碳化终温对碳化钼的制备及甲烷二氧化碳重整催化性能的影响

以MoO3为前驱物, 于20%CH4-80%H2的混合气体(100 mL/min)中, 在不同设定终温下进行碳化, 制备了一系列不同碳化终温的Mo2C, 通过XRD和XPS等手段进行了表征, 并对其甲烷二氧化碳重整(DMR)制备合成气的催化性能进行评价, 讨论了碳化终温作为Mo2C的制备参数, 与所制备的Mo2C体相、表面特征和催化剂性能的关系. 结果表明, 碳化终温在700 ℃以上制得的Mo2C催化剂晶相为较纯的β-Mo2C, 随着碳化终温的升高, 催化剂碳化程度不断提高, 表面的自由碳不断增多, 碳化终温为800 ℃时为最佳, 所制备的Mo2C催化剂碳化程度较高, 表现出最佳的催化性能, 同时催化剂表面自由碳较为适量, 促进了Mo2C催化剂的碳化和氧化平衡, 有利于催化剂的活性和稳定性.

Effect of Carburization Temperature on the Preparation and the Catalytic Performance of Molybdenum Carbide in the Dry-methane Reforming(DMR)

A series of molybdenum carbide catalysts were prepared using 20%CH4-H2 to carburize molybdenum trioxide at different temperatures. The catalysts were characterized using X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS) and N2-adsorption. Their catalytic performance was evaluated in the model reaction of the dry-methane reforming(DMR) to synthesis gas. Here,the characteration of bulk and surface Mo2C catalysts and its influence on the catalytic performance were described. The results show that th...