Effect of the Post‐Treatment of HZSM‐5 on Catalytic Performance for Methanol to Aromatics. Issue 11 (19th March 2020)

• Record Type: Journal Article
• Authors: Li, Hui; Dong, Peng; Ji, Dong; Zhao, XinHong; Li, Chunqiang; Cheng, Chunhui; Li, Guixian
• Is Part Of: ChemistrySelect. Volume 5:Issue 11(2020)
• Page Start: 3413
• Page End: 3419
• Publication Date: 2020-03-19
• Subjects: Aromatics -- HZSM-5 zeolite -- p-xylene -- selectivity -- MTA reaction; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202000118
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The preparation of aromatic by methanol was the most effective way for rational utilization of resources. However, the catalyst for MTA reaction has not yet been successfully studied. Therefore, highly active and shape‐selective HZSM‐5 zeolite‐based catalysts were designed and synthesized by post‐treatments of desilication, dealumination, surface‐passivation and hydrothermal treatment tuning pore structure and acid amount and acid concentration of catalysts. XRD, SEM, TEM, BET, NH3 ‐TPD and Py‐IR were used for research and analysis the structure‐activity relationship between the catalysts and MTA reaction. The results showed that the total acid amount of catalyst shown a significant role in increasing the BTX selectivity. The selectivity of aromatics increased from 33 % to 58.1 % after hydrothermal treatment compared to the parent HZSM‐5 zeolite due to the decreased of total acid amount. Nevertheless the weak acid sites were crucial in increasing the p‐xylene selectivity. The selectivity of p‐xylene reached 63.8 % and 70.1 % after hydrothermal treatment and surface‐passivation due to the increased of weak acid sites, respectively. Modified HZSM‐5 zeolite‐base catalysts showed good application prospects in producing aromatics from methanol. Abstract : In this research, HZSM‐5 zeolite‐based catalysts was designed and synthesized for the reaction of methanol to aromatics. The modified catalysts have the most suitable acid concentration, acid site concentration, type, strength and distribution, showing good catalytic activity and stability in methanol to aromatics reaction. This was achieved by post‐treatment methods including desilication, subsequent dealumination, hydrothermal treatment and silanization deposition of SiO2 .