水热体系下ZrO<sub>2</sub>-SiO<sub>2</sub>混合氧化物催化纤维素转化

摘要采用共沉淀法合成了混合氧化物ZrO₂-SiO₂。用XRD,BET,NH₃-TPD对其结构性质进行了表征。在水热条件下利用该催化剂催化纤维素转化。考察了n(Zr)/n(Si)、反应时间、反应温度等因素对纤维素转化的影响。结果表明,ZrO₂-SiO₂混合氧化物具有较高的酸量,n(Zr)/n(Si)=7时催化剂酸量最高,催化效果最优。反应条件为200 ℃、2.5 MPa N₂、5 min时,纤维素转化率达到59.0%,葡萄糖、乳酸、乙酰丙酸、5-HMF的总收率为26.9%。

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关键词：微晶纤维素; 氧化锆; 混合氧化物; 水热体系

Abstract： Mixed-Oxide ZrO₂-SiO₂ was prepared by co-precipitation method and characterized by XRD, BET and NH₃-TPD. The conversion of cellulose catalyzed by ZrO₂-SiO₂ was studied under hot compressed water (HCW) condition. The influences of Zr/Si molar ratio, reaction time and temperature on cellulose conversion were investigated. Results showed that ZrO₂-SiO₂ possessed more acid sites. ZrO₂-SiO₂ with a Zr/Si molar ratio of 7:1 presented the highest acidity and reactivity toward hydrolysis and dehydration reactions. The conversion of cellulose reached 59.0% and the total yield of glucose, lactic acid, levulinic acid and 5-HMF were 26.9% within 5 min at 200 ℃, 2.5 MPa N₂.

Keywords： microcrystalline cellulose; zirconia; mixed oxide; hot compressed water (HCW)

Received 2013-12-05;

Fund:

国家自然科学基金(21076152, 21276191);教育部博士点基金(2100032110018)。

Corresponding Authors: 王华,电话:(022)27890859,E-mail:tjuwanghua@tju.edu.cn。 Email: tjuwanghua@tju.edu.cn

About author: 王华(1973-),女,副教授,现研究纤维素转化利用。

引用本文:

王华, 宋志强, 牛宇飞, 韩金玉.水热体系下ZrO₂-SiO₂混合氧化物催化纤维素转化[J]. 化学工业与工程, 2015,32(1): 1-5

Wang Hua, Song Zhiqiang, Niu Yufei, Han Jinyu.Catalytic Conversion of Cellulose in the Presence of Mixed-Oxide ZrO₂-SiO₂ Under Hot Compressed Water (HCW) Condition[J]. Chemcial Industry and Engineering, 2015,32(1): 1-5

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