摘要
以硅胶为载体,通过共沉淀法制备了SnO_(2)/SiO_(2)复合固体酸催化剂,并经硫酸酸化调控其表面酸性质,用于山梨醇脱水制异山梨醇。系统研究了硫酸酸化条件(酸浓度、用量、温度和时间)对催化剂性能的影响,结合NH_(3)-TPD、Py-FTIR等表征手段揭示了催化剂表面酸性质与催化性能的内在联系。结果表明,最佳酸化条件为2.5 mol/L硫酸、硫酸用量[v(SO_(4)^(2-))∶m(Sn-Si)]5∶1、60℃、酸化3 h,在此条件下130℃反应5 h,异山梨醇收率达75.7%。同时,通过原位FT-IR探讨了催化作用机制,分析表明反应中间产物在催化剂表面形成稳定吸附态。
A SnO_(2)/SiO_(2) composite solid acid catalyst is prepared via the coprecipitation method using silica gel as the carrier,and its surface acidity is regulated by sulfuric acid modification.The catalyst is served for the dehydration of sorbitol to isosorbide.The influences of sulfuric acid modification conditions(concentration,dosage,temperature,and time)on the performance of the catalyst are systematically studied,and the actual relationship between the surface acidity and the catalytic performance of the catalyst is revealed by characterization methods such as NH3-TPD and Py-FT-IR.It is shown by the results that the optimal modification conditions include 2.5 mol/L sulfuric acid,v(SO_(4)^(2-))∶m(Sn-Si)=5∶1,a temperature at 60℃,and a modification time of 3 h.Under these conditions,when the reaction was carried out at 130℃for 5 h,the yield of isosorbide reached 75.7%.Meanwhile,the catalytic mechanism is analyzed by in-situ FT-IR,and it is found that the intermediate products formed in the reaction are stably adsorbed on the catalyst surface.
作者
李慧
龙邦贤
杨豪飞
杨睿
王新承
LI Hui;LONG Bang-xian;YANG Hao-fei;YANG Rui;WANG Xin-cheng(Beijing Key Laboratory of Enze Biomass Fine Chemicals,College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《现代化工》
北大核心
2025年第9期99-105,112,共8页
Modern Chemical Industry
基金
北京石油化工学院致远科研基金(2024103)
北京市属高等学校优秀青年人才培育计划项目(BPHR^(2)02203092)
国家级大学生创新创业训练计划(2025J00229)
国家自然科学基金项目(21908009)。
关键词
山梨醇
固体酸
催化脱水
异山梨醇
sorbitol
solid acids
catalytic dehydration
isosorbide
