Weerachawanasak, Patcharaporn

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Weerachawanasak, Patcharaporn
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patcharaporn.we@kmitl.ac.th

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    Flame spray-synthesized Pt-Co/TiO2 catalysts for the selective hydrogenation of furfural to furfuryl alcohol
    (2021-01-15)
    Tolek, Weerachon
    ;
    Khruechao, Kitima
    ;
    Pongthawornsakun, Boontida
    ;
    Mekasuwandumrong, Okorn
    ;
    Cadete Santos Aires, Francisco José
    Flame spray-synthesized Pt/TiO<inf>2</inf> and PtCo/TiO<inf>2</inf> catalysts with 0.7 wt% Pt and 0–0.4 wt% Co were studied in the hydrogenation of furfural to furfuryl alcohol (FA) at 50 °C and 2 MPa H<inf>2</inf>. Particle formation under high temperature flame facilitated high Pt dispersion and formation of Pt-TiO<inf>x</inf> interface sites, which were beneficial for furfural conversion to FA. Modifying with Co accelerated rutile phase TiO<inf>2</inf> formation, which strongly diminished hydrogenation activity on the (FSP)-PtCo/TiO<inf>2</inf>. On the other hand, (I)-PtCo/TiO<inf>2</inf> prepared by conventional impregnation, anatase phase TiO<inf>2</inf> was preserved (> 85%) and both furfural conversion and FA selectivity increased upon increasing Co loading.
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    Elucidation of the Catalytic Pathway for the Direct Conversion of Furfuryl Alcohol into γ-Valerolactone over Al2O3-SiO2 Catalysts
    (2023-12-12)
    Chuangpusri, Pichaya
    ;
    Jantasee, Sasiradee
    ;
    Weerachawanasak, Patcharaporn
    ;
    Tolek, Weerachon
    ;
    Ngamcharussrivichai, Chawalit
    The one-pot conversion of furfuryl alcohol (FA) into GVL was investigated over the sol-gel-synthesized Al<inf>2</inf>O<inf>3</inf>-SiO<inf>2</inf> (AlSi) catalysts with various Al<inf>2</inf>O<inf>3</inf> loadings (0.2-10 wt %) and commercial zeolites including MFI-1, H-ZSM5, H-beta, and HY-15 in a batch reactor under mild reaction conditions (130 °C, 1 bar N<inf>2</inf>, and 15-120 min). The reaction pathways depend largely on the acid properties of the catalysts, especially the types of Bronsted (B) and Lewis (L) acid sites. A tandem alcoholysis/hydrogenation/cyclization sequence is dominant on the AlSi catalysts (Al ≥ 4%) and all the zeolites except MFI-1, resulting in complete conversion of FA and GVL with an yield 64-75% with IPL as the major side-product, regardless of the differences in their B/L ratios 0.06-1.35. In the absence of B acid sites (i.e., 0.2% AlSi and MFI-1 catalysts), FA could be straightforwardly converted into GVL on the weak Lewis acid sites from the isolated silanol groups using 2-propanol as a hydrogen source. The AlSi catalysts are promising tunable catalysts for FA conversion with good recyclability.
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    One-Pot Conversion of Furfural to γ-Valerolactone over Co- and Pt-Doped ZSM-5 Catalysts
    (2023-03-01)
    Tolek, Weerachon
    ;
    Auppahad, Warucha
    ;
    Weerachawanasak, Patcharaporn
    ;
    Mekasuwandumrong, Okorn
    ;
    Praserthdam, Piyasan
    γ-Valerolactone (GVL) is one of the useful biomass compounds produced via different reaction pathways from hemicellulose. In this study, Co- and Pt-doped/ZSM-5 catalysts with different Co loadings (0–10 wt.%) and Pt loadings (0.5–2 wt.%) were prepared by impregnation method and employed in a one-pot conversion of furfural to GVL. The yield of GVL increased with increasing reaction temperature from 100 to 140 °C. At the reaction temperature of 120 °C, higher amounts of secondary products such as AL and IPL can be converted to GVL, especially on the Co- and Pt-modified ZSM-5 catalysts. Compared to the non-modified H-ZSM-5 (GVL yield 35.4%), Co- and Pt-doped ZSM-5 catalysts exhibited much higher yield of GVL with the 1%Pt/ZSM-5 catalyst showing the highest yield of GVL at 85.4% at 120 °C and 1 bar N<inf>2</inf> without the use of liquid acid or external H<inf>2</inf> supply. The catalyst performances were correlated to the physicochemical properties of the catalysts such as the amount and type of acid sites. The NH<inf>3</inf>-TPD and in situ FTIR spectra of pyridine adsorption results revealed that Co- and Pt-loaded on ZSM-5 enhanced Lewis and weak acid sites, which are beneficial for the reaction. The results present a simple strategy to obtain high GVL yield under relatively mild conditions.