A series of Ni–Fe/MCM-41 bimetallic catalysts and also Ni/MCM-41 and Fe/MCM-41 catalysts were prepared by the incipient-wetness impregnation method and tested for their activity for CO methanation in a continuous-flow microreactor. The results showed that the catalytic activities of the Ni–Fe/MCM-41 bimetallic catalysts were much higher than those of the Ni/MCM-41 and Fe/MCM-41 catalysts at low temperatures (200°C–325°C). The 10%Ni–5%Fe/MCM-41 catalyst showed the best activity with a CO conversion of almost 100% and a CH4 selectivity of 98% at 350°C under a pressure of 1.5 MPa with a 3:1 molar ratio of H2 to CO and a weight hourly space velocity of 12,000 mL h−1 g−1. The catalysts were characterized by N2 physisorption measurements, X-ray diffraction, and H2-temperature-programmed reduction. The results showed that the addition of Fe will lead to the formation of finer Ni particles and Ni–Fe alloy, which were the main reasons for the activity increase in the Ni–Fe/MCM-41 catalysts.

中文翻译：

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双金属Ni-Fe/MCM-41催化剂的制备及其对CO甲烷化的催化活性

通过初湿浸渍法制备了一系列 Ni-Fe/MCM-41 双金属催化剂以及 Ni/MCM-41 和 Fe/MCM-41 催化剂，并在连续流动微反应器中测试了它们对 CO 甲烷化的活性。结果表明，Ni-Fe/MCM-41双金属催化剂在低温（200°C-325°C）下的催化活性远高于Ni/MCM-41和Fe/MCM-41催化剂。10%Ni–5%Fe/MCM-41 催化剂表现出最好的活性，CO 转化率几乎为 100%，CH4 选择性为 98%，在 350°C 和 1.5 MPa 的压力下，摩尔比为 3:1 H2 到 CO 和 12,000 mL h-1 g-1 的重时空速。催化剂的特征在于 N2 物理吸附测量、X 射线衍射和 H2 程序升温还原。