Sn-MCM-41与SnO2/SiO2催化转化生物质基碳水化合物制乳酸甲酯

以生物质基碳水化合物为原料,以Sn-MCM-41和SnO2/SiO2为催化剂,在亚临界甲醇中制备乳酸甲酯.发现具有高度有序介孔结构的Sn-MCM-41和部分有序介孔结构的SnO2/SiO2-a都有较好的催化活性,在最优反应条件下,乳酸甲酯的收率可达40.3%.采用X射线衍射、N2吸附-脱附、透射电镜、吡啶吸附红外光谱和NH3程序升温脱附等技术对反应前后的催化剂进行了表征.结果表明,乳酸甲酯的收率与反应时间、反应温度以及催化剂的酸量有关.另外,Sn-MCM-41和SnO2/SiO2催化剂循环使用5次后其活性变化不大.结果显示,反应后这两种催化剂的Sn流失量小于0.15%,其结构以及酸性种类也没有...

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Bibliographic Details
Published in催化学报 Vol. 33; no. 10; pp. 1696 - 1705
Main Author 刘镇 冯刚 潘春燕 李望 陈平 楼辉 郑小明
Format Journal Article
LanguageChinese
Published 绍兴市质量技术监督检测院,浙江绍兴312071%浙江大学化学系催化研究所,浙江杭州,310028 2012
浙江大学化学系催化研究所,浙江杭州310028
Subjects
MCM-41
乳酸甲酯
二氧化硅
二氧化锡
生物质基碳水化合物
酸性
生物质基碳水化合物
乳酸甲酯
二氧化锡
MCM-41
酸性
二氧化硅
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Summary:以生物质基碳水化合物为原料,以Sn-MCM-41和SnO2/SiO2为催化剂,在亚临界甲醇中制备乳酸甲酯.发现具有高度有序介孔结构的Sn-MCM-41和部分有序介孔结构的SnO2/SiO2-a都有较好的催化活性,在最优反应条件下,乳酸甲酯的收率可达40.3%.采用X射线衍射、N2吸附-脱附、透射电镜、吡啶吸附红外光谱和NH3程序升温脱附等技术对反应前后的催化剂进行了表征.结果表明,乳酸甲酯的收率与反应时间、反应温度以及催化剂的酸量有关.另外,Sn-MCM-41和SnO2/SiO2催化剂循环使用5次后其活性变化不大.结果显示,反应后这两种催化剂的Sn流失量小于0.15%,其结构以及酸性种类也没有明显变化.
Bibliography:biomass-derived carbohydrate; methyl lactate; MCM-41; tin oxide; silica; acidity
Biomass is a promising alternative for sustainable supply of precious intermediates and fine chemicals to the chemical industry.Lactic acid（2-hydroxypropanoic acid） and its related alkyl lactates are widely used in chemicals,food,pharmaceuticals,and cosmetic products.A study of the liquid-phase conversion of biomass-derived carbohydrates directly to methyl lactate catalyzed by Sn-MCM-41 and SnO2/SiO2 in subcritical methanol is presented.With glucose as substrate,methyl lactate yield reached 40.3% under the optimal reaction conditions.Fresh and used catalysts were characterized by X-ray diffraction,N2 adsorption-desorption,transmission electron microscopy,infrared spectroscopy with pyridine adsorption,and NH3 temperature-programmed desorption techniques.Methyl lactate yield was closely related to reaction temperature,reaction time,and the acidic site amount of catalysts.The catalysts were active and can be reused without significan
ISSN:0253-9837
1872-2067
DOI:10.3724/SP.J.1088.2012.20533