Heterogeneous CaO-ZrO₂ acid-base bifunctional catalysts for vapor-phase selective dehydration of 1,4-butanediol to 3-buten-1-ol

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• 作者：Qian Zhang ; Yin Zhang ; Haitao Li ; Chunguang Gao ; Yongxiang Zhao
• 关键词：1 ; 4-Butanediol ; 3-Buten-1-ol ; Dehydration ; CaO-ZrO2 acid&ndash ; base bifunctional catalyst ; Ca&ndash ; O&ndash ; Zr Hetero-linkage
• 刊名：Applied Catalysis A: General
• 出版年：2013
• 出版时间：10 September, 2013
• 年：2013
• 卷：466
• 期：Complete
• 页码：233-239
• 全文大小：1827 K

文摘

A series of acid-base bifunctional CaO-ZrO₂ catalysts was prepared simply by the impregnation method and evaluated for the vapour-phase dehydration of 1,4-butanediol (BDO). The effects of CaO content and calcination temperature on the catalytic properties of the CaO-ZrO₂ catalysts were investigated. It was found that the catalyst with 12.5 wt % CaO and at a calcination temperature of 650 ¡ãC exhibited favorable catalytic performance and good stability for the selective dehydration of BDO to 3-buten-1-ol (BTO). The maximum BTO selectivity and BDO conversion reached 68.9 % and 94.6 % , respectively. The formation of by-product, THF, was markedly suppressed. These catalysts were characterized by N₂ physisorption, XRD, FT-IR spectra, NH₃-TPD and CO₂-TPD. The results indicated that the CaO-ZrO₂ catalysts showed higher basicity density and similar acidity density compared to unmodified ZrO₂ due to the formation of Ca-O-Zr Hetero-linkage by CaO introduction. The catalytic performance depended on the coexistence of acidic and basic sites on the surface of catalysts.