Role of alkali and alkaline-earth doped in zeolite A-derived from industrial waste toward direct ethanol dehydrogenation to acetaldehyde

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

doi:10.55713/jmmm.v36i3.2647

ผู้แต่ง

Darunee SUKCHIT Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
Malee PRAJUABSUK Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
Chan INNTAM Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
Saisamorn LUMLONG Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
Bongkochawan PAKAMWONG Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
Auradee PUNKVANG Division of Chemistry, Faculty of Science, Nakhon Phanom University, Nakhon Phanom 48000, Thailand
Duangkamol GLEESON Applied Computational Chemistry Research Unit and Department of Chemistry, School of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Pantita TRONGJITRAKSA Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
Paramasivam SHANMUGAM Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathum Thani 12120, Thailand
Supakorn BOONYUEN Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathum Thani 12120, Thailand
Niramol JUNTARACHAT Faculty of Engineering, Thaksin University, Phattalung 93210, Thailand
Sasijuta WATTANARACH National Metal and Materials Technology Center, National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
Parjaree THAVORNITI National Metal and Materials Technology Center, National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
Bunjerd JONGSOMJIT Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand / Bio-Circular-Green-Economy Technology & Engineering Center, BCGeTEC, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
Pornpan PUNGPO Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i3.2647

คำสำคัญ:

Zeolite A, Alkali, Alkaline earth, Ethanol dehydrogenation, Acetaldehyde

บทคัดย่อ

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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