中文摘要：

采用浸渍法分别以MCM-41，Al2O3和SiO2为载体制备了不同镍负载量的甲烷化催化剂，并在连续流动固定床反应装置上对其甲烷化催化活性进行了评价。研究结果表明，与Ni／Al2O3和Ni／SiO2相比，相同镍负载量的Ni／MCM-41催化剂具有更好的催化活性。同时研宄了Ni含量对于Ni／MCMO41催化剂催化活性的影响，发现随着Ni含量的增加，CO转化率和CH。收率逐渐升高，并且在Ni含量大于10％（质量分数）以后趋于稳定。在n（H2）：n（C0）=3：1、反应压力1．5MPa、反应温度350℃及质量空速12000ml·h^-1·g^-1的反应条件下，10％Ni／MCM-41催化剂CH4选择性达到94．9％，CO转化率接近100％。在100h催化活性稳定性试验中，10％Ni／MCM-41催化活性无明显下降，表现出良好的催化活性稳定性。采用X射线衍射（XRD）、氮气物理吸附（BET）、热重分析fTG）及氢气程序升温还原（H2-TPR）等技术手段对催化剂进行了表征，结果表明Ni颗粒大小是影响Ni／MCM-41催化剂催化活性的主要因素。

英文摘要：

Nickel based catalysts with different nickel contents were prepared by the impregnation method with MCM-41, A1203 and SiO2 as supports, and catalytic performance was studied in a fixed-bed reactor for the production of synthetic natural gas （SNG）. Compared with the Ni/A1203 and Ni/SiO2 catalysts, Ni/MCM-41 catalysts with the same nickel content of 10%（mass） showed better catalytic performance with high CO conversion of 100% and CH4yield of 94.9% at 350℃ under 1.5 MPa with 3：1 molar ratio of H2 to CO and a weight hourly space velocity （WHSV） of 12000 ml ·h^-1·g^-1. The effect of Ni loading on catalytic performance of Ni/MCM-41 catalysts was also investigated. Catalytic activity increased with increasing Ni loading and kept stable with Ni loading of above 10%（mass）. 10% Ni/MCM-41 catalyst also exhibited excellent catalytic activity and stability in the catalytic stability test. The catalysts were characterized with X-ray diffraction （XRD）, N2 physisorption measurements, thermo gravimetric analysis （TG） and H2 temperature-programmed reduction （H2-TPR）. Ni particle size could obviously affect the catalytic performance of Ni/MCM-41 catalysts. Ni/MCM-41 catalyst with 10%（mass） nickel content and appropriate nickel particles of 15.5 nm exhibited good catalytic performance with almost 100% CO conversion and 94.9% CH4 yield.