MoO3/SiO2催化甘油脱水氢转移还原制备烯丙醇

采用浸渍法制备了MoO3/SiO2催化剂,采用粉末X射线衍射、扫描电子显微镜、氮气吸附-脱附、NH3程序升温脱附及吸附吡啶傅里叶变换红外光谱等手段对催化剂进行了表征,并在固定床反应器中考察了催化剂负载量、反应温度、甘油浓度、空速等条件对MoO3/SiO2催化甘油制备烯丙醇反应性能的影响.结果表明,在MoO3的负载量(质量分数)为1%,330℃、常压、40%(质量分数)甘油水溶液和空速为200 h-1的反应条件下,甘油转化率、烯丙醇选择性及时空收率分别可达92.1%,34.8%和6.0 mmol.g-1.h-1.

Glycerol Dehydration and Consecutive Hydrogen Transfer to Allyl Alcohol over MoO3/SiO2 Catalyst

A series of MoO3/SiO2 catalysts was prepared by impregnation and was employed to produce allyl alcohol from glycerol. The catalysts were characterized by X-ray diffraction(XRD), scanning electron microscope(SEM), N2 Brunauer-Emmett-Teller(N2-BET), NH3 temperature programmed desorption(NH3-TPD) and Fourier transform infrared spectroscopy(FTIR) of pyridine adsorption. From glycerol to allyl alcohol, the effects of catalyst loading, reaction temperature, glycerol concentration, and gas hourly space velocity(GHSV) on the catalytic performance of MoO3/SiO2 were investigated in a fix-bed reactor. Under the optimal reaction conditions of 1%(mass fraction) loading, reaction temperature of 330 ℃, atmospheric pressure, 40%(mass fraction) of glycerol concentration and GHSV of 200 h-1, glycerol conversion, selectivity for allyl alcohol and the space time yield of allyl alcohol can be as high as 92.1%, 34.8% and 6.0 mmol·g-1·h-1, respectively.