Carbon dioxide reforming of methane over nickel catalysts supported on mesoporous MgO
Carbon dioxide reforming of methane over nickel catalysts supported on mesoporous MgO
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DOI：
10.1007/s10934-013-9766-3
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发表时间：
2014-04
影响因子：
2.6
通讯作者：
Lin Li;Luming Zhang;Xiaofeng Shi;Yuhua Zhang;Jinlin Li
中科院分区：
文献类型：
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作者：
Lin Li;Luming Zhang;Xiaofeng Shi;Yuhua Zhang;Jinlin Li
本文合成了有序介孔MgO纳米晶[MgO（M）]，并采用浸渍法制备了MgO（M）负载的镍催化剂。制备的Ni/MgO（M）催化剂具有良好的织构性能，并将其作为甲烷二氧化碳重整反应的催化剂进行了研究。结果表明，与Ni/MgO（C）催化剂[MgO（C）：商品MgO]相比，MgO（M）的介孔结构可以有效地抑制活性金属的生长，Ni/MgO（M）催化剂对该反应表现出较高的催化活性和较长的催化稳定性。结果表明，在650 °C下反应100 h后，CH 4和CO2的转化率仅下降<5%.催化性能的提高与介孔材料的大比表面积、均匀的孔径等结构特性以及“限制效应”对Ni活性中心的稳定作用密切相关。采用TG和拉曼光谱对Ni/MgO（M）催化剂上的碳物种进行了分析，结果表明，反应100 h后，Ni/MgO（M）催化剂上的碳物种主要为活性碳物种。
In this paper, ordered mesoporous MgO nanocrystals [MgO(M)] were synthesized, and the nickel catalysts supported on MgO(M) were facilely prepared by impregnation method. The obtained Ni/MgO(M) catalysts with advantageous textural properties were investigated as the catalysts for the carbon dioxide reforming of methane reaction. It was found that compared with the Ni/MgO(C) catalyst [MgO(C): commercial MgO], the mesoporous pore structure of MgO(M) could effectively limit the growth of the activity metal, and the Ni/MgO(M) catalysts showed high catalytic activities as well as long catalytic stabilities toward this reaction. The results showed that the conversions of CH4and CO2were only decreased <5 % after 100 h of reaction at 650 °C. The improved catalytic performance was suggested to be closely associated with both the advantageous structural properties, such as large specific surface area, uniform pore size, and the “confinement effect” of the mesoporous matrixes contributed to stabilize the Ni active sites during the reaction. The carbon species deposited on the spent Ni/MgO(M) catalyst were analysized by TG and Raman, and the results exhibited that the carbon species after 100 h of reaction were mainly active carbon species.