Y型分子筛酸性质对四氢萘加氢裂化多产BTX反应的影响  

Effects of Y Zeolite Acid Properties on the Hydrocracking Performance of Tetralin for BTX Production

作　　者：羡策 毛以朝[1] 龙湘云[1] 杨平[1] 韩伟[1] XIAN Ce;MAO Yichao;LONG Xiangyun;YANG Ping;HAN Wei(Research Institute of Petroleum Processing, SINOPEC, Beijing 100083, China)

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油学报（石油加工）》2021年第2期252-261,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：中国石油化工股份有限公司合同项目(S115049)资助。

摘　　要：以孔性质相近、酸性质存在差异的Y型分子筛为酸性组分制备加氢裂化催化剂,采用N2吸附-脱附、NH3-TPD、Py-IR、HRTEM等手段表征分子筛和催化剂的物化性质,以四氢萘为模型化合物在高压加氢微反装置上评价催化剂的加氢裂化反应性能。结果表明:提高Y型分子筛上强酸中心比例能促进四氢萘的转化;增加Y型分子筛上中强酸的占比和强B酸/强L酸酸量比有利于四氢萘的开环、断侧链反应,促进苯、甲苯、二甲苯混合物(BTX)的生成;改变Y型分子筛的酸性还可调变催化剂活性相结构及其加氢性能,进而影响BTX产物选择性。分子筛酸性质的调控是四氢萘加氢裂化生产BTX过程的关键因素。A series of hydrocracking catalysts were prepared using Y zeolites with similar pore properties but of different acid properties as the acid component.By virtue of N2 adsorption-desorption,NH3-TPD,Py-IR and HRTEM,the zeolites and catalysts were characterized.Then the hydrocracking performance of catalysts was investigated in a high-pressure fixed-bed microreactor.Results show that:(i)increasing the ratio of the strong acid sites of Y zeolites promotes the conversion of tetralin;(ii)increasing the ratio of medium strength acid sites and the strong B/strong L acid amount ratio of Y zeolites is beneficial to the ring-opening reaction of tetralin together with the following side-chain breaking reaction,promoting the formation of benzene,toluene and xylene(BTX);(iii)adjusting the acidity of Y zeolites also changes the active phase and the hydrogenation performance of catalyst,and thus affecting the selectivity of BTX.Hence,the acid properties of zeolites are the key factor for tetralin hydrocracking to produce BTX.

关 键 词：Y型分子筛 酸性中心 四氢萘 加氢裂化 苯、甲苯、二甲苯混合物(BTX) 

分 类 号：TE624[石油与天然气工程—油气加工工程] TQ426.95[化学工程]