高水热稳定性加氢脱氧催化剂Pt/Ce_(0.5)M_(0.5)O_2(M=Zr,Ti)的制备及其性能研究

分别采用共沉淀法和溶胶凝胶法制备了具有高水热稳定性的Ce_(0.5)M_(0.5)O_2(M=Zr,Ti)载体,并通过浸渍法制得高分散Pt/Ce_(0.5)M_(0.5)O_2(M=Zr,Ti)催化剂,分析了短链脂肪醇作为氢供体用于香兰素加氢脱氧反应的催化性能.实验结果表明,复合氧化物催化剂Pt/Ce_(0.5)M_(0.5)O_2(M=Zr,Ti)具有高的水热稳定性和优良的加氢脱氧活性,且Pt/Ce_(0.5)Zr_(0.5)O_2较Pt/Ce_(0.5)Ti_(0.5)O_2的催化性能更胜一筹,催化剂的加氢脱氧性能与其表面的酸性质以及贵金属Pt在载体上的高度分散有关.短链脂肪醇作为含氢的有机小分子,可作为氢源替代氢气,是理想有效的氢供体.

Study on the preparation and property of Pt/Ce0.5M0.5O2(M=Zr,Ti) catalysts with high hydrothermal stability for hydrodeoxygenation

Mixed oxides Ce_0.5M_0.5O₂(M=Zr, Ti) with high hydrothermal stability were prepared by the coprecipitation and sol-gel method, and highly dispersed Pt/Ce_0.5M_0.5O₂(M=Zr, Ti) catalysts were effectively synthesized by impregnation. The catalytic property of short-chain aliphatic alcohols as hydrogen donors for the hydrodeoxygenation (HDO) of vanillin over Pt/Ce_0.5M_0.5O₂(M=Zr, Ti) catalysts was investigated. It was found that the mixed oxides Ce_0.5M_0.5O₂(M=Zr, Ti) were the supports with high hydrothermal stability, and the catalytic activity of Pt/Ce_0.5Zr_0.5O₂ for HDO of vanillin was superior to that of Pt/Ce_0.5Ti_0.5O₂. The catalytic property was mainly attributed to the surface acidity and the highly dispersed Pt supported on the catalyst. The short-chain aliphatic alcohols, as the hydrogenous organic small moleculars, were the alternative hydrogen resources and could be used as the ideal and effective hydrogen donors due to their availability and high safety.