HZSM-5/MCM-41 molecular sieve (H-ZM) catalysts with well-defined micro/mesoporous structures were synthesized and showed high performance for selective synthesis of triacetin via the esterification reaction of glycero...HZSM-5/MCM-41 molecular sieve (H-ZM) catalysts with well-defined micro/mesoporous structures were synthesized and showed high performance for selective synthesis of triacetin via the esterification reaction of glycerol with acetic acid. The conversion of glycerol was demonstrated to be 100% and the triacetin selectivity was over 91%, which can be attributed to the synergistic effect regarding suitable acidic property, excellent diffusion efficiency and good stability derived from the combined advantages of microporous molecular sieve HZSM-5 and mesoporous molecular sieve MCM-41.展开更多
为提高烟用三乙酸甘油酯含量检测结果的稳定性,对标准YC 144—2008中三乙酸甘油酯含量的气相色谱(GC)测定方法进行了改进,通过考察稀释溶剂、样品量、所用容器等因素的影响,建立了一种新的三乙酸甘油酯含量测定的GC方法,并采用该方法测...为提高烟用三乙酸甘油酯含量检测结果的稳定性,对标准YC 144—2008中三乙酸甘油酯含量的气相色谱(GC)测定方法进行了改进,通过考察稀释溶剂、样品量、所用容器等因素的影响,建立了一种新的三乙酸甘油酯含量测定的GC方法,并采用该方法测定了61个国内外烟用三乙酸甘油酯样品的纯度。结果表明:1优化确定的实验条件为:10μL三乙酸甘油酯样品于2 m L色谱瓶中,加入1 m L丙酮,混合均匀后进行GC检测,峰面积归一化法定量。2方法的相对标准偏差(RSD)小于0.009%,且在48 h内测定结果无明显变化。3所测样品中三乙酸甘油酯的含量均≥99.0%,有55个样品的含量结果≥99.5%。该方法操作简便、有机溶剂用量少、结果稳定,适合于烟用三乙酸甘油酯样品的含量测定。展开更多
基金Supported by the National Natural Science Foundation of China(21620102007)the Natural Science Foundation for High Education of Jiangsu Province(17KJB530011)+1 种基金the Science and Technology Innovation Foundation of Yangzhou University(2017CXJ015)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘HZSM-5/MCM-41 molecular sieve (H-ZM) catalysts with well-defined micro/mesoporous structures were synthesized and showed high performance for selective synthesis of triacetin via the esterification reaction of glycerol with acetic acid. The conversion of glycerol was demonstrated to be 100% and the triacetin selectivity was over 91%, which can be attributed to the synergistic effect regarding suitable acidic property, excellent diffusion efficiency and good stability derived from the combined advantages of microporous molecular sieve HZSM-5 and mesoporous molecular sieve MCM-41.
文摘为提高烟用三乙酸甘油酯含量检测结果的稳定性,对标准YC 144—2008中三乙酸甘油酯含量的气相色谱(GC)测定方法进行了改进,通过考察稀释溶剂、样品量、所用容器等因素的影响,建立了一种新的三乙酸甘油酯含量测定的GC方法,并采用该方法测定了61个国内外烟用三乙酸甘油酯样品的纯度。结果表明:1优化确定的实验条件为:10μL三乙酸甘油酯样品于2 m L色谱瓶中,加入1 m L丙酮,混合均匀后进行GC检测,峰面积归一化法定量。2方法的相对标准偏差(RSD)小于0.009%,且在48 h内测定结果无明显变化。3所测样品中三乙酸甘油酯的含量均≥99.0%,有55个样品的含量结果≥99.5%。该方法操作简便、有机溶剂用量少、结果稳定,适合于烟用三乙酸甘油酯样品的含量测定。
