may be applied for the selective catalytic reduction (SCR) of NOx as well as the catalytic regeneration of diesel particulate filters (DPF) in diesel engines. The material proved to be active in model gas experiments for a series of important reactions in these processes: (1) the SCR of NO with NH3, (2) the hydrolysis of urea to NH3 and (3) the oxidation of soot. The catalyst was able to convert 72% NO already at 250 °C and showed almost full NO reduction between 300 and 450 °C. The new niobia-ceria exhibited a similar urea hydrolysis activity as compared to a conventional TiO2 catalyst. A significant decrease of the soot oxidation temperature was also noticed with this catalyst.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights► A new niobia-ceria based catalyst for the SCR of NOx with NH3 is reported. ► The catalyst exhibits a similar catalytic activity compared to the conventional vanadia-based SCR catalysts. ► The niobia-ceria catalyst may simultaneously act as an excellent urea hydrolysis and a good soot oxidation catalyst.

Keywords
Selective catalytic reduction; Urea hydrolysis; Soot oxidation; Cerium oxide; Niobium oxide
First Page Preview
A Niobia-Ceria based multi-purpose catalyst for selective catalytic reduction of NOx, urea hydrolysis and soot oxidation in diesel exhaust
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 103, Issues 1–2, 14 March 2011, Pages 79–84
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis