Mesoporous V-KIT-6 catalysts with different Si/V ratios of 25,50,75 and 100 were synthesized by hydrothermal method under the controlled acidic conditions and characterized by using low angle XRD, ICP-OES, Diffuse reflectance UV–vis, SEM and TEM analysis. The characterization results are confirmed that most of the vanadium was mainly incorporated in the form of an isolated tetrahedral environment with terminal VO bond units.

The synthesized catalysts were tested for the vapour phase selective oxidation of diphenylmethane (DPM) using air as an oxidant. A detail kinetic study was carried out on V-KIT-6 (25) catalyst using Langmuir–Hinshelwood (LH) model. The combined studies of Langmuir–Hinshelwood (LH) model and transition state theory (TST) explain that the reaction follows a second-order rate expression with respect to surface coverage of DPM and molecular oxygen. The reaction data derived from the LH modeling is allowed us to calculate the true activation energy and activation entropy of the reaction. The nature of transition state was determined from transition state theory and possible reaction mechanism was proposed for this reaction.

在控制的酸性条件下，通过水热法合成了不同Si / V比为25、50、75和100的介孔V-KIT-6催化剂，并采用低角度XRD，ICP-OES，漫反射UV-vis，SEM进行了表征。和TEM分析。表征结果证实，大多数钒主要以具有末端V O键单元的孤立四面体环境的形式掺入。

使用空气作为氧化剂，测试了合成的催化剂对二苯甲烷（DPM）的气相选择性氧化。使用Langmuir-Hinshelwood（LH）模型对V-KIT-6（25）催化剂进行了详细的动力学研究。Langmuir-Hinshelwood（LH）模型和过渡态理论（TST）的组合研究表明，该反应遵循DPM和分子氧的表面覆盖率的二级速率表达。从LH建模中获得的反应数据使我们能够计算反应的真实活化能和活化熵。根据过渡态理论确定了过渡态的性质，并提出了可能的反应机理。