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Synergistic effect between acidity and metallicity on the methyl laurate hydrodeoxygenation performance for Ni-based catalyst
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DOI：10.1016/j.biombioe.2023.107002.png)
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Abstract
En 中文
Sulfur-free Ni/gamma-Al2O3 and Ni-based bimetallic Ni5X5/gamma-Al2O3 (X = Cu, Fe, Zn, Co, and Mn) catalysts prepared by impregnation method were characterized by H-2-TPR, XRD, BET, NH3-TPD, Py-IR, TEM, ESEM, XPS, and H-2-TPD. The effects of transition metal on the physicochemical properties and methyl laurate hydrodeoxygenation (HDO) performance of the studied Ni-based catalysts were also investigated. The results showed that all the prepared Nibased catalysts have mesoporous structure and large specific surface area (>130 m(2) g(-1)), the Ni, Cu, Fe, Zn, Mn, and Co species were dispersed highly over the Ni5X5/gamma-Al2O3 catalysts. The introduction of transition metal has a remarkable influence on the reducibility of Ni species and obviously improve the low temperature absorption desorption performance of the studied Ni-based catalysts to H-2 molecules. All the studied Ni-based catalysts can preferentially catalyze the methyl laurate to occur decarbonylation/carboxyl (DCO) reaction to produce C-11 alkanes, because of the synergy effects between metal centers and acid sites. The carbonyl and/or bridge oxygen atoms in methyl laurate can be activated by electrophilic acidic sites, the intermediate products can be attacked by the reactive H atoms formed on the metal centers. The selectivity of the hydrogenation products including C-11, C-12, and oxygenated compounds are obviously affected by transition metal additives. Methyl laurate conversion and C-11 alkanes selectivity can reach 99.8 and 87.3 % at 400 degrees C, respectively. In addition, the Ni5Cu5/gamma-Al2O3 catalyst possesses acceptable cycle and regeneration performances.
Keywords:
Mesoporous Ni5X5/gamma-Al2O3 catalyst
Synergetic catalysis
Hydrodeoxygenation
Methyl laurate
Catalytic hydrogenation
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