文章摘要
贾冰.Sn-MCM-22分子筛催化DHA制备乳酸酯[J].精细化工,2020,37(11):0
Sn-MCM-22分子筛催化DHA制备乳酸酯
Synthesis of alkyl lactates with DHA catalyzed by Sn-MCM-22
投稿时间:2020-05-12  修订日期:2020-07-06
DOI:
中文关键词: 乳酸酯  1,3-二羟基丙酮  后处理合成方法  催化技术
英文关键词: alkyl lactates  1,3-dihydroxyacetone  post-synthetic method  catalysis technology
基金项目:中国石油大学(华东)研究生创新工程资助项目(YCXJ2016049)
作者单位E-mail
贾冰 China University of Petroleum-East China jiabchina@163.com 
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中文摘要:
      以MCM-22分子筛为原料,采用SnCl4对其后处理改性合成了Sn-MCM-22催化剂,用于催化1,3-二羟基丙酮(DHA)与醇制备乳酸酯。XRD、SEM、N2吸附-脱附、UV-vis和Py-IR表征结果显示:Sn以嵌入分子筛骨架和SnO2接枝方式改性MCM-22,改性催化剂具有强Lewis和Br?nsted复合双酸性位点,有效催化DHA制备乳酸酯。催化反应结果表明:选用Sn-MCM-22催化剂催化DHA甲醇溶液(0.25mol/L),反应温度120℃,反应时间15 h,乳酸甲酯收率达96.3%。催化剂催化DHA与乙醇、正丙醇、正丁醇反应,相应的乳酸酯收率达到86.4%~88.4%,催化剂具有良好的循环稳定性。
英文摘要:
      Sn-MCM-22 catalysts were synthesized using a post-synthetic method of MCM-22 zeolite with SnCl4 for converting 1,3-dihydroxyacetone (DHA) and alcohol to alkyl lactates. The characterization results of XRD, SEM, N2 adsorption-desorption, UV-Vis, Py-IR demonstrated that Sn was incorporated into the tetrahedral framework and uniformly grafted as SnO2 nanoparticles on Sn-MCM-22. Sn-MCM-22 possessed Lewis and Br?nsted acid sites, and effectively catalyzed DHA to prepare alkyl lactates. The yield of methyl lactate reached 96.3 %, under the conditions: DHA methanol solution (0.25 mol/L), the reaction temperature was 120 oC, and the reaction time was 15 h. In addition, the high yields of alkyl lactates, up from 86.4% to 88.4%, were produced from ethanol, n-propanol, and n-butanol, respectively. The catalyst displays good cycling and stability performance.
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