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Influence of CO2 Reforming of CH4 Reaction Performance by Adding Vapor on Ni/CeO2-ZrO2-Al2O3 Catalyst
Li Chunlin1, Fu Yilu*1, Meng Ming1, Bian Guozhu1, Xie Yaning2, Hu Tiandou2, Zhang Jing2
1.Department of Chemical Physics,University of Science and Technology of China,Hefei 230026;2.Institute of High Energy Physics,Chinese Academy of Science,Beijing 100039
Abstract:
The Ni/CeO2 -ZrO2 -Al2O3 catalyst was prepared with the hydrothermal method. The catalytic performance for the CO2 reforming of CH4 reaction with or without small amount of steam was tested and the amount of coke deposition was measured. The XAFS of Ni K-edge was attained. The results show that the formation of CeAlO3 occurs in reaction,but the coke deposition is responsible for the deactivation of the catalyst. The addition of steam into feed gas can decrease the amount of coke deposition,and promote the stability. Due to the carbon atom penetration into the Ni lattice,for the catalyst sample after reaction without the addition of steam into feed gas,the coordination number of the first Ni-Ni shell decreases sharply. For the catalyst sample after reaction with the addition of steam in feed gas,the coordination numbers of the first Ni-Ni shell decrease slightly. It is due to the addition of steam into feed gas,which can suppress the coke formation and maintain the metallic structure of active Ni metal.
Key words:  CO2 reforming of CH4 reaction,Steam addition,Ni / CeO2 -ZrO2 -Al2O3 catalyst,XAFS,Coke deposit
FundProject:
附件
水蒸汽对Ni/CeO2-ZrO2-Al2O3催化剂上CO2+CH4重整反应的影响
李春林1, 伏义路*1, 孟明1, 卞国柱1, 谢亚宁2, 胡天斗2, 张静2
1.中国科学技术大学化学物理系,合肥 230026;2.中国科学院高能物理研究所,北京 100039
摘要:
采用水热合成法制备了Ni/CeO2-ZrO2-Al2O3催化剂. 进行了添加和不添加水蒸汽的CH4+CO2催化重整反应,测试了活性和稳定性,测量了积碳量,并用XAFS 手段测试了催化剂Ni 的K 吸收边. 结果表明,在反应过程中有CeAlO3的生成,但积碳是无水蒸汽添加的反应活性降低的原因. 反应气中添加水蒸汽能够减少积碳,从而提高催化反应的稳定性. 由于碳原子插入Ni 晶格,无水蒸汽反应后的最近邻Ni-Ni 配位数有较大幅度的减少. 添加了水蒸汽的反应,最近邻Ni-Ni 配位数比反应前减少幅度小,这主要
关键词:  CO2+CH4重整反应  添加水蒸汽  Ni/CeO2-ZrO2-Al2O3
DOI:10.1088/1674-0068/17/1/95-99
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