Novel promoting effects of cerium on the activities of NOx reduction by NH3 over TiO2-SiO2-WO3 monolith catalysts

A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly en...

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Published inJournal of rare earths Vol. 32; no. 10; pp. 952 - 959
Main Author 房志涛 林涛 徐海迪 吴干学 孙萌萌 陈耀强
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2014
Subjects
CeO2/TiO2-SiO2-WO3
cerium
monolith catalyst
NH3
NH3-SCR
NOx还原
rare earths
SEM-EDS
TiO2-SiO2
X射线光电子能谱
掺杂氧化铈
整体催化剂
选择性催化还原
NO
NH3-SCR
CeO2/TiO2-SiO2-WO3
monolith catalyst
cerium
rare earths
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ISSN1002-0721
2509-4963
DOI10.1016/S1002-0721(14)60168-X

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Summary:A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2.
Bibliography:A series of catalysts were prepared by doping different loadings of CeO2 over TiO2-SiO2-WO3 and used for the selective catalytic reduction of NOx by NH3. The experimental results showed that the selective catalytic reduction（SCR） performance and SO2-resistant ability of TiO2-SiO2-WO3 were greatly enhanced by the introduction of cerium. The catalyst containing 10% CeO2 showed the highest NO conversion in a wide temperature range and good N2 selectivity with broad operation temperature window at the gas hourly space velocity（GHSV） of 30000 h–1, which was a very promising catalyst for NOx abatement from diesel engine exhaust. The catalysts were characterized by X-ray diffraction（XRD）, scanning electron microscopy with energy dispersive X-ray spectroscopy（SEM-EDS）, N2 adsorption-desorption（BET） and X-ray photoelectron spectroscopy（XPS）. The characterization results showed that the bigger pore radius, higher surface atomic concentration and dispersion of Ce and the abundant adsorbed oxygen on the surface of catalyst contributed to the best NH3-SCR performance of CeO2/TiO2-SiO2-WO3 catalyst containing 10% CeO2.
FANG Zhitao , LIN Tao, XU Haidi , wg Ganxue , SUN Mengmeng , CHEN Yaoqiang（ Key Laboratory of Green Chemistry ＆ Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China, Center of Engineering of Vehicular Exhaust Gases Abatement, Chengdu 610064, China; Center of Engineering of Environmental Catalytic Material, Chengdu 610064 China）
11-2788/TF
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60168-X