Abstract

A study is performed to establish the main factors that allow regulation of the activity and selectivity of the synthesis of solketal from glycerol and acetone, and the acidic and catalytic properties of mordenite zeolites (MOR, SiO₂ : Al₂O₃ = 29.2) and faujasite (FAU, SiO₂ : Al₂O₃ = 14.9; 97 and 810). The reaction is studied in a methanol solution at an acetone : glycerol molar ratio of 2.5 and a temperature of 25–50°C. Using zeolites, the main product is solketal with a selectivity of 88.1–94.7%. It is shown that the main factors determining the conversion of glycerol and the yield of solketal are the accessibility of the reagents to active sites, the number and strength of acid sites, and their resistance to the toxic action of water molecules that form during the reaction.

中文翻译：

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沸石结构和酸度对甘油和丙酮合成醇缩酮的影响

摘要

进行了一项研究，以确定调节甘油和丙酮合成乙二醇缩酮的活性和选择性的主要因素，以及丝光沸石（MOR，SiO ₂ : Al ₂ O ₃ = 29.2）的酸性和催化性能，以及八面沸石（FAU，SiO ₂ : Al ₂ O ₃ = 14.9；97 和 810）。该反应在甲醇溶液中进行研究，丙酮与甘油的摩尔比为 2.5，温度为 25–50°C。使用沸石，主要产品是乙二醇缩酮，选择性为 88.1-94.7%。结果表明，决定甘油转化率和乙二醇缩酮收率的主要因素是试剂对活性位点的可及性、酸位点的数量和强度以及它们对反应过程中形成的水​​分子的毒性作用的抵抗力。