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The catalytic pyrolysis of glucose over amphoteric metal oxide, ZnO or γ-Al2O3, was studied comparatively with direct pyrolysis. The effects of catalyst to glucose ratio on the yields of pyrolytic products and on the chemical composition of the liquid products were discussed. Compared with the pyrolytic products of direct pyrolysis, the amount of residual char decreased, whereas the gas yield increased in the presence of the catalysts. The highest liquid yield over ZnO(49.5%) was obtained when the ratio of ZnO to glucose was 5%, whereas over γ-Al2O3 the liquid yield increased with increasing the amount of γ-Al2O3 added. The presence of both the catalysts enhanced the selectivity to furans in liquid and reduced that of anhydro sugars. A selectivity of 69.7% to furans was obtained over 1% ZnO with a selectivity of 14.6% to 5-hydroxymethylfurfural(HMF). The maximum selectivity to furans(74.9%) and that to HMF(25.6%) were obtained in the presence of 10% γ-Al2O3.
The catalytic pyrolysis of glucose over amphoteric metal oxide, ZnO or γ-Al2O3, was studied comparatively with direct pyrolysis. The effects of catalyst to glucose ratio on the yield of pyrolytic products and on the chemical composition of the liquid products were discussed. Compared with the pyrolytic products of direct charcoal, the amount of residual char decreased, while the gas yield increased in the presence of the catalysts. The highest liquid yield over ZnO (49.5%) was obtained when the ratio of ZnO to glucose was 5% over γ-Al2O3 the liquid yield increased with increasing the amount of γ-Al2O3 added. The presence of both the catalysts enhanced the selectivity to furans in liquid and reduced that of anhydro sugars. A selectivity of 69.7% to furans was obtained over 1% ZnO with a selectivity of 14.6% to 5-hydroxymethylfurfural (HMF). The maximum selectivity to furans (74.9%) and that to HMF (25.6%) were obtained in the presence of 10% γ-Al2O3.