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Catalytic Conversion of Biomass-derived Polyols into para-Xylene over SiO2-modified Zeolites
李全新
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李全新 中国科学技术大学化学物理系 liqx@ustc.edu.cn 
摘要:
This work proved that biomass-based polyols (sorbitol, xylitol, erythritol, glycerol and ethanediol) was able to be directionally converted into high-value chemical (p-xylene) by catalytic cracking of polyols, alkylation of aromatics and the isomerization of xylenes over the SiO2-modified zeolites. Compared to the conventional HZSM-5 zeolite, the SiO2-containing zeolites considerably increased the selectivity and yield of p-xylene due to the reduction of external surface acidity and the narrowing of pore entrance. The influences of the methanol additive, reaction temperature and types of polyols on the selectivity and yield of p-xylene were investigated in detail. Catalytic cracking of polyols with methanol significantly enhanced the production of p-xylene by the alkylation of toluene with methanol. The highest p-xylene yield of 10.9 C-mol% with a p-xylene/xylenes ratio of 91.1% was obtained over the 15% SiO2/HZSM-5 catalyst. The reaction pathway for the formation of p-xylene was addressed according to the study of the key reactions and the characterization of catalysts.
关键词:  Biomass-derived Polyols, para-Xylene, Catalytic conversion, SiO2-modified HZSM-5
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Catalytic Conversion of Biomass-derived Polyols into para-Xylene over SiO2-modified Zeolites
李全新
Abstract:
This work proved that biomass-based polyols (sorbitol, xylitol, erythritol, glycerol and ethanediol) was able to be directionally converted into high-value chemical (p-xylene) by catalytic cracking of polyols, alkylation of aromatics and the isomerization of xylenes over the SiO2-modified zeolites. Compared to the conventional HZSM-5 zeolite, the SiO2-containing zeolites considerably increased the selectivity and yield of p-xylene due to the reduction of external surface acidity and the narrowing of pore entrance. The influences of the methanol additive, reaction temperature and types of polyols on the selectivity and yield of p-xylene were investigated in detail. Catalytic cracking of polyols with methanol significantly enhanced the production of p-xylene by the alkylation of toluene with methanol. The highest p-xylene yield of 10.9 C-mol% with a p-xylene/xylenes ratio of 91.1% was obtained over the 15% SiO2/HZSM-5 catalyst. The reaction pathway for the formation of p-xylene was addressed according to the study of the key reactions and the characterization of catalysts.
Key words:  Biomass-derived Polyols, para-Xylene, Catalytic conversion, SiO2-modified HZSM-5