Syntheses and characterizations of cobalt doped mesoporous alumina prepared using natural rubber latex as template and its catalytic oxidation of tetralin to tetralone
Syntheses and characterizations of cobalt doped mesoporous alumina prepared using natural rubber latex as template and its catalytic oxidation of tetralin to tetralone
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DOI：
10.1016/j.apcata.2011.02.001
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发表时间：
2011-04
影响因子：
5.5
通讯作者：
Yongping Ma;Muling Zeng;Jiao He;Lina Duan;Jianfei Wang;Junjie Li;Jiaqiang Wang
中科院分区：
文献类型：
--
作者：
Yongping Ma;Muling Zeng;Jiao He;Lina Duan;Jianfei Wang;Junjie Li;Jiaqiang Wang
天然橡胶胶乳是一种重要的生物合成高分子材料，以其为模板成功地合成了钴掺杂的介孔氧化铝。采用N2吸附/脱附、漫反射UV-vis、X射线衍射和FT-IR等手段对所合成的钴掺杂介孔氧化铝进行了表征，并首次将其用于四氢萘氧化合成1-四氢萘酮的反应中。该催化剂具有较高的底物转化率（80.3%）和良好的产物（1-四氢萘酮）选择性（74.5%）。催化剂的快速热过滤实验证明，该催化剂是一种多相催化剂，可重复使用三次而不失去活性。相比之下，以橡胶胶乳为模板合成的未掺杂氧化铝、以传统化学模板聚环氧乙烷-嵌段-聚环氧丙烷-嵌段-聚环氧乙烷（P123）为模板合成的钴掺杂氧化铝和以天然橡胶胶乳为模板合成的钴掺杂介孔氧化硅的活性要低得多。
Natural rubber latex, one of the most important biosynthesized polymers, was successfully used as template in the syntheses of cobalt doped mesoporous alumina. The synthesized cobalt doped mesoporous alumina was characterized by a combination of various physicochemical techniques; N2adsorption/desorption, diffuse reflectance UV–vis, X-ray diffraction and FT-IR. It was used as an efficient catalyst for the oxidation of tetralin to 1-tetralone under mild conditions for the first time. The catalyst exhibited high substrate conversion (80.3%) and good product (1-tetralone) selectivity (74.5%). Fast hot catalyst filtration experiments proved that the catalyst acted as a heterogeneous one; it can be reused three times without losing its activity. By contrast, undoped alumina synthesized using rubber latex as template, cobalt-doped alumina synthesized by a using traditional chemical template: poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (P123) as template, and cobalt-doped mesoporous silica synthesized by using natural rubber latex as template exhibited much lower activities.