磷对MoCoNi/Al2O3催化剂性能及活性结构的影响

研究磷对MoCoNi/Al2O3催化剂反应性能及活性结构的影响。结果表明，添加磷的MoCoNiP/Al2O3催化剂在渣油加氢反应中具有更高的杂质脱除能力，而且催化剂加氢活性的提升改善了加氢后产品作为催化裂化原料的整体性能。DRS及TPR表征结果显示，添加磷的MoCoNiP/Al2O3催化剂活性组分的低温还原性提高，增加了八面体配位钼物种的数量，从而提高了催化剂活性。添加磷的MoCoNiP/Al2O3催化剂的孔体积和比表面积有所损失，不利于催化剂容金属能力的提升，但反应后催化剂表面的积炭量没有发生变化，说明催化剂的抗积炭性能得到了保持。

EFFECT OF PHOSPHORUS ON THE PERFORMANCE AND ACTIVE COMPONENT STRUCTURE OF MoCoNi/Al2O3 CATALYST

MoCoNi/Al2O3 and MoCoNiP/Al2O3 hydrotreating catalysts were prepared by saturation impregnation method respectively. The effect of phosphorus on the catalytic performance and active component structure of the catalysts was studied using Kuwait atmospheric residue as feedstock and characterizing by DRS, TPR and other techniques. Results showed that as compared with MoCoNi/Al2O3 catalyst, MoCoNiP/Al2O3 catalyst exhibited improved hydrotreating activity, and furthermore, its higher hydrogenation activity led to obtain a totally improved quality product for FCC feedstock. For MoCoNiP/Al2O3 catalyst, due to the increase of Mo(O) species in octahedral structure, the reduction ability of active components at low temperature was enhanced and the catalyst activity was promoted. The pore volume and surface area of the phosphorus modified catalyst were reduced in some extent, which was unfavorable to the metal tolerance performance of catalyst. However, the coke deposits on the catalysts with or without phosphorus were the same, indicating that the two catalysts had similar ability to restrain coke formation.