超临界水体系中纤维素模型物的高效气化  

Catalytic Gasification of Cellulose Model in Supercritical Water System

作　　者：陈善帅 孙向前 高娜 关清卿[1] 何亮 GHEN Shan-shuai;GAO Na;GUAN Qing-qing;HE Liang(Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China;School of Energy and Environment Science,Yunnan Normal University,Kunming 650500,China;Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,Chin)

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650500 [2]云南师范大学能源与环境科学学院,云南昆明650500 [3]昆明理工大学化学工程学院,云南昆明650500

出　　处：《造纸科学与技术》2018年第3期37-41,共5页Paper Science & Technology

基　　金：国家自然科学基金面上项目(21077076)

摘　　要：用Ru/C催化剂在超临界水体系下催化气化纤维素模型物—葡萄糖制备氢气、甲烷等气体。通过分析气化体系的过程参数(气化温度、停留时间、水密度以及催化剂加入量等)对葡萄糖超临界体系下气化效果的影响,发现:Ru/C催化剂的加入可以显著提高气体的摩尔产率和碳化率。在添加适当量催化剂0.5g/g(催化剂与葡萄糖量之比)时,提高气化温度、水密度以及延长反应时间有利于葡萄糖的气化转化。当Ru/C催化剂使用量为0.5g/g,反应温度450℃,时间30min,水密度0.098g/cm^3时催化5.0%的葡萄糖溶液时,所得CH4和H2的物质的量可达13mmol/g和11mmol/g,碳化率达到了94%。最后,针对该过程进行了化学动力学模拟,得出葡萄糖在超临界水热气化体系下生成气体和焦体的活化能和频率因子分别为125.73±13.31kJ/mol和21.15±2.29,而焦体的活化能和频率因子分别为16.26±0.76 kJ/mol和1.25±0.13。Glucose, the cellulose model, was gasified supercritical water to produce hydrogen, methane and other gases in the presence of Ru/C catalysts to achieve for high efficiency gasification. The impacts of the process parameters （ gasification temperature, residence time, water density and the amount of catalyst loading, etc. ） of gasification system on the gasification behavior and the gasification product distribution were analyzed. It was found that the addition of Ru/C catalyst could obviously increase the molar yield and carbon efficiency of the gas. Enhancing temperature, increasing water density and prolonging the reaction time benefited the gasification when 0.5g/g catalyst loading was added. The molar yield of CH4 and H2 was 13 mmol/g and 1 lmmol/g when the reaction conditions were as follows： 0.5g/g catalyst loading, reaction temperature 450℃, residence time 30 rain, water density 0.098 g/cm^3 and 5 wt% glucose, the carbonization rate reached 94%. The kinetic model of this experiment describes the generation of gas and the formation of the coke body. The activation energies and frequency factors of gas formation in the gasification of glucose were 125.73±13.31 kJ/mol and 21.15±2. 29, respectively, while the activation energies arid frequency factors of the coke formation were 16. 26±0. 76 kJ/mol and 1.25±0. 13, respectively.

关 键 词：超临界水 葡萄糖 气化 

分 类 号：TS79[轻工技术与工程—制浆造纸工程]