摘要
Ni_2PRu/α-Al_2O_3是一种新型的催化加氢催化剂。该催化剂可以通过TiO_2进行改性。所得TiO_2-Ni2PRu/α-Al_2O_3中Ni2P晶粒的尺寸约为18nm,明显小于Ni2PRu/α-Al_2O_3中Ni2P晶粒的尺寸(24nm)。这可能与前驱体的还原性能有关。H2-TPR研究表明:Ni2PRu/α-Al_2O_3前驱体的峰顶还原温度位于500℃左右,而TiO_2-Ni2PRuO/α-Al_2O_3前驱体的中峰顶还原温度分别位于380℃和467℃左右。此外,H2-TPD的研究发现,TiO_2-Ni2PRu/α-Al_2O_3和Ni2PRu/α-Al_2O_3催化剂表面都具有丰富的解离氢。但TiO_2-Ni2PRu/α-Al_2O_3对植物油具有更优异的加氢脱氧性能。催化加氢性能的研究表明:Ni2PRu/α-Al_2O_3催化植物油加氢反应液相产物中未完全反应产物的质量分数小于5%,TiO_2-Ni2PRu/α-Al_2O_3对应的液相产物中未完全反应产物的质量分数则小于1%。
Ni_2PRu/α-Al_2O_3 is a new type catalyst for hydrodeoxygenation.Modification of Ni2 PRu/α-Al_2O_3 with TiO_2 is investigated.Crystal size of Ni2 P in the obtained catalysts,labelled as TiO_2-Ni2 PRu/α-Al_2O_3,is estimated to be 18 nm,which is smaller than that(24 nm)in Ni2 PRu/α-Al_2O_3.This behavior may be related with the reductionability of precursor.It is demonstrated by H2-TPR characterization that the reduction peak temperature of TiO_2-Ni2 PRu/α-Al_2O_3 precursor are located around 380℃and 467℃,being lower than that(500 ℃)of Ni2 PRu/α-Al_2O_3 precursor.Abundant dissociative hydrogen on the surface of TiO_2-Ni2 PRu/α-Al_2O_3 and Ni2 PRu/α-Al_2O_3 are proved by H2-TPD characterization.However,TiO_2-Ni2 PRu/α-Al_2O_3 shows better catalytic hydrodeoxygenation performance for vegetable oil.During its catalytic hydrodeoxygenation test,mass content of residual reactants in liquid products is calculated to be less than 1%.Such a value for Ni2 PRu/α-Al_2O_3 is estimated to be less than 5%.
引文
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