对不同碳化终温和经过H2、CO2预处理的Mo2C/Al2O3催化剂进行了POM催化活性评价与结构表征。结果表明，高碳化终温的Mo2C/Al2O3催化剂对于POM反应制合成气有高的甲烷转化率，CO和H2选择性，在580℃时H2预处理比CO2预处理的催化剂具有好的甲烷转化率和好的CO、H2选择性，但H2预处理时间过长会使CO和H2的选择性有所降低，CO2预处理会导致低的甲烷转化率和极低的CO和H2的选择性，XRD结果表明，在700～850℃之间碳化的样品均为β-Mo2C, BET比表面的测定结果表明随碳化终温的增加，Mo2C/Al2O3催化剂的比表面有所增加。

A series of Na-W-Mn/SiO2 catalysts with different sodium, tungsten, and manganese contents (wt.%) were prepared and their catalytic performance for the oxidative coupling of methane (OCM) was evaluated in a continuous micro-reactor. The structural properties of the catalysts have been characterised using XPS, laser Raman spectroscopy (LRS), and X-ray diffraction (XRD). The results show that the catalysts containing Na, W, and Mn between the range of 0.4-2.3, 2.2-8.9, and 0.5-3.0 wt.%, respectively, had high CH4 conversion and high selectivity to C2 hydrocarbons in the OCM reaction. The addition of sodium to the catalyst is believed to bring about the migration of manganese to the catalyst surface, as both elements are found in high concentrations in this area. CH4 conversion and the selectivity to C2H4 are closely related to the surface Mn concentration of the catalysts. Both Na-O-Mn and Na-O-W act as the active centres of the catalysts for the oxidative coupling of methane. The catalyst surface is mainly covered with Na and O, while the Mn and W are present in the sub-surface of the catalyst. There is a synergic effect of sodium, tungsten, and manganese components, and the Na2W2O7 crystalline phase is active for the oxidative coupling of methane.

制备了多组分Na、W、Mn/SiO2催化剂，在ITD（Ion Trap Detector）装置上进行了催化剂表面晶格氧脱附前后的甲烷恒温脉冲反应（CH4-CTPR）。研究结果表明，Na-W/SiO2催化剂表面晶格氧，具有较高的CH4转化率和C2烃选择性，并对C2H6 的生成起着重要的作用；Na-M n/SiO2催化剂表面晶格氧，也具有较高的CH4转化率和C2烃选择性，但对C2H6 的形成有一定的诱导期；W-M n/SiO2催化剂表面晶格氧，对CH4的转化和CO2的生成具有很高初活性，但对C2烃的选择性较低；Na-W-M n/SiO2催化剂表面晶格氧，具有很高的CH4转化率和C2烃定向选择性，这是由于Na、W、M n各组分协同作用的结果

过渡金属碳化物作为一种催化新材料显示了其独特的性能，在石油馏份的HDS、HDN、加氢和脱氢反应、烃的异构化和芳构化、甲烷转化、F-T合成和电催化等反应中都表现出了优良的催化性能。本文综述了国内外关于钼、钨碳化物的制备方法以及在上述反应中的应用研究进展。

Na-W-Mn/SiO2 catalysts with different sodium contents (wt%) were prepared and used for the oxidative coupling of methane (OCM). The catab, sts were characterized bv XPS and XRD. It was found that the catalysts with sodium contents between 0.39wt% and 2.34wt% exhibited good catalytic performances and the crystalline phases of the manganese oxides which lhvoured the reaction were formed. Owing to the addition of Na to the WO4-Mn/SiO2 catalyst, W and Mn moved towards the surface. These resuks suggested that the sodium is an essential active component for a high CH4 conversion and a high C2H4 selectivity.