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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >SELECTIVE OXIDATION OF TOLUENE OVER V2O5/TIO2 CATALYSTS - EFFECT OF VANADIUM LOADING AND OF MOLYBDENUM ADDITION ON THE CATALYTIC PROPERTIES
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SELECTIVE OXIDATION OF TOLUENE OVER V2O5/TIO2 CATALYSTS - EFFECT OF VANADIUM LOADING AND OF MOLYBDENUM ADDITION ON THE CATALYTIC PROPERTIES

机译：V2O5 / TIO2催化剂上甲苯的选择性氧化-钒载量和钼的添加对催化性能的影响

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摘要

The influence of vanadium loading and molybdenum presence on the catalytic performance of vanadia-titania (anatase) catalysts for the selective oxidation of toluene was investigated, Two series of V2O5/TiO2 and V2O5-MoO3/TiO2 catalysts were prepared. In the first series the loading of vanadium varied from 0 to 8 mole %, whereas in the second the atomic ratio V/(V+Mo) varied from 0 to 1 while the total loading of active elements (V+Mo) was kept constant and equal to 8 mole %. The samples were characterized by XPS, TPR, XRD and BET measurements. It was found that the activity for the oxidation of toluene and the selectivity for side chain partial oxidation products (benzaldehyde and benzoic acid) exhibited by V2O5/TiO2 catalysts increased with the vanadium loading up to monolayer coverage. This increase was attributed to the parallel increase of the surface concentration of easily reducible isolated vanadium species interacting with the anatase surface. When the vanadium content increased above monolayer coverage both activity and selectivity decreased. V2O5-MoO3/TiO2 catalysts were found to be less active and selective than the corresponding V2O5/TiO2 ones. Molybdenum species supported on anatase were less active for this reaction than vanadium and, in addition, the presence of molybdenum inhibited the interaction between vanadium and anatase leading to a poor vanadium dispersion. [References: 49]
机译：研究了钒的负载量和钼的存在对钒钛催化剂的催化性能的影响，制备了两种系列的V2O5 / TiO2和V2O5-MoO3 / TiO2催化剂。在第一个系列中，钒的负载量从0到8摩尔％变化，而在第二个系列中，原子比V /（V + Mo）从0到1变化，而活性元素的总负载（V + Mo）保持恒定等于8摩尔％。通过XPS，TPR，XRD和BET测量对样品进行表征。已经发现，V2O5 / TiO2催化剂表现出的对甲苯的氧化活性和对侧链部分氧化产物（苯甲醛和苯甲酸）的选择性随钒负载量的增加而增加，直至达到单层覆盖率。这种增加归因于与锐钛矿表面相互作用的易还原的分离钒物种的表面浓度的平行增加。当钒含量增加到单层覆盖率以上时，活性和选择性均降低。发现V2O5-MoO3 / TiO2催化剂的活性和选择性低于相应的V2O5 / TiO2催化剂。锐钛矿上负载的钼物种对该反应的活性低于钒，并且，钼的存在抑制了钒与锐钛矿之间的相互作用，导致钒的分散性差。 [参考：49]

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