Influence About Electronic Modulation Of TiO₂ Nanotubes For Confined Catalytic Combustion

The pollution of volatile organic compounds（VOCs）to the atmospheric environment is becoming increasingly serious,which affects people’s health and life deeply.The method of catalytic combustion,due to efficient-cleaning and non-secondary pollution,has become an effective way to remove VOCs.At present,the main problem of its application is that the existing catalyst activity of catalytic combustion method can not meet the requirements of treating low concentration organic waste gas,and the catalyst has a certain life-span.So the election of catalyst in the catalytic combustion is the fundamental problem that restricts the application of the technology.It is of great significance to select the catalysts with low price,good catalytic activity and good thermal stability.In view of the existing problems of the method of catalyst in the catalytic combustion,with the supporting of the Natural Science Foundation of Guangdong,the thesis in this paper involes several aspects as described below:anatase TiO₂ nanotubes with high thermal stability was prepared as the catalyst carrier by controlling the heat treatment process of hydrotheramlly synthesized Ti O₂ nanotubes;prepared CuO modified TiO₂ nanotubes confined CeO₂ catalyst by vacuum assisted impregnation method;anatase/rutile mixed-phase TiO₂ nanotubes were prepared by hydrothemal synthesis,with the liquid phase deposition adjusting the phase ratio of anatase to rutile as the catalyst carrier,the mixed crystal nanotubes confined CeO₂ catalyst was prepared.The prepared catalyst was used for the catalytic combustion test of butane,and the research on the catalytic combustion performance based on the electronic characteristic modulation was carried out.To explore different types of electron transfer,the change in catalytic performance and the improvement of catalytic activity.The butane catalytic combustion experiment results show that the CeO₂ catalyst compared to the non confined one,CuO modified confined catalysts can effectively reduce the ignition temperature of butane,isobutane conversion efficiency at 280℃has reached 90%;mixed crystal confined catalyst reduces the ignition temperature of 20℃butane in the butane burning,effectively reduce the activation energy required during combustion of butane.It is proved that the prepared confined catalyst can catalyze combustion to reduce the combustion temperature of the reactant.With the help of XRD,TEM,XPS,BET,H₂-TPR and a series of characterization methods,we knew the crystal type of catalyst,the material prepared by the morphology,surface area,reduction properties and electronic valence.It also explained the reasons for the reasons about catalytic activity increasing among the prepared confined catalyst.We knew the confinement mechanism about the catalytic combustion of confinement.It has a certain reference value for the study of the catalytic performance of the confined catalyst.