CuO-ZnO-MnOx/Al2O3催化剂上α,α-二甲基苄醇氢解制备异丙苯

Petrochemical Technology(2010)

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Abstract
采用沉积沉淀法制备了CuO-ZnO/Al2O3和CuO-ZnO-MnOx/Al2O3催化剂.利用XRD、低温N2吸附、H2-TPR等手段对两种催化剂进行了表征.表征结果显示,Mn物种的引入不仅有效促进了Cu组分的分散,且能增强Cu的抗烧结能力,提高了活性组分的稳定性.利用常压高空速的催速失活实验对两种催化剂催化α,α-二甲基苄醇(DMBA)氢解的性能进行了比较,实验结果表明两种催化剂的初始活性相当,但CuO-ZnO-MnOx/Al2O3催化剂的稳定性更高.在入口温度170 ℃、出口温度220 ℃、H2压力2.0 MPa、氢油体积比400、LHSV 1.0 h-1的条件下,用Mn与Cu摩尔比为0.2的CuO-ZnO-MnOx/Al2O3催化剂催化反应1 000 h,DMBA完全转化,异丙苯选择性大于96%.
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Key words
copper-based catalyst,propylene oxide,alumina,α-dimethyl-benzyl alcohol,cumene,manganese oxide,hydrogenolysis,α
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