MgO在WO3/SiO2催化1-丁烯自歧化反应中的作用研究

he effect of MgO in 1-butene self-metathesis reaction was studied here in a catalystic system together with WO3/SiO2. The reaction of 1-butene on WO3/SiO2, MgO, as well as WO3/SiO2 mixed with MgO catalysts was studied first. The results show the existence of 2-butene is the key to produce propene, confirming the isomerization effect of MgO. After the common pre-treatment of single WO3/SiO2 catalyst and WO3/SiO2 mixed with MgO catalysts, the two kinds of WO3/SiO2 catalysts (with or without MgO catalyst) were characterized in acidity, surface structures and reduction degree. It exhibits that MgO can obviously reduce the surface acidity of WO3/SiO2, increase the reduction degree of surface WOx, while it is bad for the generation of surface tetrahedral species. This work provides a theoretical and experimental support for developing a high-performance metathesis catalyst.