WP/γ-Al2O3催化剂负载方式对噻吩加氢脱硫性能的影响

以γ-Al2O3为载体，分别采用机械混合法、共浸渍法、分步浸渍法和程序升温、高纯氢气还原无定型磷钨酸盐的方法，制备了活性组分为磷化钨，负载量为20%的WP/γ-Al2O3催化剂。考察了不同方法制备的催化剂对噻吩加氢脱硫（HDS）反应的催化活性。结果表明：不同负载方式对催化剂结构有一定影响，对噻吩加氢脱硫性能的影响在低温时较明显。采用机械混合方式，先混合后还原方法制备的催化剂其HDS活性比先还原后混合方法制备的催化剂高；采用共浸渍和分步浸渍方式，通过焙烧所形成的催化剂其HDS活性分别比不经焙烧所形成的催化剂高或接近；浸渍焙烧所形成的催化剂其HDS活性远远高于机械混合法制备的催化剂。

EFFECT OF LOADING METHODS OF WP/γ-Al2O3 CATALYST ON THIOPHENE HDS ACTIVITY

WP/γ-Al2O3 catalyst whios active component is tungsten phosphide was prepared by mechanical mixing, co-impregnation and stepwise-impregnation methods, respectively from the tungsten phosphate precursor by means of temperature-programmed reduction in highly-pure flowing hydrogen. The HDS activity of thiophene over these catalysts was examined. The result revealed that the methods used for catalyst preparation had some effect on the catalyst structure and activity to HDS of thiophent especially for the lower temperature reaction. With mechanical mixing method, the HDS activity of the catalyst prepared by mixing then reduction is higher than that prepared by reduction then mixing. With co-impregnation and stepwise-impregnation methods, the HDS activity of the catalyst prepared by calcination is higher than that without calcination or close to each other, respectively. Catalysts prepared by impregnation had higher HDS activity than that prepared by mechanical mixing.