Transformation of Isobutyl Alcohol to Aromatics over Zeolite-Based Catalysts
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- 作者：Lili Yu ; Shengjun Huang ; Shuang Zhang ; Zhenni Liu ; Wenjie Xin ; Sujuan Xie ; Longya Xu
- 刊名：ACS Catalysis
- 出版年：2012
- 出版时间：June 1, 2012
- 年：2012
- 卷：2
- 期：6
- 页码：1203-1210
- 全文大小：390K
- 年卷期：v.2,no.6(June 1, 2012)
- ISSN：2155-5435
文摘
One-step transformation of isobutyl alcohol to aromatics (benzene, toluene, and xylene) has been studied in a gas phase, fixed-bed reactor system over several purely acidic zeolites and zeolite-supported metal catalysts. ZSM-5 zeolites give higher aromatics yields (42 wt %) among the evaluated zeolites, and the Si/Al ratios (Si/Al = 13鈥?3) of ZSM-5 slightly influence their catalytic performances. During the transformation of isobutyl alcohol, large amounts of short alkanes (mainly propane and butane isomers) are also generated on the acidic ZSM-5. To improve the conversion to aromatics, several metal species (Zn, Ga, Mo, La, Ni, Ag, and Pt) are supported on the ZSM-5. The enhancements in aromatics yields (60 wt %) are observed only on the Zn/ZSM-5 catalysts. The incorporation of Zn species preferentially decreases the strong-strength Br酶nsted acidity and, thus, suppresses the cracking to C3 fragments. Moreover, mainly the Zn species at the exchange sites facilitate the recombinative desorption of H2 and, hence, enhance the reactions toward aromatics. Through these effects, Zn/ZSM-5 catalysts exhibit the remarkably promoted formation of toluene and xylene and inhibit the generation of undesired alkanes products.