Methane reforming reaction with carbon dioxide over SBA-15 supported Ni-Mo bimetallic catalysts |
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Authors: | Tao HuangWei Huang Jian HuangPeng Ji |
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Affiliation: | Key Laboratory of Coal Science and Technology, Ministry of Education of China and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China |
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Abstract: | A series of mesoporous molecular sieves SBA-15 supported Ni-Mo bimetallic catalysts (xMo1Ni, Ni = 12 wt.%, Mo/Ni atomic ratio = x, x = 0, 0.3, 0.5, 0.7) were prepared using co-impregnation method for carbon dioxide reforming of methane. The catalytic performance of these catalysts was investigated at 800 °C, atmospheric pressure, GHSV of 4000 ml·gcat− 1·h− 1 and a V(CH4)/(CO2) ratio of 1 without dilute gas. The result indicated that the Ni-Mo bimetallic catalysts had a little lower initial activity compared with Ni monometallic catalyst, but it kept very stable performance under the reaction conditions. In addition, the Ni-Mo bimetallic catalyst with Mo/Ni atomic ratio of 0.5 showed high activity, superior stability and the lowest carbon deposition rate (0.00073gc·gcat− 1·h− 1) in 600-h time on stream. The catalysts were characterized by power X-ray diffraction, N2-physisorption, H2-TPR, CO2-TPD, TG and TEM. The results indicate that the Ni-Mo bimetallic catalysts have smaller metal particle, higher metal dispersion, stronger basicity, metal-support interaction and Mo2C species. It is concluded that Mo species in the Ni-Mo bimetallic catalysts play important roles in reducing effectively the amount of carbon deposition, especially the amount of shell-like carbon deposition. |
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Keywords: | Methane reforming Carbon dioxide Ni-Mo bimetallic Mo2C Carbon deposition Shell-like |
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