含分子筛NiMoP/Al2O3催化剂上邻二甲苯异构化的反应性能

以具有不同孔结构的微孔分子筛为酸性组分，制备了含分子筛的硫化态NiMoP/Al2O3催化剂。考察了临氢条件下邻二甲苯的异构化反应，采用XRD、N2吸附 脱附、吡啶吸附红外和SEM等表征手段对分子筛及催化剂样品进行物化性质分析。结果表明，分子筛的孔结构和酸性中心的可接近性是影响该催化剂体系上邻二甲苯的反应活性及产物分布的主要因素。在反应温度为300℃、氢分压40 MPa、氢气/邻二甲苯（体积比）为1000的条件下，含Beta分子筛催化剂的总反应活性及异构化反应活性最高。与由Al2O3和分子筛挤条成型制得的催化剂相比，使用NiMoP/Al2O3和分子筛机械混合催化剂的邻二甲苯异构化反应活性明显提高。

Isomerization of o-Xylene Over Zeolite-Containing NiMoP/Al2O3 Catalysts

A series of sulfided catalysts were prepared by using zeolites with different pore structure as acidic components. The catalytic performance of NiMoP catalysts containing zeolites (NiMoP/Al2O3 zeolite) was evaluated by the hydroisomerization of o xylene. Zeolites and catalysts were characterized by XRD, N2 adsorption desorption, pyridine FTIR and SEM techniques. The results show that the pore structure and the accessibility of acid sites of zeolites are the main factors,which influence both catalytic activity and product distribution over NiMoP/Al2O3 zeolite catalysts. Among NiMoP/Al2O3 and NiMoP/Al2O3 zeolite catalysts, NiMoP/Al2O3 Beta exhibits the highest total activity and isomerization activity, under the reaction conditions of 300℃, H2 partial pressure of 40 MPa and H2/o xylene volume ratio of 1000. The catalysts prepared by mechanically mixing NiMoP/Al2O3 with zeolite show higher activity of o xylene isomerization than those prepared by extrudation.