NiW/SAPO-11催化剂孔结构性质对其柴油异构降凝性能的影响  

Effect of Pore Structure of NiW/SAPO-11 on Its Catalytic Performance for Diesel Fuel Hydroisomerization Dewaxing

作　　者：魏晓鸣 柳云骐 刘晨光 

机构地区：[1]中国石油大学化学工程学院重质油国家重点实验室,山东青岛266580

出　　处：《石油学报（石油加工）》2015年第6期1394-1401,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究"973"项目(2010CB226905);国家自然科学基金项目(21006128;U1162203)资助

摘　　要：选用SAPO-11分子筛代替传统的ZSM-5分子筛作为酸性载体,Ni和W作为金属组分制备异构降凝催化剂。利用扩孔剂炭黑对催化剂进行扩孔处理,提高催化剂的传质性能,促进原料和产物分子的扩散。以长庆直馏柴油为原料,采用高压固定床微反装置,考察了扩孔剂含量对催化剂异构降凝催化性能的影响。结果表明,随着扩孔剂含量的增加,催化剂的孔容不断增大,大孔数量不断增多,其柴油异构降凝性能逐渐加强。其中,7%C/NiW/SAPO-11催化剂的异构降凝催化性能最好,在反应温度340℃、反应压力4.0 MPa、空速1.0h^(-1)、氢/油体积比500的条件下,凝点由0℃降至-11℃,柴油收率高达98%。Hydroisomerization dewaxing catalyst NiW/SAPO-11 was prepared with SAPO-11 zeolite as acidic carrier instead of ZSM-5 zeolite and NiW double metals as the active components. In the catalyst preparation pore-enlarging reagent （carbon black） was used to elevate mass transfer performance of the catalyst and promote the diffusion process of the materials and products. The hydroisomerization dewaxing performance of the prepared C/NiW/SAPO-11 catalyst was evaluated with Changqing straight-run diesel oil as raw material in the high-pressure fixed-bed microreactor. The influence of pore-enlarging reagent on the hydroisomerization dewaxing performance of catalysts was investigated. Experimental results showed that the pore volume and the number of large pore of C/NiW/SAPO-11 catalysts increased with the increase of pore-enlarging reagent content, so the hydroisomerization dewaxing performance of catalysts was improved. With 7℃/NiW/SAPO-11 as catalyst under the reaction conditions of 340℃, 4.0 MPa, LHSV 1.0 and H2/oil volume ratio 500, the best hydroisomerization dewaxing performance could be obtained, that is, the freezing point of diesel fuel dropped from 0℃ to --2℃ with the diesel yield as high as to 98%.

关 键 词：SAPO-11 异构降凝 扩孔 

分 类 号：TE624.4[石油与天然气工程—油气加工工程]