Partial Oxidation of Toluene on VOx-TiOx/SBA-15
Partial Oxidation of Toluene on VOx-TiOx/SBA-15
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VOx-TiOx/SBA-15 上甲苯的部分氧化
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发表时间：
2009
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采用接枝法制备了一系列VOx-TiOx/SBA-15催化剂。采用n2吸附、TPR、UV-Vis和NH3-TPD等不同技术对催化剂进行表征，以验证钒和钛的种类，并研究其对甲苯部分氧化的催化性能。结果表明：低负荷时，钒主要以孤立的四面体和八面体形态存在；一定量钛的加入改善了钒在载体上的分散，从而提高了相同钒含量下对甲苯氧化的催化性能。随着钛用量的增加，甲苯转化率和苯甲醛选择性均达到最大值，然后逐渐降低。
A series of VOx-TiOx/SBA-15 catalysts was prepared by the grafting method. The catalysts were characterized by different techniques such as N2-sorption, TPR, UV-Vis and NH3-TPD in order to verify the vanadium and ti-tanium species, and their catalytic properties were investigated for the partial oxidation of toluene. The results show that vanadium mainly existed in the forms of isolated tetrahedral and octahedral species at the low loadings. The introduction of a certain amount of titanium improved the dispersion of vanadium on the support and then the catalytic performance for toluene oxidation at the same vanadium content. Both toluene conversion and benzaldehyde selectivity, showed the maximum values and then decreased with increasing the amount of titanium in the catalyst.