磷含量对负载型磷化钼催化剂性能的影响

EFFECT OF PHOSPHORUS CONTENT ON THE PERFORMANCE OF MoP/γ-Al_2O_3 CATALYST

以γ-Al_2O_3为载体,采用程序升温还原法合成了不同 P 含量的负载型磷化钼催化剂,并对所合成的催化剂进行了 XRD,BET,NH_3-TPD,TG 表征。在反应压力3MPa、反应温度370℃的条件下,以噻吩、吡啶、环己烯的混合物为模型化合物,通过高压微反装置对催化剂的加氢活性进行了测定。结果表明,P 的加入对催化剂的活性组分分散、表面酸性及表面酸量有一定的影响,适量P的加入可以提高 MoP/γ-Al_2O_3的加氢活性,P 质量分数为1.4%时,P-MoP/γ-Al_2O_3催化剂对噻吩、环己烯和吡啶的转化率分别为74.04%,88.50%,79.04%。

A series of MoP/γ-Al2O3catalysts with various phosphorus loadings were prepared by temperature programming reduction method, and characterized by XRD, BET, NH3-TPD and TG techniques. The catalytic activity of the prepared catalysts was evaluated on a continuous micro-reactor at 370℃ and 3. 0 MPa using mixed compounds containing thiophene, pyridine and cyclohexene as model feed. The results indicated that suitable phosphorus content had positive effect on the dispersion of active components, surface acidity and catalytic performance of the catalyst. Catalyst sample prepared with a phosphorus loading of 1.4% exhibited good hydrogenation activity, its conversion of thiophene, cyclohexene,and pyridine reached 74.04% ,88.50% and 79. 04%,respectively.