Ni基双金属催化剂的制备及其加氢脱氧反应性能

PREPARATION OF Ni-BASED BIMETALLIC CATALYSTS AND THEIR CATALYTIC PERFORMANCE OF HYDRODEOXYGENATION

采用浸渍法制备了一系列负载于γ-Al_(2)O_(3)上的Ni基双金属催化剂,考察助剂金属(Mo,Co,Ce)对Ni基催化剂加氢脱氧反应性能的影响。采用X射线衍射、低温N_(2)物理吸附、NH_(3)程序升温脱附、H_(2)程序升温还原、X射线光电子能谱等表征手段对催化剂进行表征。以正丁醇为模型化合物,在固定床微型反应装置上对催化剂的加氢脱氧性能进行评价,结果表明助剂Ce对催化剂加氢脱氧反应性能的促进作用最为显著,在210℃时基本实现正丁醇的完全转化,助剂Mo对C—O键的活化能力更强,对产物正丁烷的选择性明显高于其余助剂。

A series of Ni-based bimetallic catalysts supported onγ-Al_(2)O_(3) were prepared by impregnation method.The effects of metal promoters(Mo,Co and Ce)on the hydrodeoxygenation(HDO)performance of Ni-based catalysts were investigated.The catalysts were characterized by XRD,N_(2) physical adsorption at low temperature,NH_(3)-TPD,H_(2)-TPR and XPS.Using n-butanol as model compound,the HDO performance of catalysts was evaluated in a fixed-bed micro-reactor.The results showed that the promoter Ce had most significant effect on the HDO performance of the catalyst,the complete conversion of n-butanol was achieved at 210℃,while the activation of C—O bond by Mo was stronger,and the selectivity of n-butane was higher than that of other promoters.