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Improvement in sulfur desorption of NOX storage and reduction catalysts using a Ba–Ti composite oxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
47130 46459 2011 7 PDF Available
Title
Improvement in sulfur desorption of NOX storage and reduction catalysts using a Ba–Ti composite oxide
Abstract

A Ba–Ti composite oxide was formed on a NOx storage and reduction catalyst via impregnation of a Ba–Ti precursor solution composed of H2O2 added to a complex prepared using the citric acid method. The structure of the Ba–Ti composite in solution was analyzed by chemical composition analysis and FT-Raman and UV–vis spectroscopy. MM2 calculations were performed to propose its chemical structure. Both Ba and Ti together were found to form a composite molecule in the solution. Furthermore, TEM-EDX and XRD analyses of the Ba–Ti composite oxide on the catalyst prepared by impregnation with the Ba–Ti composite aqueous solution revealed that Ba and Ti in the catalyst were highly dispersed at the nm scale. The formation of the Ba–Ti composite oxide on the NSR catalyst enhanced sulfur desorption efficiency and led to high-performance NOX conversion as a NOX storage and reduction activity catalyst after desulfation treatment. It was assumed that the existence of nano-scaled Ba compounds combined with Ti was efficient for the inhibition of the sintering of barium sulfate and its facile decomposition. It was found that dispersion of Ba compounds for NOX storage materials using a Ba–Ti complex solution is an efficient way to improve the durability of NSR catalysts.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Highly dispersed Ba–Ti composite oxide was formed using an improved complex method. ▶ The Ba–Ti composite oxide enhanced sulfur desorption efficiency. ▶ The utilization of Ba–Ti composite improved the durability of NSR catalysts.

Keywords
NSR catalyst; Desulfation; Barium sulfate; Titanium oxide; Citric acid
First Page Preview
Improvement in sulfur desorption of NOX storage and reduction catalysts using a Ba–Ti composite oxide
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 102, Issues 3–4, 22 February 2011, Pages 620–626
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis