In-Sn-Beta分子筛催化微晶纤维素产乳酸  

Production of lactic acid from microcrystalline cellulose over In-Sn-Beta molecular sieves

作　　者：苌城 董文杰 沈峥[1,2] 顾敏燕 夏梦[1] 张亚雷 

机构地区：[1]同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室,上海200092 [2]同济大学新农村发展研究院,上海200092

出　　处：《现代化工》2018年第2期66-69,71,共5页Modern Chemical Industry

基　　金：国家自然科学基金(21676205)

摘　　要：在从生物质合成的各种化学品中,乳酸以其多功能、高需求的特点,展现出巨大的市场潜力。区别于传统发酵的生产方式,采用Zn-Sn-Beta和In-Sn-Beta分子筛催化剂进行一步法催化结晶纤维素生产的研究,结果发现,Zn-Sn-Beta和In-Sn-Beta分子筛的催化效果要优于单金属催化剂Zn-Beta和In-Beta。在纤维素的质量为215 mg,水的用量为5 m L,催化剂质量为160 mg,反应温度为200℃,反应时间为4 h的最佳反应条件下,2种分子筛催化产生的可溶性有机物比率均接近60%,乳酸产率约为20%。其中,催化产乳酸产率最高达24.7%的In-Sn-Beta分子筛重复使用效果较好,3次使用过后仍能将产率维持在20%以上。利用双金属分子筛催化纤维素产乳酸为替代化石燃料的可持续发展途径提供了重要的基础参考数据。As a renewable resource,biomass,with huge quantity and extensive sources,can be used to produce platform chemical substitutions for fossil resources like coal and oil. Among those chemicals,lactic acid extends promising potential in the market due to its multifunction and high demand. Instead of conventional fermentation production method,this paper focuses on the production of lactic acid through one-pot catalytic conversion of microcrystalline cellulose over Zn-Sn-Beta and In-Sn-Beta molecular sieves,respectively. It is found that the catalytic effects of Zn-SnBeta and In-Sn-Beta molecular sieves are better than that of single-metal catalysts such as Zn-Beta and In-Beta. The ratio rates of soluble organic substances over Zn-Sn-Beta and In-Sn-Beta molecular sieves both approach to 60% and the yield rate of lactic acid both are around 20% when the reaction carries out under the optimal conditions that the dosages of cellulose,water and catalyst are 215 mg,5 m L and 160 mg respectively,and reaction lasts for 4 h at 200℃. Particularly,In-Sn-Beta molecular catalyst,over which the highest yield rate of lactic acid is 24. 7%,shows better recyclability that the yield of lactic acid still remains above 20% after three times repeated usages. The production of lactic acid from cellulose over dual-metal molecular sieves can provide important reference data for the sustainable development approach of replacing fossil fuels.

关 键 词：微晶纤维素 乳酸 Zn-Sn-Beta分子筛 In-Sn-Beta分子筛 

分 类 号：O643.3[理学—物理化学]