Frontiers of Chemical Science and Engineering
>> 2022,
Volume 16,
Issue 3
doi:
10.1007/s11705-021-2045-y
RESEARCH ARTICLE
Alkylation of benzene with carbon dioxide to low-carbon aromatic hydrocarbons over bifunctional Zn-Ti/HZSM-5 catalyst
. Engineering Research Center of Large-Scale Reactor Engineering and Technology, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China.. Department of Product Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
Received: 2021-03-16
Accepted: 2021-05-06
Available online: 2021-05-06
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Abstract
Alkylation of benzene to value-added, high octane number and low toxic toluene and xylenes provides a way to lower benzene content in gasoline pool, and is hence a method to promote fuel quality. On the other hand, CO accumulation in the atmosphere causes global warming and requires effective route for its valorization. Utilization of CO as a carbon source for benzene alkylation could achieve both goals. Herein, alkylation of benzene with CO and H was realized by a series of low-cost bifunctional catalysts containing zinc/titanium oxides (Zn/Ti oxides) and HZSM-5 molecular sieves in a fixed-bed reactor. By regulating and controlling oxygen vacancies of Zn/Ti oxides and the acidities of HZSM-5, benzene conversion and CO conversion reached 28.7% and 29.9% respectively, along with a total selectivity of toluene and xylene higher than 90%. In this process, more than 25% CO was effectively utilized and incorporated into the target products. Moreover, the mechanism of the reaction was analyzed and the course was simultaneously traced. CO was transformed into methanol firstly, and then methanol reacted with benzene generating toluene and xylene. The innovation provides a new method for upgrading of fuels and upcycling the emissions of CO , which is of great environmental and economic benefits.
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