纳米ZSM-5分子筛的液相沉积改性及其催化己烯-1芳构化反应性能  

Liquid deposition modification of nano-ZSM-5 zeolite and catalytic performance in aromatization of Hexene-1

作　　者：房玉俊 苏晓芳[1,2,3] 王巍 吴伟[1,2,3] FANG Yu-Jun;SU Xiao-Fang;WANG Wei;WU Wei(Heilongjiang UniversityNational Center for International Research on Catalytic technology;Functional Inorganic Materials Chemistry Ministry of Education;School of Chemical and Materials Science,Harbin 150080, China)

机构地区：[1]黑龙江大学催化技术国际联合研究中心 [2]功能无机化学教育部重点实验室 [3]化学化工与材料学院,哈尔滨150080

出　　处：《黑龙江大学工程学报》2021年第3期57-62,共6页Journal of Engineering of Heilongjiang University

基　　金：国家自然科学基金面上项目(21276067,21676074)。

摘　　要：烯烃芳构化是催化裂化(FCC)汽油改质、高辛烷值燃料油的重要手段。采用预制晶种法合成了纳米ZSM-5分子筛,并采用液相沉积法制备了Ga沉积量不同的系列改性纳米ZSM-5分子筛,分别采用XRD、N2物理吸附、SEM、TEM、XPS、H2-TPR和Py-IR等表征手段对改性前后的纳米ZSM-5分子筛的形貌、织构特性和酸性等进行了表征,并采用固定床微型反应器对其催化己烯-1芳构化反应性能进行了评价,研究了Ga改性对纳米ZSM-5分子筛的物理化学性质及催化性能的影响规律。Ga液相沉积改性的ZSM-5分子筛中Ga物种主要以Ga_(2)O_(3)和提供强Lewis酸性位的GaO^(+)形式存在,由于Ga改性提高了分子筛的脱氢反应活性,己烯-1芳构化反应的芳烃选择性显著提高,以Ga沉积量适宜的Ga4.2/NZ5为催化剂时,芳烃选择性高达55.4%。The Olefin aromatization is an important method for the upgrade of catalytic cracking(FCC)gasoline and production of fuel oil with high octane number.The nano-ZSM-5 zeolite were synthesized via a seed-induced method,a series of modified nano-ZSM-5 zeolite samples with different Ga deposition amount were prepared by Ga liquid deposition method.The XRD,N2 physical adsorption,SEM,TEM,XPS,H2-TPR and Py-IR measurements were used to characterize the morphology,textural properties and acidity of the modified ZSM-5 zeolites.The catalytic performance of the Hexene-1 aromatization was evaluated on a fixed-bed microreactor.The effects of Ga modification on the physicochemical and catalytic performance of nano-ZSM-5 zeolites were investigated.The Ga species in the modified nano-ZSM-5 zeolites mainly exist as the form of Ga_(2)O_(3) and GaO^(+),which provide strong Lewis acid sites.The aromatics selectivity over Ga modified nano-ZSM-5 zeolite in the Hexene-1 aromatization was significantly increased,which could be attributed to the improvement of the dehydrogenation activity.The selectivity for aromatics over the Ga4.2/NZ5 catalyst with suitable Ga deposition amount reached 55.4%.

关 键 词：纳米ZSM-5分子筛 Ga改性 液相沉积 己烯-1 芳构化 

分 类 号：O643.36[理学—物理化学]