金属改性SBA-15应用于乙醇水蒸气重整制氢的研究

采用水热法将Ce金属引入SBA-15骨架，合成一系列Ce-SBA-15（Si/Ce=40，20，10）载体，再通过浸渍法制得Co/Ce-SBA-15催化剂.利用XRD、UV-Vis、FT-IR、H₂-TPR、N₂吸附-脱附等手段对催化剂进行表征，并用于乙醇水蒸汽重整制氢反应（ESR），考察载体骨架中Ce金属对催化剂结构和性能的影响.结果表明，水热法制备可使得Ce离子进入到SBA-15分子筛骨架，合成的载体仍保持SBA-15特有的介孔结构.与Co/SBA-15催化剂相比，基于铈的储放氧功能，Ce的加入提高了活性金属分散度，降低了反应积碳的生成，改善了催化剂稳定性.适量铈与钴的协同作用，提高了钴物种的分散度，降低了钴的烧结程度，催化剂Co/Ce-SBA-15（Si/Ce=20）具有良好的催化活性，乙醇转化率为96.6%，H₂选择性达到75.5%，反应后积碳率仅为5.6%.

The Effect of Metal Modified Mesoporous Molecular Sieve SBA-15 on Hydrogen Production by Steam Reforming of Ethanol

Ce was introduced into the SBA-15 framework by hydrothermal method to synthesize a series of Ce-SBA-15(Si/Ce=40, 20, 10) supports, and Co/Ce-SBA-15 catalysts were prepared by impregnation method. XRD, UV-Vis, FT-IR, H₂-TPR, N₂ adsorption-desorption and other means were used to characterize the catalysts, which were used in ethanol steam reforming(ESR) to investigate the influence of Ce in the supports'' framework on the structure and catalytic performance. The results showed that Ce was incorporated into the framework of SBA-15 by hydrothermal method, and the synthesized supports still maintain the unique mesoporous structure of SBA-15. Compared with the Co/SBA-15, based on the cerium metal, it has higher oxyen and relase storage capacity, the addition of cerium increases the dispersion of active metal, reduces the formation of coke and improves the stability of the catalyst. The synergistic action of moderate cerium and cobalt improves the dispersion of cobalt species and reduces the degree of cobalt sintering, Co/Ce-SBA-15 (Si/Ce=20) shows the best catalytic activity with the ethanol conversion being 96.6% and the selectivity of H₂ reaches 75.5%. Meanwhile, the carbon deposition rate after the reaction was only 5.6%.