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钼掺杂K-OMS-2催化大豆油环氧化反应
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摘要
以高锰酸钾、硫酸锰和钼酸钠为起始原料,采用一步回流法制备不同钼锰比的钼掺杂K-OMS-2催化剂。利用X射线粉末衍射(XRD)、透射电镜(TEM)、程序升温还原(H2-TPR)、吡啶红外等方法对催化剂进行了表征。在不使用溶剂的条件下,以叔丁基过氧化氢为氧源,考察了钼掺杂催化剂在大豆油环氧化反应中的性能。结果表明:钼成功的掺杂进K-OMS-2的晶体结构中,不是简单的附着OMS-2的表面以单独的氧化钼存在;钼掺杂量的改变影响了催化剂棒状结构长宽比,催化剂氧化还原性能和表面酸性同时也发生了改变;相比于其它比例的催化剂,钼锰比为1:100的催化剂具有强的Lewis酸性和较弱的氧化性,以它为催化剂对大豆油进行的环氧化反应所得的产品具有最高的环氧值1.382。
The performance of Mo-doped manganese oxides prepared by the single-step reflux method has been investigated in the epoxidation of soybean oil with tert-butyl hydroperoxide as the oxidant. The catalysts were characterized by XRD, TEM, H_2-TPR and DRIFT spectroscopy of adsorbed pyridine. The characterization results indicated the successful incorporation of Mo dopant in the structure of K-OMS-2 rather than the local segregation of molybdenum oxide species. The catalyst with Mo/Mn molar ratio=1:100 has relatively strong Lewis acid character and relatively weak oxidizability. And the highest epoxy value of the products in catalyzed epoxidation of soybean oil reached 1.382.
引文
[1]Chen,C.H.;Njagi,E.C.;Chen,S.Y.;Horvath,D.T.;Xu,L.,Inorganic chemistry 2015,54(21),10163-71.
    [2]Di Serio,M.;Turco,R.;Pernice,P.;Aronne,A.;Sannino,F.,Catalysis Today 2012,192(1),112-116.

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