ZrO2-SiO2 Mixed Oxides Xerogel and Aerogel as Solid Acid Catalysts for Solvent Free Isomerization of α-Pinene and Dehydration of 4-Methyl-2-Pentanol
ZrO2-SiO2 Mixed Oxides Xerogel and Aerogel as Solid Acid Catalysts for Solvent Free Isomerization of α-Pinene and Dehydration of 4-Methyl-2-Pentanol
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DOI：
10.1007/s10562-011-0602-6
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发表时间：
2011-08-01
影响因子：
2.8
通讯作者：
Jasra, Raksh V.
中科院分区：
文献类型：
--
作者：
Sidhpuria, Kalpesh B.;Tyagi, Beena;Jasra, Raksh V.
考察了不同Zr/Si摩尔比的硫酸化和非硫酸化的氧化锆-二氧化硅混合氧化物干凝胶和气凝胶作为固体酸催化剂催化α-蒎烯异构化和4-甲基-2-戊醇脱水反应的性能。硫酸盐化提高了干凝胶和气凝胶样品对所研究反应的催化活性。例如，硫酸化催化剂对α-蒎烯的转化率为86-98%，对4-甲基-2-戊醇的转化率为8-35%。樟烯和柠檬烯的选择性数据表明，催化剂需要中等酸度。与环己醇脱水反应的关联表明，α-蒎烯的异构化反应是Bronsted酸催化的反应。4-甲基-2-戊醇转化率与酸中心密度和单位面积硫含量呈线性关系。
Sulfated and non-sulfated ZrO2-SiO2 mixed oxide xerogel and aerogel samples having varied Zr/Si molar ratio were evaluated as solid acid catalysts for the isomerization of alpha-pinene and dehydration of 4-methyl-2-pentanol. Sulfation resulted into enhancement in the catalytic activity of both xerogel and aerogel samples towards the studied reactions. For example, sulfated catalysts showed 86-98% conversion of alpha-pinene and 8-35% conversion of 4-methyl-2-pentanol. The selectivity data for camphene and limonene indicated the requirement of moderate acidity. The correlation with cyclohexanol dehydration showed that isomerization of alpha-pinene is a Bronsted acid catalyzed reaction. The relationship of 4-methyl-2-pentanol conversion with acid site density and sulfur per unit area was found to be linear.