The effect of lanthanum addition on the catalytic activity of γ-alumina supported bimetallic Co–Mo carbides for dry methane reforming
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- 作者：Liam J. France (1)
Xian Du (1)
Naif Almuqati (1)
Vladimir L. Kuznetsov (1)
Yongxiang Zhao (2)
Jiang Zheng (1)
Tiancun Xiao (1)
Abdulaziz Bagabas (3)
Hamid Almegren (3)
Peter P. Edwards (1) - 关键词：Dry methane reforming ; Bimetallic carbide ; Lanthanum ; Carbon dioxide
- 刊名：Applied Petrochemical Research
- 出版年：2014
- 出版时间：May 2014
- 年：2014
- 卷：4
- 期：1
- 页码：145-156
- 全文大小：
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Xian Du (1)
Naif Almuqati (1)
Vladimir L. Kuznetsov (1)
Yongxiang Zhao (2)
Jiang Zheng (1)
Tiancun Xiao (1)
Abdulaziz Bagabas (3)
Hamid Almegren (3)
Peter P. Edwards (1)
1. Department of Chemistry, University of Oxford, South Parks Rd, Oxford, OX1 3QR, UK
2. School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China
3. Petrochemical Research Institute, King Abdulaziz City of Science and Technology (KASCT), King Abdullah Rd, Riyadh, 11442, Saudi Arabia - ISSN：2190-5533
文摘
The effect of lanthanum addition to γ-alumina supported bimetallic carbides has been studied for the reaction of dry methane reforming using four different lanthanum loading levels of 1, 5, 10 and 15?wt% of lanthanum. It has been demonstrated that the addition of lanthanum to supported bimetallic carbides at low loading levels (1?wt%) results in smaller carbide crystallite sizes compared to catalysts containing either no lanthanum or higher lanthanum loading levels (5-5?wt%). Increased lanthanum loading results in increased carbon dioxide desorption at 500-00?°C. Reactions indicated that increased lanthanum loading resulted in significantly reduced product yields due to increased reverse water–gas shift activity. All materials exhibited degrees of sintering during the reaction. It was found that cobalt reacted with lanthanum species to form a LaCoO3 phase. The 1?wt% catalyst possessed superior catalytic properties for dry methane reforming and was tested for 100?h. After an initial loss of activity, the catalyst appeared to stabilise, however, a decrease of ~3?% in the H2:CO ratio, evidence of carbide crystallite growth and carbon deposition, indicated that a shift in the side reactions had occurred during the reaction.