期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 356, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2023.112589
关键词
Aromatization; HZSM-5; SAPO-34; Zn; MTA; Action mechanism
In order to improve the performance and stability of catalytic methanol aromatization, a Zn-modified HZSM-5/SAPO34 composite molecular sieve was synthesized using hydrothermal synthesis. The introduction of in-situ Zn changed the morphology of the molecular sieve, leading to a polycrystalline stacked bloom-like structure and abundant micro-pore channels. The introduction of secondary external Zn increased the amount of weak strong acidic sites and improved the BTX selectivity.
To improve the performance and stability of catalytic methanol aromatization, the Zn-modified HZSM-5/SAPO34(Zn-ZS) composite molecular sieve was synthesized by hydrothermal synthesis, and the modified composite molecular sieve was characterized using XRD, SEM, N2 isothermal adsorption-desorption, NH3-TPD, and XPS, and the catalysts were evaluated in catalytic methanol aromatization reactions. The results showed that the introduction of in-situ Zn greatly changes the morphology of the molecular sieve, presenting a polycrystalline stacked bloom-like structure, which brings abundant micro-pore channels to the molecular sieve, but at the same time, the introduction of metallic Zn also will cause more meso-pore channels losses. The introduction of secondary external Zn brought a large number of weak strong acidic sites, and the amount of molecular sieve acid was nearly doubled; weak acidic sites were strengthened, and the ratio of weak to strong acid amount became smaller. The BTX selectivity of the Zn-doped molecular sieve was significantly enhanced and the anti-coking performance was improved. The composite molecular sieve doped with 2% Zn achieves a 41% selectivity for the BTX within the 47 h lifetime, showing good reaction stability.
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