Construction of HZSM-5 with a Mesoporous Structure and Suitable Acidity: Application in Catalytic Syngas Conversion to Light Aromatics over Na–FeMn/HZSM-5 Zeolite

Abstract

The diffusion of aromatics in pores has a great influence on the distribution of light aromatics and the stability of zeolites, and the aromatics selectivity is related to the acidity of the zeolite. Here, the HZSM-5 zeolite, rich in a mesoporous structure and suitable acidity, was manufactured by hydrothermal crystallization in the presence of a NaOH/TPAOH mixed solution.Because the mesoporous structure of the HZSM-5 zeolite facilitates the diffusion of reactants and products, it can regulate the distribution of light aromatics in total aromatics and attenuate coke deposition. Meanwhile, the treated HZSM-5 zeolite can adjust the acidity to enhance the aromatics selectivity. The reasonable design of zeolites with abundant mesopores and suitable acidity provides a new clue for directly converting syngas to light aromatics. Through catalytic performance testing, we obtained 46.89% aromatics selectivity and 55.86% light aromatics in total aromatics at 94.86% CO conversion over mesoporous HZSM-5. Furthermore, the modified mesoporous HZSM-5 zeolite with Ce could tune the acidity to promote the aromatics selectivity to 51.33%, maintaining 46.77% light aromatics in total aromatics and high catalytic stability in the meanwhile.

Enhanced production of aromatics from syngas over CoMnAl oxides combined with b-axis thickness tailored HZSM-5

“…S3, ESI†). 31 From the N 2 adsorption–desorption results (Fig. 2b), the four zeolites possess type IV adsorption isotherms with capillary coalescence due to their micropores or mesopores.…”

Na-Modified Al2O3-Supported Nickel-Based Catalysts for Liquid-Phase Hydrogenation of Adiponitrile: Effect of Acidity

“…The support ZSM-5 was synthesized via the hydrothermal method using TPAOH as a template, TEOS as a silicon source, and AIP as an aluminum source. The molar ratio of composition is as follows: 50SiO 2 : 1Al 2 O 3 : 15TPAOH: 5NaOH: 1000H 2 O.…”

yIn2O3-ZnZrOx/Hierarchical ZSM-5 Tandem Catalysts for CO2 Hydrogenation to Aromatics Rich in Tetramethylbenzene

“…In recent years, studies on the conversion of CO 2 to C 2+ heavy products including olefins − and aromatics − have been reported. Aromatics are important components of fuels and major raw materials of fine chemicals. , Most aromatics are currently obtained by refining from petroleum products, which is restricted by the depletion of petroleum resources. , Developing the catalysts for environmentally friendly conversion CO 2 to aromatics not only restrains climate change with the utilization of CO 2 , but also decreases the use of fossil raw materials to relieve energy crisis …”