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Conversion of methanol into hydrocarbons over biomass‐assisted ZSM‐5 zeolites: effect of the biomass nature

Abstract Biomass waste was revealed to act as a promising bio-template to modify and possibly tailor the zeolite intrinsic properties: texture, porosity and acidity. According to the “bio-sourced secondary template (BSST)” concept, 7 types of abundant biomasses (lignin, oxidized lignin, coffee bagasse, spent tea leaves and three kinds of algae) were selected and their role was evaluated in the zeolite crystallization process. As-synthesized biomass-assisted ZSM-5 zeolites were characterized by XRD, SEM, BET and NH3-TPD techniques to decipher the effects of biomass extra-addition. The results show that both textural and surface acidic properties were significantly impacted by the presence of biomass. Among them, spent tea leaves-mediated ZSM-5 exhibited a high catalytic performance in the methanol-to-olefins reaction (MTO), with full methanol conversion for more than 50 h and a superior selectivity of 83% towards light olefins. Besides, ZSM-5 zeolites obtained using three algae (algaCM, algaBB and algaTM) demonstrated excellent stability and 50% methanol conversion at ca. 75, 134 and 94 h, respectively. This study led to synthesize potential catalysts exhibiting a high MTO catalytic performance, as well as providing some hints for future investigations aiming to control zeolite nucleation and growth following the BSST strategy.

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