TY - JOUR
T1 - Mesoporous Beta zeolites with controlled distribution of Brønsted acid sites for alkylation of benzene with cyclohexene
AU - Huang, Yeqing
AU - Wang, Manna
AU - Huang, Yi (Harvey)
AU - Shang, Jin
AU - Liu, Baoyu
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (No. 21978055 , 22278090 ), Natural Science Foundation of Guangdong Province , China (No. 2022A1515012088 ), the Science and Technology Planning Project of Guangdong Province , China (No. 2022A0505050073 , 2022A0505030013 ).
Publisher Copyright:
© 2023 The Authors
PY - 2023/9
Y1 - 2023/9
N2 - The distribution of Brønsted acid sites in three-dimensional 12-membered pore channels of Beta zeolite was a decisive factor in the alkylation of benzene with cyclohexene. Here, the Brønsted acid site distribution in Beta zeolitic channels was precisely regulated by tuning the content of Na+ in crystallization system combined with tetraethylammonium cation, the Beta-55 with Brønsted acid sites exclusively located in straight channels (along a- and b-axis directions) was successfully synthesized by utilizing tetraethylammonium as the structure-directing agents without Na+ species, and the fraction of Brønsted acid sites in sinusoidal/straight channels of Beta zeolites can be accurately controlled by tailoring the content of Na+ in synthesis gel. Catalytic properties in the liquid alkylation between benzene and cyclohexene exhibited that Beta-55 zeolites with the Brønsted acid sites solely located in a-axis and b-axis channels showed the highest cyclohexene conversion, cyclohexylbenzene selectivity and longest lifetime in this reaction. In addition, the resultant Beta zeolites also exhibited low coke generation rate and robust regeneration performance in the alkylation reaction.
AB - The distribution of Brønsted acid sites in three-dimensional 12-membered pore channels of Beta zeolite was a decisive factor in the alkylation of benzene with cyclohexene. Here, the Brønsted acid site distribution in Beta zeolitic channels was precisely regulated by tuning the content of Na+ in crystallization system combined with tetraethylammonium cation, the Beta-55 with Brønsted acid sites exclusively located in straight channels (along a- and b-axis directions) was successfully synthesized by utilizing tetraethylammonium as the structure-directing agents without Na+ species, and the fraction of Brønsted acid sites in sinusoidal/straight channels of Beta zeolites can be accurately controlled by tailoring the content of Na+ in synthesis gel. Catalytic properties in the liquid alkylation between benzene and cyclohexene exhibited that Beta-55 zeolites with the Brønsted acid sites solely located in a-axis and b-axis channels showed the highest cyclohexene conversion, cyclohexylbenzene selectivity and longest lifetime in this reaction. In addition, the resultant Beta zeolites also exhibited low coke generation rate and robust regeneration performance in the alkylation reaction.
U2 - 10.1016/j.rineng.2023.101377
DO - 10.1016/j.rineng.2023.101377
M3 - Article
SN - 2590-1230
VL - 19
JO - Results in Engineering
JF - Results in Engineering
M1 - 101377
ER -