Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports

›› 2009, Vol. 17 ›› Issue (5): 767-772.

Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports

方健才, 陈晓, 夏启斌, 奚红霞, 李忠

State Key Lab of Subtropical Building Science, Institute of Chemical Engineering, South China University of Technology, Guangzhou 510640, China

收稿日期:2009-01-13 修回日期:2009-08-09 出版日期:2009-10-28 发布日期:2009-10-28
通讯作者: LI Zhong,E-mail:cezhli@scut.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (20936001);the Natural Science Foundation of Guangdong Province;the State Key Lab of Subtropical Building Science,South China University of Technology (x2yjC709028Z)

Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports

FANG Jiancai, CHEN Xiao, XIA Qibin, XI Hongxia, LI Zhong

State Key Lab of Subtropical Building Science, Institute of Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Received:2009-01-13 Revised:2009-08-09 Online:2009-10-28 Published:2009-10-28
Supported by:
Supported by the National Natural Science Foundation of China (20936001);the Natural Science Foundation of Guangdong Province;the State Key Lab of Subtropical Building Science,South China University of Technology (x2yjC709028Z)

摘要/Abstract

摘要： The copper based catalysts,CuO/γ-Al₂O₃,CuO/γ-Al₂O₃-cordierite(Cord) and CuO/Cord,were prepared by impregnation method.The catalytic activity of the catalysts was tested in absence and presence of water vapor,and the catalysts were characterized.Temperature program desorption (TPD) experiments of toluene and water on the catalysts were carried out.The influence of water vapor on the activity of the catalysts was discussed.Results showed that addition of the water vapor has a significant negative effect on the catalytic activity of the catalysts.The higher the concentration of the water vapor in feed steam was,the lower the catalytic activity of the copper based catalysts became,which could be mainly ascribed to the competition of water molecules with toluene molecules for adsorption on the catalyst surfaces.TPD experiments showed that the strength of the interaction between water molecules and three catalysts followed the order:CuO/γ-Al₂O₃>CuO/γ-Al₂O₃-Cord>CuO/Cord.As a consequence of that,the degree of degradation in the catalytic activity of these three catalysts by the water vapor followed the order:CuO/γ-Al₂O₃>CuO/γ-AAl₂O₃-Cord>CuO/Cord.However,the negative effect of the water vapor was reversible.

关键词: copper based catalysts, relative humidity, toluene, catalytic combustion, water inhibition

Abstract: The copper based catalysts,CuO/γ-Al₂O₃,CuO/γ-Al₂O₃-cordierite(Cord) and CuO/Cord,were prepared by impregnation method.The catalytic activity of the catalysts was tested in absence and presence of water vapor,and the catalysts were characterized.Temperature program desorption (TPD) experiments of toluene and water on the catalysts were carried out.The influence of water vapor on the activity of the catalysts was discussed.Results showed that addition of the water vapor has a significant negative effect on the catalytic activity of the catalysts.The higher the concentration of the water vapor in feed steam was,the lower the catalytic activity of the copper based catalysts became,which could be mainly ascribed to the competition of water molecules with toluene molecules for adsorption on the catalyst surfaces.TPD experiments showed that the strength of the interaction between water molecules and three catalysts followed the order:CuO/γ-Al₂O₃>CuO/γ-Al₂O₃-Cord>CuO/Cord.As a consequence of that,the degree of degradation in the catalytic activity of these three catalysts by the water vapor followed the order:CuO/γ-Al₂O₃>CuO/γ-AAl₂O₃-Cord>CuO/Cord.However,the negative effect of the water vapor was reversible.

Key words: copper based catalysts, relative humidity, toluene, catalytic combustion, water inhibition

方健才, 陈晓, 夏启斌, 奚红霞, 李忠. Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports[J]. , 2009, 17(5): 767-772.

FANG Jiancai, CHEN Xiao, XIA Qibin, XI Hongxia, LI Zhong. Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports[J]. , 2009, 17(5): 767-772.

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Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports

Effect of Relative Humidity on Catalytic Combustion of Toluene over Copper Based Catalysts with Different Supports

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