| 第 44 卷第 1 期 |  | Vol. 44 No. 1 | | 2014 年 2 月 | Feb 2014 |
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所屬欄目：功能材料
微晶纖維素在SnOx／γ-Al2O3催化劑上的催化醇解反應研究 |
| 陳 謙1，黃嘉若2*，銀董紅2，陳信波1
（1. 湖南農業(yè)大學(xué) 生物科學(xué)技術(shù)學(xué)院，湖南 長(cháng)沙 410128； 2. 湖南中煙工業(yè)有限責任公司 技術(shù)研發(fā)中心，湖南 長(cháng)沙 410000） |
| 摘 要：以γ-Al2O3為載體，采用浸漬沉淀法，制備了不同SnOx負載量的SnOx／γ-Al2O3催化劑，采用X射線(xiàn)光電子能譜法（XPS）和吡啶吸附紅外（Py-IR）光譜法對催化劑活性中心和表面酸性進(jìn)行了表征，考察了不同載體和SnOx不同負載量的SnOx／γ-Al2O3催化劑對微晶纖維素催化醇解活性和產(chǎn)物分布的影響規律。結果表明，催化劑活性及產(chǎn)物分布與催化劑的表面酸性及SnOx負載量有關(guān)，載體表面較強的B酸中心有利于促進(jìn)微晶纖維素催化醇解生成乙酰丙酸甲酯，而中等強度L酸中心有利于生成乳酸甲酯。以SnOx／γ-Al2O3為催化劑時(shí)，催化劑活性和乳酸甲酯生成量隨SnOx負載量增加而增加，當Sn的負載量為6.75wt%時(shí)，在240℃反應10 h，微晶纖維素的轉化率達82%，乳酸甲酯的收率達到28.1%。 |
| 關(guān)鍵詞：微晶纖維素；SnOx催化劑；醇解；乳酸甲酯 |
| 中圖分類(lèi)號：TQ352 文獻標識碼：A 文章編號：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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作者簡(jiǎn)介：陳 謙（1988-），女，湖北天門(mén)人，碩士，研究方向：催化化學(xué)。（E-mail：luckychenqian@163.com）
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聯(lián) 系 人： 銀董紅，教授，研究方向：工業(yè)催化。（E-mail：yindh1127@hngytobacco.com）
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收稿日期： 2014-02-1
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