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Renewable p-Xylene Production by Co-catalytic Pyrolysis of Cellulose and Methanol
Chi Tang1, Li-juan Zhu1, Ming-hui Fan2, Quan-xin Li*1
1.Department of Chemical Physics, 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;2.Anhui Key Laboratory of Tobacco Chemistry, Anhui Tobacco Industrial. Co., Ltd., Hefei 230088, China
Abstract:
This work developed a one-step process for renewable p-xylene production by co-catalytic fast pyrolysis (co-CFP) of cellulose and methanol over the different metal oxides modified ZSM5 catalysts. It has been proven that La2O3-modified ZSM5(80) catalyst was an effective one for the production of biobased p-xylene. The selectivity and yield of p-xylene strongly depended on the acidity of the catalysts, reaction temperature, and methanol content. The highest p-xylene yield of 14.5 C-mol% with a p-xylene/xylenes ratio of 86.8% was obtained by the co-CFP of cellulose with 33wt% methanol over 20%La2O3-ZSM5(80) catalyst. The deactivation of the catalysts during the catalytic pyrolysis process was investigated in detail.The reaction pathway for the formation of p-xylene from cellulose was proposed based on the analysis of products and the characterization of catalysts.
Key words:  Cellulose, p-Xylene, Catalytic fast pyrolysis, La2O3-modified ZSM5
FundProject:
纤维素和甲醇共催化热解制备对二甲苯
唐 驰1, 朱丽娟1, 范明慧2, 李全新*1
1.中国科学技术大学化学物理系,安徽省生物质洁净能源重点实验室,中国科学院城市污染物转化重点实验室,合肥 230026;2.安徽中烟工业有限责任公司,烟草化学安徽省重点实验室,合肥 230088
摘要:
本文对纤维素和甲醇在不同金属氧化物改性的ZSM5催化剂作用下共催化快速热解实现一步制备可再生对二甲苯的过程进行了研究. 结果表明,镧改性的ZSM5催化剂是生产生物基对二甲苯的有效催化剂. 对二甲苯的选择性和产率主要由催化剂酸性、反应温度和甲醇含量决定. 在20%La2O3-ZSM5(80)催化剂作用下,纤维素与33wt%甲醇共催化快速热解获得对二甲苯的最高收率和对二甲苯/二甲苯的最高比率分别为14.5 C-mol%和86.8%. 本文详细研究了催化热解过程中催化剂的失活,基于产物的分析和催化剂的表征提出了由纤维素制备对二甲苯的可能反应途径.
关键词:  纤维素,对二甲苯,催化快速热解,镧改性的ZSM5
DOI:10.1063/1674-0068/31/cjcp1803028
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