Combined alkali dissolution and re-assembly approach toward ZSM-5 mesostructures with extended lifetime in cumene cracking

Peng Peng; Shu-Zhuang Sun; Yu-Xiang Liu; Xin-Mei Liu; Svetlana Mintova; Zi-Feng Yan

doi:10.1016/j.jcis.2018.06.013

Combined alkali dissolution and re-assembly approach toward ZSM-5 mesostructures with extended lifetime in cumene cracking

J Colloid Interface Sci. 2018 Nov 1:529:283-293. doi: 10.1016/j.jcis.2018.06.013. Epub 2018 Jun 9.

Authors

Peng Peng¹, Shu-Zhuang Sun², Yu-Xiang Liu³, Xin-Mei Liu², Svetlana Mintova¹, Zi-Feng Yan⁴

Affiliations

¹ State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China; Normandie Univ, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie, 14000 Caen, France.
² State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China.
³ State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China; College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, China.
⁴ State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China. Electronic address: zfyancat@upc.edu.cn.

PMID: 29909358
DOI: 10.1016/j.jcis.2018.06.013

Abstract

The basis and contribution of mesopores created in ZSM-5 structures at different treatment conditions are systematically investigated. The results reveal that the mesopores originated from the alkali dissolution of pristine ZSM-5 are mainly intracrystalline and they contribute to excessive Brønsted acid sites, while the mesopores originated from the re-assembly of alkali dissolved aluminosilicate species possess Lewis acid sites. These ZSM-5 mesostructures showed an extended lifespan during the cracking of cumene (88.0%) in comparison to the pristine ZSM-5 (27.0%) after 460 min. The zeolite mesostructures obtained in this study could be used as a base for further design of new porous materials with desired acidic properties.

Keywords: Acidity; Cumene cracking; Integrated synthesis method; ZSM-5 mesostructures.