纳米碳化钼复合物的制备及其CO加氢反应性能

Synthesis of nano-sized molybdenum carbide composite and catalytic property on CO hydrogenation reaction

利用溶胶-凝胶法成功地制备了纳米碳化钼复合物,采用热重、TEM和XRD等对合成的纳米碳化钼复合物的形貌和结构进行了表征,以CO加氢反应为探针对其催化性能进行了评价。结果表明:纳米碳化钼粒度分布均匀,包覆在无定型碳中,随着柠檬酸含量的增加粒径逐渐变小,表面Mo物种越不易被还原。用于CO加氢反应具有较高的活性,主要生成低碳烷烃,当CA/Mo=2.0时具有最高的反应活性。

Nano-sized molybdenum carbide composites could be synthesized from AHM（ （NH4）6 MoO7O24 · 6H2O） and citric acid（CA）by modified sol-gel method followed by temperature programmed carburization process. The texture property of composite was analyzed by TG,TEM and XRD, and the catalytic performance of material on CO hydrogenation reaction was evaluated. The results indicated that the particle size of molybdenum carbide was influenced as well as the tex- tural property of catalyst by the CA/Mo molar ratios. As the CA/Mo ratio increased, both particle size and lower valent molybdenum species decreased. The molybdenum carbide was highly active towards CO hydrogenation with the major prod- ucts of methane and light hydrocarbons. The CO conversion reached the maximum at the CA/Mo molar ratio 2.0.