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采用还原法和沉积-沉淀法制备了介孔Au/NiO催化剂,并运用XRD、N2吸附-脱附、UV-Vis、FTIR、和XPS等方法对其进行了表征,考察了制备方法对Au/NiO催化剂物理化学性质和丙烷氧化脱氢制丙烯反应催化性能的影响.实验结果表明Au/NiO催化剂具有一定的低温催化活性,而还原法制备的催化剂催化性能好于沉积-沉淀法制备的催化剂,反应温度350℃时,还原法制备的Au/NiO催化剂的丙烷转化率和丙烯选择性分别达到25.1%和39.8%.制备方法对表面Au的价态分布、颗粒大小及分散度均有影响.催化剂表面Auδ+物种是催化剂的主要活性组分.
The prepared Au / NiO catalysts were characterized by XRD, N2 adsorption-desorption, UV-Vis, FTIR and XPS. The effects of preparation methods on the Au / NiO catalyst and the catalytic performance of propane oxidation to propene reaction.The experimental results show that the Au / NiO catalyst has a certain low-temperature catalytic activity, while the catalytic performance of the catalyst prepared by the reduction method is better than that of the catalyst prepared by the deposition-precipitation method, The conversion of propane and selectivity to propylene of the Au / NiO catalyst prepared by the reduction method reached 25.1% and 39.8% at the reaction temperature of 350 ℃, respectively.The preparation method had an influence on the valence distribution, particle size and dispersion of the surface Au catalyst Surface Auδ + species is the main active component of the catalyst.