程序升温表面反应技术研究氧化铈上H2S的吸附和转化

采用程序升温表面反应技术研究了H2S在CeO2,TiO2和Al2O3三种载体上的吸附和反应行为.结果表明,CeO2具有最强的脱硫能力.系统研究了预处理气氛对H2S在CeO2上吸附和反应行为.发现CeO2的脱硫能力在惰性气氛、还原性气氛、氧化性气氛中依次增强.H2S首先吸附在经预处理的CeO2表面,进一步在Ar氛围下升温脱附时,一部分H2S在673K以下脱附,部分则与CeO2表面氧反应,在473K下产生硫和水,而在473～673K温度范围内,生成SO2.在673K以上,所生成的SO2进一步与晶格氧反应,转化成硫酸盐.后者在873K再次分解为SO2.因此,CeO2表面脱硫过程应控制在673K以下,...

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Bibliographic Details
Published in催化学报 Vol. 33; no. 10; pp. 1631 - 1635
Main Author 刘冰 徐恒泳 张泽会
Format Journal Article
LanguageChinese
Published 中国科学院大连化学物理研究所,辽宁大连116023%中国科学院大连化学物理研究所,辽宁大连,116023%中南民族大学催化材料教育部-国家民委共建重点实验室,湖北武汉,430074 2012
中南民族大学催化材料教育部-国家民委共建重点实验室,湖北武汉430074
Subjects
吸附
氧化铈
硫化氢
程序升温表面反应
temperature-programmed surface reaction
adsorption
hydrogen sulfide
吸附
程序升温表面反应
氧化铈
硫化氢
ceria
Online AccessGet full text
ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(11)60416-6

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Summary:采用程序升温表面反应技术研究了H2S在CeO2,TiO2和Al2O3三种载体上的吸附和反应行为.结果表明,CeO2具有最强的脱硫能力.系统研究了预处理气氛对H2S在CeO2上吸附和反应行为.发现CeO2的脱硫能力在惰性气氛、还原性气氛、氧化性气氛中依次增强.H2S首先吸附在经预处理的CeO2表面,进一步在Ar氛围下升温脱附时,一部分H2S在673K以下脱附,部分则与CeO2表面氧反应,在473K下产生硫和水,而在473～673K温度范围内,生成SO2.在673K以上,所生成的SO2进一步与晶格氧反应,转化成硫酸盐.后者在873K再次分解为SO2.因此,CeO2表面脱硫过程应控制在673K以下,可避免复杂的再生过程.
Bibliography:LIU Bing1,2,XU Hengyong2,a,ZHANG Zehui1,b 1 Key Laboratory of Catalysis and Materials Sciences of the State Ethnic Affairs Commission ＆ Ministry of Education,College of Chemistry and Material Science,South-Central University for Nationalities,Wuhan 430074,Hubei,China 2 Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China
ceria; hydrogen sulfide; adsorption; temperature-programmed surface reaction
H2S adsorption and reaction on CeO2,TiO2,and γ-Al2O3 were studied by temperature programmed surface reaction（TPSR）.Ceria had the best desulfidation ability.The pretreatment atmosphere affected H2S adsorption and reaction on ceria,and desulfidation efficiency increased in the order of inert atmosphere,reducing atmosphere,oxidizing atmosphere.H2S was first adsorbed on pretreated ceria at room temperature.On increasing the temperature in an Ar（99.99%） atmosphere,part of the H2S desorbed below 673 K,and another part reacted with the surface oxygen on ceria to produce sulfur and wate
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(11)60416-6