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担载型Mn_2O_3-Na_2WO_4/SiO_2催化剂具有优异的甲烷氧化偶联制乙烯催化活性。在最佳反应条件下,甲烷转化率和C_2烃收率分别达到37.1％和23.9％;在1000 h连续操作后性能基本维持不变;并且由于它适于流化床操作,对这类强放热反应的工业化较为有利,本文报导用XRD、XPS和PASCA(化学分析正电子湮没谱)方法研究该催化剂活性组分Na_2WO_4和Mn_2O_3在SiO_2载体上的分散状态和氧化物/担体相互作用的结果。 催化剂由混浆法和浸渍法制备,并经750—850℃焙烧。系列配比的催化剂均经AAS分析证实体相组成。催化剂比表面积用Sorptmaeic—1822型比表面积测定仪测定(N_2吸附,
The supported Mn_2O_3-Na_2WO_4 / SiO_2 catalyst has excellent catalytic activity for methane oxidation. Under the optimal reaction conditions, methane conversion and C 2 hydrocarbon yield reached 37.1% and 23.9%, respectively. The performance remained unchanged after 1000 hours of continuous operation. Because of its suitability for fluidized bed operation, The industrialization of thermal reaction is more favorable. The results of XRD, XPS and PASCA (chemical analysis of positron annihilation spectroscopy) methods were used to study the dispersion state and the oxide / support interaction of the active components Na_2WO_4 and Mn_2O_3 on SiO_2 support. The catalyst is prepared by the mixing and impregnation process and calcined at 750-850 ° C. A series of catalysts were confirmed by AAS analysis of the bulk composition. The specific surface area of the catalyst was measured by Sorptmaeic-1822 surface area analyzer (N2 adsorption,