Citation: SHI Wenlu, QIAO Qingdong, LI Qi, REN Tieqiang, YU Tingyun. Alkylation of Benzene with Coal Oil to Heavy Alkylbenzene Catalyzed by Urea Modified β-Molecular Sieve[J]. Chinese Journal of Applied Chemistry, ;2019, 36(3): 291-299. doi: 10.11944/j.issn.1000-0518.2019.03.180189 shu

Alkylation of Benzene with Coal Oil to Heavy Alkylbenzene Catalyzed by Urea Modified β-Molecular Sieve

School of Petrochemical Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, China

Corresponding author: QIAO Qingdong, qiaoqingdong@163.com LI Qi, liqifs@163.com
Received Date: 24 May 2018
Revised Date: 17 August 2018
Accepted Date: 20 September 2018

Figures(8)

Molecular sieve catalysts with different pore structures and acidity were prepared by acid pickling and alkali washing modification of β-molecular sieve with n(Si):n(Al)=15:1. The structure, properties, and the application of β-molecular sieve catalysts in alkylation of benzene were investigated by scanning electron microscopy(SEM), X-ray diffraction(XRD), N₂ adsorption-desorption, NH₃-TPD(temperature programmed desorption) and Py-FTIR(Fourier transform infrared spectroscopy). The results show that hydrochloric acid leaching can enlarge the pore size, specific surface area and pore volume of β-molecular sieve, but weaken the acidity, while the sodium hydroxide solution leaching results in the collapse of molecular sieve skeleton, leading to the destruction of the acidity and the pore structure. Modification by urea not only improves the pore structure of molecular sieve, but also has little effect on the acidity of molecular sieve. It is a mild and effective way to modify the molecular sieve. β-molecular sieve catalyst modified with urea has the best activity in alkylation of benzene with coal-based cold trap oil:the conversion of olefin is 91.2%, and the selectivities of 2-HAB(heavy alkylbenzene) and 3-HAB isomers are 50.1% and 33.55%, respectively, accounting for 84% of the total alkylation product.
- β-molecular sieve,
- coal-based cold trap oil,
- alkylation reaction,
- urea
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