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Babar Ali,Xiaocheng Lan,Muhammad Tahir Arslan,Syed Zulfiqar Ali Gilani,Huanjun Wang,Tiefeng Wang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.88 No.-
Glycerol dehydration to value-added acrolein over zeolite catalysts is a useful approach to offer asustainable economic route for the biodiesel industry. Glycerol dehydration over H-ZSM-5 withconventional morphology often exhibits a significant mass transfer limitation and inhibits the access toactive sites in the micropores, which causes low activity, selectivity, and severe catalyst deactivation. Inthis study, a significant impact of b-axis channel length on acrolein selectivity and catalyst activity wasrevealed by using H-ZSM-5 synthesized with varied channel length in b-axis of 60, 130, 180, and 250 nm. Complete glycerol conversion and high acrolein selectivity (88%) were observed over H-ZSM-5 with60 nm channels length in b-axis, due to high availability of active sites and enhanced diffusion throughthe shortest channels, which dramatically suppressed the coke formation. The catalysts with long b-axischannels exhibited a slow internal diffusion, leading to increased polymerization side reactions and cokeformation.
Yafei Li,Xiaocheng Lan,Boyang Liu,Tiefeng Wang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
A stable and highly efficient supported Cu-Ni catalysts for the conversion of ethyl levulinate (EL) toc-valerolactone (GVL) was developed. The catalysts were characterized by XRD, TEM, TPD, TPR, andXPS. The support effect of metal oxides (Al2O3, SiO2, ZrO2, and TiO2) revealed that Cu-Ni supported onAl2O3 showed the highest activity for EL hydrogenation to ethyl 4-hydroxypentanoate (EHP) and thesubsequent intramolecular esterification of EHP to GVL. EHP intramolecular esterification to GVL in theethanol solution was a reversible reaction with an equilibrium constant of 24 at 453 K. A simplified reactionkinetic network was established. The solvent had a significant influence on the reaction equilibriumand the catalyst stability. Cu-Ni/Al2O3 in n-hexane solvent gave a higher GVL yield than that in ethanolsolvent, and showed better recyclability than that in toluene solvent. With optimizing the conditions, Cu-Ni/Al2O3 gave 99.9% conversion and 98% selectivity to GVL with a space–time yield of 1.13 gGVL gcat-1 h1 inn-hexane solvent with good recyclability.