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首页> 外文期刊>Catalysis science & technology >Trimethylsilyl functionalization of alumina (gamma-Al2O3) increases activity for 1,2-propanediol dehydration
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Trimethylsilyl functionalization of alumina (gamma-Al2O3) increases activity for 1,2-propanediol dehydration

机译：三甲基硅烷基铝的功能化(gamma-Al2O3)增加活动1, 2-propanediol脱水

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摘要

gamma-Al2O3 was functionalized with trimethylsilyl (TMS) and evaluated as a catalyst for 1,2-propanediol dehydration. TMS-coated catalysts demonstrated a similar to 50% activity increase compared with the native uncoated alumina catalyst. Results from kinetic studies indicated similar activation barriers, rate laws, and deactivation profiles for uncoated and coated catalysts, suggesting that the increased rate of dehydration was not caused by an alternative mechanism, but rather by an increase in the effective number of active sites available on the TMS-functionalized surface. However, the apparent concentration of acid and base sites on the coated catalyst measured by base/acid adsorption decreased when compared with the native catalyst. Temperature programmed reaction spectroscopy (TPRS) studies suggested that binding of 1,2-propanediol on the coated catalysts was much weaker than on the native catalyst, with a desorption energy similar to that of 2-propanol. When the monofunctional alcohols 1-propanol and 2-propanol were used as reactants, the TMS coating decreased the catalyst activity, suggesting that the coating served mainly to favour binding of diols in a monodentate configuration that is invoked in the E2-like concerted dehydration mechanism.
机译：gamma-Al2O3与三甲基硅烷基官能团(TMS)和评估作为催化剂1, 2-propanediol脱水。演示了一个类似于活动增加50%相比之下,本机裸铝催化剂。类似的活动障碍,速率定律,失活档案裸和涂层催化剂,表明增加的速度脱水并非由于另一种机制,而是通过增加有效的活动网站上可用的数量TMS-functionalized表面。酸和碱的浓度网站涂用碱/酸吸附催化剂与本机催化剂相比下降。温度设定反应谱(tpr)研究表明,绑定的1, 2-propanediol涂层催化剂得多弱于本机催化剂上,解吸能源与丙胺相似。当单功能的醇1-propanol和丙胺作为反应物,经颅磁刺激涂层催化剂活性下降,这表明涂层主要服役支持绑定monodentate的二醇E2-like配置调用共同脱水机制。

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