Acidity effects of Hβ zeolite on olefin alkylation of thiophenic sulfur in gasoline

• Published in: Journal of natural gas chemistry Vol. 17; no. 1; pp. 45 - 50
• Main Authors: Zhang, Zekai, Liu, Dong, Zhu, Xiangxue, Yu, Haiwei, Liu, Shenglin, Xu, Longya
• Format: Journal Article
• Language: English
• Published: Chengdu Elsevier B.V 01.03.2008; Dalian Institute of Chemical Physics; The Graduate University of Chinese Academy of Science,Beijing 100049,China%Dalian Petrochemical Corporations,CNPC,Dalian 116032,Liaoning,China%State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China%State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China; Dalian Petrochemical Corporations,CNPC,Dalian 116032,Liaoning,China; State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China; The Graduate University of Chinese Academy of Science,Beijing 100049, China
• Subjects: acidity; alkylation; Applied sciences; Crude oil, natural gas and petroleum products; desulfurization; Energy; Exact sciences and technology; Fuels; gasoline; Petroleum products, gas and fuels. Motor fuels, lubricants and asphalts; 烷基化; 脱硫过程; alkylation; desulfurization; Hβ; acidity; gasoline; Sulfur content; Desulfurization; Olefin; Motor gasoline; Thiophene; Zeolite; Alkylation
• ISSN: 1003-9953
• DOI: 10.1016/S1003-9953(08)60024-9

Olefin alkylation of thiophenic sulfur process was carried out in model gasoline, using Hβ zeolites with different Si/Al2 ratios as catalysts. In particular, the influence of acid properties of Hβ zeolites on its catalytic ability for the thiophene alkylation, xylene alkylation and hexene oligomerization was investigated. The results showed that the acidity of the Hβ zeolite was increased with the decrease of Si/Al2 ratio, but its catalytic ability was not always increased. In fact, it reached the maximal catalytic ability at Si/Al2 ratio of 66, and under the reaction conditions of 60 ℃, 1.5 MPa, WHSV 3.0 h^-1 and time on stream 2 h. At the ratio, the conversion of thiophene, xylene, and oligomerized hexene were 96.6%, 2.7% and 2.8%, respectively. An optimal Si/Al2 ratio exists for the catalytic performance of Hβ zeolite. By investigating the coke deposition of the used Hβ zeolite catalysts, it has been found that the optimal Si/Al2 ratio is attributed to the combined effect of the carbocation activation capability and the hydrogen transformation capability of the Hβ zeolite catalyst.