Facile Method for the Synthesis of Phosphomolybdic Acid Supported on Zirconia–Ceria Mixed Oxide and Its Catalytic Evaluation in the Solvent-Free Oxidation of Benzyl Alcohol
Facile Method for the Synthesis of Phosphomolybdic Acid Supported on Zirconia–Ceria Mixed Oxide and Its Catalytic Evaluation in the Solvent-Free Oxidation of Benzyl Alcohol
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DOI：
10.1021/ie2022724
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发表时间：
2012-06
影响因子：
4.2
通讯作者：
S. Mallick;Surjyakanta Rana;K. Parida
中科院分区：
文献类型：
--
作者：
S. Mallick;Surjyakanta Rana;K. Parida
采用浸渍法制备了一系列磷钼酸（5-20 wt % PMA）促进的氧化锆-二氧化锆（ZrO2-CeO2）混合氧化物，并用XRD、氮气吸附/脱附、UV-vis DR光谱、TPR/TPD和31P MAS NMR对其进行了表征。核磁共振谱显示，催化剂在500℃煅烧后仍保持PMA的Keggin结构。筛选了以过氧化氢为氧化剂的苯甲醇无溶剂液相氧化催化剂。15 wt % PMA/ ZrO2-CeO2样品对相应醛的转化率为85%，选择性为96%。
A series of phosphomolybdic acid (5–20 wt % PMA) promoted zirconia–ceria (ZrO2–CeO2) mixed oxides were synthesized by an impregnation method and characterized by XRD, nitrogen adsorption/desorption, UV–vis DR spectroscopy, TPR/TPD, and 31P MAS NMR spectroscopy. NMR spectra revealed that the catalyst retained the Keggin structure of PMA even after calcination at 500 °C. The catalysts were screened for the solvent-free liquid-phase oxidation of benzyl alcohols using hydrogen peroxide as the oxidizing agent. The sample of 15 wt % PMA/ZrO2–CeO2 showed 85% conversion and 96% selectivity to the corresponding aldehydes.