Catalytic Conversion of Biomass-Derived Polyols into Para-xylene over SiO2-Modified Zeolites  

二氧化硅改性分子筛催化生物质基多元醇制备对二甲苯（英文）

作　　者：Sheng-fei Wang Ming-hui Fan Yu-ting He Quan-xin Li 王声飞;范明慧;何雨婷;李全新(中国科学技术大学化学物理系中国科学院城市污染物转化重点实验室安徽省生物质洁净能源重点实验室)

机构地区：[1]Department of Chemical Physics, CAS Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Anhui Key Laboratory of Biomass Clean Energy, University of Science and Technology of China, Hefei 230026, China

出　　处：《Chinese Journal of Chemical Physics》2019年第4期513-520,I0003,共9页化学物理学报（英文）

基　　金：supported by the National Key R&D Program of China (No.2018YFB1501404)

摘　　要：This work proved that biomass-based polyols (sorbitol, xylitol, erythritol, glycerol and ethanediol) were able to be 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 15wt%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 

分 类 号：O643.36[理学—物理化学] O625.11[理学—化学]