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硫酸镓/凹凸棒石黏土固体酸催化剂的制备及其催化性能

DOI: 10.7521/j.issn.0454-5648.2014.07.21

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Abstract:

采用凹凸棒石黏土负载硫酸镓(Ga2(SO4)3)制备了Ga2(SO4)3/凹凸棒石黏土固体酸催化剂,采用红外光谱及X衍射光谱等对催化剂结构进行了表征。通过乳酸丁酯的合成考察了催化剂的较优制备条件和催化性能,并对相应催化反应进行了动力学研究。结果表明催化剂的较优制备条件是凹凸棒石黏土经1.2mol/L硫酸溶液酸化处理,Ga2(SO4)3负载量为5.7%,焙烧温度350℃,焙烧时间2.5h。在较优酯化反应条件下,平均酯化率为95.5%。动力学研究表明反应为准一级反应,表观活化能为45.072kJ/mol,378K时反应速率常数为2.35×10-2min-1。

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