介孔Cr-MSU-1的合成、表征及催化性能

Synthesis, Characterization and Catalytic Activity of Mesoporous Cr-MSU-1

以Na2SiO3为硅源,非离子型表面活性剂脂肪醇聚氧乙烯醚A(EO)9为模板剂合成了介孔Cr-MSU-1,并通过XRD、HRTEM、N2吸附-脱附、FT-IR和DRUV-Vis等手段对其进行了表征.结果表明,Cr进入了介孔MSU-1骨架中,并大部分以四配位的Cr(VI)形式存在.将Cr-MSU-1作为催化剂用于CO2氧化乙烷脱氢反应,表现出了良好的催化活性,650℃下乙烷的转化率和乙烯的选择性分别为31.7%和96.1%.

Mesoporous Cr-MSU-1 was successfully prepared by using sodium silicate, chromium nitrate, fatty alcohol polyoxyethylene ether （A（EO）9） as the source of silicone, metal and mesostructure-directing agent, respectively. Cr-MSU-1 and MSU-1 were comparatively characterized by XRD, HRTEM, N2 adsorption-desorption, FT-IR and DR UV-Vis techniques. No obvious differences on structural and textural properties between them were observed from XRD patterns and N2 adsorption-desorption isotherms. The HRTEM image confirmed that Cr-MSU-1 took on wormlike mesostructure that was similar to MSU-1. In the VF-IR patterns, the introduction of Cr showed slight influence to adsorption bands of MSU-1 which indicated that Cr was incorporated into the framework of MSU-1. It is suggested from the DR UV-Vis spectra that Cr species mostly formed Cr（Ⅵ） in tetrahedral coordination in Cr-MSU-1. The Cr-MSU-1 catalyst performs well in the dehydrogenation of ethane with CO2, resulting in the production of ethylene with a conversion of 31.7% and a selectivity of 96.1% at 650℃.