Carbon dioxide reforming of methane over bimetallic catalysts of Pt-Ru/γ-Al2O3 for thermochemical energy storage
来源期刊：中南大学学报(英文版)2013年第5期
论文作者：杜娟 YANG Xiao-xi(杨晓西) DING Jing(丁静) WEI Xiao-lan(魏小兰) YANG Jian-ping(杨建平) WANG Wei-long(王维龙) YANG Min-lin(杨敏林)
文章页码：1307 - 1313
Key words：carbon dioxide reforming of methane; Pt-Ru/γ-Al2O3 catalysts; long-term stability; thermochemical energy storage
Abstract: The reaction of CO2 reforming of CH4 has been investigated with γ-Al2O3-supported platinum and ruthenium bimetallic catalysts, with the specific purpose of thermochemical energy storage. The catalysts were prepared by using the wetness impregnation method. The prepared catalysts were characterized by a series of physico-chemical characterization techniques such as BET surface area, thermo-gravimetric (TG), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). In addition, the amount of carbon deposits on the surface of the catalysts and the type of the carbonaceous species were discussed by TG. It was found that the bimetallic Pt-Ru/γ-Al2O3 catalysts exhibit both superior catalytic activity and remarkable stability by comparison of monometallic catalysts. During the 500 h stability test, the bimetallic catalyst showed a good performance at 800 °C in CO2 reforming of CH4, exhibiting an excellent anti-carbon performance with the mass loss of less than 8.5%. The results also indicate that CO2 and CH4 have quite stable conversions of 96.0 % and 94.0 %, respectively. Also, the selectivity of the catalysts is excellent with the products ratio of CO/H2 maintaining at 1.02. Furthermore, it was found in TEM images that the active carbonaceous species were formed during the catalytic reaction, and well-distributed dot-shaped metallic particles with a relatively uniform size of about 3 nm as well as amorphous carbon structures were observed. Combined with BET, TG, TEM tests, it is concluded that the selected bimetallic catalysts can work continuously in a stable state at the high temperature, which has a potential to be utilized for the closed-loop cycle of the solar thermochemical energy storage in future industry applications.
DU Juan(杜娟)1, YANG Xiao-xi(杨晓西)1, 2, DING Jing(丁静)3, WEI Xiao-lan(魏小兰)1, YANG Jian-ping(杨建平)1, WANG Wei-long(王维龙)3, YANG Min-lin(杨敏林)2
(1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education (South China University of Technology), Guangzhou 510640, China;
2. Key laboratory of Distributed Energy Systems of Guangdong Province,Dongguan University of Technology, Dongguan 523808, China;
3. School of Engineering, Sun Yat-sen University, Guangzhou 510006, China)
Abstract:The reaction of CO2 reforming of CH4 has been investigated with γ-Al2O3-supported platinum and ruthenium bimetallic catalysts, with the specific purpose of thermochemical energy storage. The catalysts were prepared by using the wetness impregnation method. The prepared catalysts were characterized by a series of physico-chemical characterization techniques such as BET surface area, thermo-gravimetric (TG), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS). In addition, the amount of carbon deposits on the surface of the catalysts and the type of the carbonaceous species were discussed by TG. It was found that the bimetallic Pt-Ru/γ-Al2O3 catalysts exhibit both superior catalytic activity and remarkable stability by comparison of monometallic catalysts. During the 500 h stability test, the bimetallic catalyst showed a good performance at 800 °C in CO2 reforming of CH4, exhibiting an excellent anti-carbon performance with the mass loss of less than 8.5%. The results also indicate that CO2 and CH4 have quite stable conversions of 96.0 % and 94.0 %, respectively. Also, the selectivity of the catalysts is excellent with the products ratio of CO/H2 maintaining at 1.02. Furthermore, it was found in TEM images that the active carbonaceous species were formed during the catalytic reaction, and well-distributed dot-shaped metallic particles with a relatively uniform size of about 3 nm as well as amorphous carbon structures were observed. Combined with BET, TG, TEM tests, it is concluded that the selected bimetallic catalysts can work continuously in a stable state at the high temperature, which has a potential to be utilized for the closed-loop cycle of the solar thermochemical energy storage in future industry applications.
Key words:carbon dioxide reforming of methane; Pt-Ru/γ-Al2O3 catalysts; long-term stability; thermochemical energy storage
