Information from the abstract
In this study, a sustainable catalytic route for converting ethanol into value-added acetaldehyde was developed using alkali- and alkaline earth-modified zeolite A synthesized from sugarcane bagasse ash (SCBA). Zeolite A was first prepared via alkaline fusion followed by hydrothermal crystallization and subsequently doped with 1 wt% K+ or Ca2+ using incipient wetness impregnation. Comprehensive physicochemical characterization (X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier transform infrared spectroscopy (FTIR), nitrogen physisorption (N2 physisorption), ammonia temperature-programmed desorption (NH3-TPD), and carbon dioxide temperature-programmed desorption (CO2-TPD)) confirmed the formation of a highly crystalline LTA framework with tunable acid-base properties upon cation incorporation. Catalytic evaluation demonstrated that ethanol dehydrogenation strongly depends on the balance of surface acid-base sites. The parent and Ca-modified zeolite A exhibited moderate acetaldehyde selectivity (11.2% and 21.2%, respectively), likely due to competing dehydration reactions. In contrast, K-modified zeolite A achieved higher acetaldehyde selectivity (51.8%) at 35.2% ethanol conversion, attributed to enhanced surface basicity and suppressed acidity. Mechanistic analysis suggests that K+ and Ca2+ promote ethanol dehydrogenation by facilitating ethoxide formation and β-hydrogen elimination on basic lattice oxygen sites. These findings demonstrate a cost-effective, noble-metal-free catalytic strategy and highlight the potential of SCBA-derived zeolite A as a sustainable platform for green ethanol upgrading.
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Related topics: Catalysis for Biomass Conversion · Catalysts for Methane Reforming · Carbon dioxide utilization in catalysis
Thai researcher and institutional participation
Darunee Sukchit · Malee Prajuabsuk · Chan Inntam · Saisamorn Lumlong · Bongkochawan Pakamwong · Auradee Punkvang · Duangkamol Gleeson · Pantita Trongjitraksa · Paramasivam Shanmugam · Supakorn Boonyuen · Niramol Juntarachat · Sasijuta Wattanarach · Parjaree Thavorniti · Bunjerd Jongsomjit · Pornpan Pungpo · Ubon Ratchathani University · Nakhon Phanom University · King Mongkut's Institute of Technology Ladkrabang · King Mongkut's University of Technology Thonburi · Thammasat University · Thaksin University · National Science and Technology Development Agency · Chulalongkorn University
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