Using Zn-based metal organic frameworks (ZIF-8 and CHU-212) as hard templates to synthesize Zn/HZSM-5 catalysts and their applications in methanol aromatization

  • 曾 永澤

Student thesis: Doctoral Thesis

Abstract

In this research we used zinc-based MOFs (CHU-212 and ZIF-8) as hard templates and combined steam-assisted crystallization (SAC) to synthesize zinc-modified HZSM-5 These MOFs-derived catalysts were compared with conventional impregnation Physicochemical characterization exhibited all zinc-modified catalysts had finely dispersed zinc species including zinc oxide and [Zn(OH)]+ within HZSM-5; however the relative ratio of zinc oxide and [Zn(OH)]+ varied depending on different synthesis strategies and hard templates Using ZIF-8 as the hard template in combined with SAC strategy produced the highest concentration of [Zn(OH)]+ in all zinc-modified HZSM-5 The highest concentration of [Zn(OH)]+ of Zn/HZ-ZIF is related to its better performances in the aromatization of methanol due to the dehydrogenation activity of [Zn(OH)]+ All the tested catalysts were characterized by using various techniques including XRD ICP-AES TEM SEM BET TGA NH3-TPD IPA-TPD Pyridine-IR CO-IR XPS CO-TPSR and Methanol-TPSR
Date of Award2019
Original languageEnglish
SupervisorMing-Chang Yang (Supervisor)

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