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

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• 作者：Zekai Zhang ; Dong Liu ; Xiangxue Zhu ; Haiwei Yu ; Shenglin Liu ; Longya Xu
• 关键词：desulfurization ; alkylation ; acidity ; Hβ ; gasoline
• 刊名：Journal of Natural Gas Chemistry
• 出版年：2008
• 出版时间：March 2008
• 年：2008
• 卷：17
• 期：1
• 页码：45-50
• 全文大小：1112 K

文摘

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 °C, 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.