Snβ制备工艺对其催化果糖转化生成乳酸甲酯性能的影响  

Effects of Snβpreparation procedures on fructose conversion to methyl lactate

作　　者：蒋雨希 魏茜文 任傲天 吕喜蕾 吕秀阳[1] JIANG Yuxi;WEI Xiwen;REN Aotian;LYU Xilei;LYU Xiuyang(Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310058,China;Zhejiang Hengyi Petrochemical Research Institute Co.Ltd.,Hangzhou 311209,China)

机构地区：[1]浙江大学生物质化工教育部重点实验室,浙江大学化学工程与生物工程学院,浙江杭州310058 [2]浙江恒逸石化研究院有限公司,浙江杭州311209

出　　处：《高校化学工程学报》2024年第1期105-112,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(22078290,22278358)。

摘　　要：乳酸甲酯(MLA)是重要的生物质基平台化合物。Snβ分子筛催化生物质糖醇解制备MLA技术具有重要的工业化应用前景。针对Snβ分子筛催化剂制备工艺对其活性和重复使用性能影响的研究非常不系统、不全面等问题,详细考察了Snβ分子筛催化剂制备过程中脱铝、浸渍和焙烧等3步的工艺参数对其结构及催化果糖转化生成MLA性能的影响。结果表明,Snβ分子筛制备过程中市售Hβ分子筛脱铝步骤需要强酸,其中硝酸较佳;Hβ分子筛的硅铝比(物质的量比(n(Si):n(Al))、酸处理过程中酸浓度、浸渍液中SnCl_(2)浓度和焙烧温度都存在较佳条件,具体为:以n(Si):n(Al)=60的Hβ分子筛为原料、经质量分数为47%的HNO_(3)脱铝、再在浓度为0.1 mol·L^(-1)的SnCl_(2)乙醇溶液中浸渍、最后在550℃下焙烧得到的催化剂具有较佳的反应活性,用该催化剂180℃下催化果糖反应6 h时MLA收率最高可达53.6%;此外,该催化剂还具有良好的重复使用性能;表征结果显示,采用上述工艺制备的催化剂,Sn可以进入β分子筛骨架。本研究可为生物质非均相催化醇解制备MLA技术的工业化提供参考。Methyl lactate(MLA)is an important biomass-based platform chemical.The alcoholysis of biomass sugar to produce MLA using Snβzeolite is promising for industrial application.Currently,research about preparation processes of Snβzeolites catalysts on their activity and reusability is incomplete.The parameters of dealumination,impregnation and calcination processes during Snβzeolites preparation on their structure and catalytic performance in the conversion of fructose to MLA were investigated in this study.The results show that strong acids are needed in the dealumination step of commercial Hβzeolite during the preparation of Snβzeolites,and nitric acid is the best.Optimal conditions are existed considering the molar ratio(n(Si):n(Al))of original Hβzeolite,HNO_(3)concentration for dealumination,SnCl_(2)concentration for impregnation and calcination temperature.Specifically,the catalyst obtained using Hβzeolite with n(Si):n(Al)of 60 as raw material,dealuminating with 47%HNO_(3),impregnating in 0.1 mol×L^(-1)SnCl_(2)ethanol solution,and calcining at 550 for 6 h has the best reactivity,which gives MLA yield of 53.6%at 180 for 6 h.In℃℃addition,the catalyst has good reusability.Characterization results show that Sn is incorporated in the framework ofβzeolite in the catalyst prepared by the above process.This study provides a guidance for the industrialization of MLA preparation from biomass via heterogeneous catalytic alcoholysis.

关 键 词：果糖 乳酸甲酯 Snβ分子筛 催化剂制备工艺 

分 类 号：TQ032.4[化学工程]