| 第 44 卷第 1 期 |  | Vol. 44 No. 1 | | 2014 年 2 月 | Feb 2014 |
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所属栏目：功能材料
微晶纤维素在SnOx／γ-Al2O3催化剂上的催化醇解反应研究 |
| 陈 谦1，黄嘉若2*，银董红2，陈信波1
（1. 湖南农业大学 生物科学技术学院，湖南 长沙 410128； 2. 湖南中烟工业有限责任公司 技术研发中心，湖南 长沙 410000） |
| 摘 要：以γ-Al2O3为载体，采用浸渍沉淀法，制备了不同SnOx负载量的SnOx／γ-Al2O3催化剂，采用X射线光电子能谱法（XPS）和吡啶吸附红外（Py-IR）光谱法对催化剂活性中心和表面酸性进行了表征，考察了不同载体和SnOx不同负载量的SnOx／γ-Al2O3催化剂对微晶纤维素催化醇解活性和产物分布的影响规律。结果表明，催化剂活性及产物分布与催化剂的表面酸性及SnOx负载量有关，载体表面较强的B酸中心有利于促进微晶纤维素催化醇解生成乙酰丙酸甲酯，而中等强度L酸中心有利于生成乳酸甲酯。以SnOx／γ-Al2O3为催化剂时，催化剂活性和乳酸甲酯生成量随SnOx负载量增加而增加，当Sn的负载量为6.75wt%时，在240℃反应10 h，微晶纤维素的转化率达82%，乳酸甲酯的收率达到28.1%。 |
| 关键词：微晶纤维素；SnOx催化剂；醇解；乳酸甲酯 |
| 中图分类号：TQ352 文献标识码：A 文章编号：1009-9212（2014）01-0051-06 |
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| The Studies on Catalytic Alcoholysis of Microcrystalline Cellulose over the Catalysts of SnOx／γ-Al2O3 |
| CHEN Qian1，HUANG Jia-ruo2，YIN Dong-hong2，CHEN Xin-bo1
（1. College of Bioscience Technology，Hunan Agricultural University，Changsha 410128，China；2. Research and Development Center of China Tobacco Hunan Industrial Co.，Ltd. Changsha 410007，China） |
| Abstract：A series of SnOx／γ-Al2O3 catalysts with different Sn loadings were prepared by impregnation precipitation method. The active sites and surface acidity of the catalysts were characterized by X-ray photoelectron spectroscopy（XPS）and pyridine adsorption infrared spectroscopy（Py-IR）. The effects of different supports and different Sn loadings on the catalytic activity and product distribution in the alcoholysis reaction of microcrystalline cellulose were investigated. It was found that the catalytic activity and product distribution were related to the surface acidity and Sn loadings. Strong Bronsted acid sites on the surface of the catalysts were beneficial to the alcoholysis reaction，while moderate Lewis acid sites were preferred for the generation of methyl lactate. The catalytic activity and the yield of methyl lactate were increased with an increase of Sn loading in the catalyst. A conversion of 82% of microcrystalline cellulose with 28.1% yield of methyl lactate could be obtained at 240℃ for 10 hours over the SnOx／γ-Al2O3 catalyst with 6.75%（m／m） of the Sn loading. |
| Key words：microcrystalline cellulose；SnOx catalyst；alcoholysis；methyl lactate |
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作者简介：陈 谦（1988-），女，湖北天门人，硕士，研究方向：催化化学。（E-mail：luckychenqian@163.com）
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联 系 人： 银董红，教授，研究方向：工业催化。（E-mail：yindh1127@hngytobacco.com）
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收稿日期： 2014-02-1
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