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Oxidation of CO in the presence of SO2 using gold supported on La2O3/TiO2 nanofibers

Paper ID Volume ID Publish Year Pages File Format Full-Text
54878 47029 2013 8 PDF Available
Title
Oxidation of CO in the presence of SO2 using gold supported on La2O3/TiO2 nanofibers
Abstract

Commercial catalysts currently available for catalytic incineration of sulfur compounds to SO2 in Claus tail gas do not engender complete oxidation of CO to CO2. This limitation thus prevents implementation of catalytic incineration in a growing number of jurisdictions which require complete CO oxidation. The aim of this study is therefore to develop a catalyst for CO oxidation which is effective in the presence of SO2 and water over a temperature range of 573–873 K, which is the typical adiabatic temperature range for Claus tail gas incineration. In this research, two Au–La2O3–TiO2 nano-catalysts have been prepared using, in one case, deposition of Au and La2O3 on TiO2 nano-materials and, in a second case, by deposition of Au on a co-precipitated TiO2–La2O3 nano-material. The synthesized catalysts were characterized using electron microscopy, X-ray photoelectron spectroscopy, powder X-ray diffraction, and infrared spectroscopy. The resulting materials showed very high CO conversion above 323 K and remained active over prolonged periods in the presence of SO2 and other sulfur compounds. The very high catalytic activity of the co-precipitated catalyst was attributed to the presence of cationic Au and a low level of sulfate formation on the nano-fiber support.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (149 K)Download as PowerPoint slideHighlights► Sol–gel synthesis of Au/La2O3/TiO2 nanofibers. ► La doping in the TiO2 anatase matrix. ► Cationic Au contributed to a higher catalytic activity for CO oxidation. ► CO oxidation achievable in the presence of SO2 and water.

Keywords
Sol–gel; La2O3/TiO2 nanofibers; Gold-doping; CO oxidation; Claus tail gas
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Oxidation of CO in the presence of SO2 using gold supported on La2O3/TiO2 nanofibers
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 207, 30 May 2013, Pages 212–219
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