Zeolites (HZSM-5) play a major role in the petrochemical industry. Recently, zeolite has been researched heavily in the valorization of biomass for renewable fuel and chemical generation. It has been particularly investigated for use in the conversion of small oxygenates such as ethanol to hydrocarbons because these compounds can be efficiently generated from biomass resources via thermochemical and/or biochemical pathways. This study focuses on examining the detailed deactivation mechanism for C2 oxygenates with various functional group (e.g. acetic acid, acetaldehyde and ethyl acetate) over the HZSM-5 catalyst. In general the formation of carbonaceous deposits (coke) in zeolite pores during catalysis leads to temporary deactivation of catalyst, necessitating regeneration steps, affecting throughput, and resulting in partial permanent loss of catalytic efficiency. In addition to the classic physical and chemical (e.g. TPD, TG, TEM) catalyst characterization techniques this talk will discuss combination of C K-edge X-ray absorption spectroscopy (XAS), 13C Cross polarization-magic angle spinning nuclear magnetic resonance (CP-MAS NMR) spectroscopy, and atom probe tomography (APT) to investigate catalytic deactivation due to hydrocarbon coking or poisoning of zeolites at an unprecedented spatial resolution.<br/>

Deactivation mechanism of zeolite (HZSM-5) catalyst form biomass derived small oxygenates conversion

2019 Spring National Meeting

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