贵金属和载体对催化剂催化脱氧裂化性能的影响

Effects of Precious Metals and Supports on Catalytic Hydrodeoxygenation and Hydrocracking Performance over Catalysts

采用浸渍法制备了一系列分别负载活性组分Pt,Pd,Ru的γ-Al2O3载体催化剂和分别以固体酸γ-Al2O3,Si O2-Al2O3,USY-Al2O3为载体的Pd催化剂。通过XRD、HRTEM、H2-TPR、NH3-TPD、BET等分析表征技术和以油酸甲酯为模型化合物的反应体系,考察了贵金属及载体性质对催化剂催化加氢脱氧性能和催化裂化性能的影响。结果表明:贵金属及其粒子大小是影响催化剂催化加氢脱氧活性的主要因素;载体的酸强度、酸量是影响催化剂催化裂化性能的主要因素。同时,该性能也受比表面积和孔结构特征的影响;Pd/USY-Al2O3在系列催化剂中表现出了良好的催化加氢脱氧活性和最佳的催化裂化活性。

Several γ-Al2O3 supported active metal（Pt, Pd, Ru） catalysts and various Pd catalysts with various solid acid supports（γ-Al2O3, Si O2-Al2O3, USY-Al2O3） were prepared by impregnation, and effects of properties of precious metals and supports on hydrodeoxygenation and hydrocracking performance over catalysts were studied by XRD, HRTEM, H2-TPR, NH3-TPD, BET and other analytical characterization techniques and a reaction system with methyl oleate as model compounds. The results show that the metal properties of the active components and their sizes are decisive factors for hydrodeoxygenation conversion; the carrier acidity is extremely important for the product selectivity. In addition, the specific surface area and the pore structure of catalysts are also important factors; Pd/USY-Al2O3 in catalysts has a good catalytical hydrodeoxygenation activity and the best catalytical hydrocracking activity.