Pd含量对催化剂加氢脱氧性能的影响

Effects of Pd Content on Catalytic Hydrodeoxygenation over Catalysts

采用浸渍法制备了系列不同Pd含量的催化剂,通过XRD、H_2-TPR、BET等分析表征技术和以油酸甲酯为模型化合物的加氢反应体系,考察了Pd含量对催化剂催化加氢脱氧性能和催化加氢饱和性能的影响。结果表明,适量的Pd有助于提高Pd在载体上的分散度,减小其与载体的相互作用强度,从而可提高催化剂的加氢脱氧性能和加氢饱和性能,也可使油酸甲脂的加氢脱氧方式越容易按加氢脱羧或脱羰的方式进行;2%Pd/γ-Al_2O_3催化剂的催化加氢脱氧转化率和加氢饱和转化率均为100%,且加氢脱氧方式完全按加氢脱羧或脱羰方式进行。

The Pd/γ-Al_2O_3 catalysts with different Pd contents were prepared by impregnation, and effects of Pd contents on hydrodeoxygenation and saturated hydrogenation performance over catalysts were studied by XRD, H_2-TPR, BET and other analytical characterization techniques and a reaction system with methyl oleate as model compounds. The results show that the proper Pd content can help to improve Pd dispersion in the support, and to reduce the strength of the interaction of Pd O-Al_2O_3 So hydrodeoxygenation and saturated hydrogenation performance of catalysts can be improved and hydrodeoxygenation is easily carried out according to the decarboxylation or decarbonylation way. Both the catalytic hydrodeoxygenation and saturated hydrogenation conversion of 2% Pd/γ-Al_2O_3 are 100%, and its catalytic hydrodeoxygenation is performed according to the full decarboxylation or decarbonylation way.