焙烧温度对WVOx/SiO2催化甘油气相脱水性能的影响

Effect of calcination temperature on the catalytic performance of WVOx/SiO2 for gas-phase dehydration of glycerol

摘要:

以工业级介孔SiO2为载体，通过浸渍法制得系列不同焙烧温度下的WVOx/SiO2催化剂(CatT，T=350、400、450、500、600)用于甘油气相脱水反应。BET、XRD、NH3-TPD和XPS结果显示CatT具有发达的介孔结构（d0 为5.1~6.8 nm），比表面积达到215-235 m2/g；焙烧温度有效地调控了WVOx在SiO2表面的分布、化学组成及酸强度。300 ℃时，Cat400（用量7 ml）上甘油（20 wt%）转化率达到89.3%，脱水产物丙烯醛和乙醛选择性分别达到53.4%和22.1%，液体冷凝产物碳平衡达到86%，且Cat400展现出较好的再生性。

Abstract:

In this study, WVOx/SiO2 catalysts (CatT, T=350, 400, 450, 500, 600), prepared through impregnation method using industrial mesoporous SiO2 as support, were used in gas-glycerol catalytic conversion. The BET, XRD, NH3-TPD, and XPS results showed that CatT have a well-developed mesoporous structure (d0 5.1-6.8 nm) with specific surface area of 215-235 m2/g. The calcination temperature effectively turned and adjusted the distribution, chemical composition, and acidic strength of WVOx on the surface of SiO2. At 300 ℃, the gas-glycerol conversion over Cat400 reached 89.3%, with the selectivity of acrolein and acetaldehyde reached 53.4% and 22.1%, respectively, and the carbon balance of liquid condensation products reaches 86%. Cat400 also showed good regeneration ability.