新型V2O5/TiO2-石墨烯复合催化剂的制备及其低温脱硝机理研究

项目名称： 新型V2O5/TiO2-石墨烯复合催化剂的制备及其低温脱硝机理研究

项目编号： No.51506155

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 能源与动力工程

项目作者： 金伟

作者单位： 武汉理工大学

项目金额： 21万元

中文摘要： 燃煤造成大量的NOx排放，是造成大气污染的主要来源之一，给人类生存环境带来巨大危害。选择性催化还原技术作为比较成熟且高效的烟气脱硝技术已得到广泛的应用，但商用的钒钛系催化剂的活化温度较高且温度窗口较窄，不利于现有脱硝工程的改造。因而亟待研究和开发低温抗中毒能力强的催化剂。石墨烯作为一种新型碳材料具有比表面积大、电导率高等特点，有利于提高催化剂的氧化还原性及催化还原能力。因此，本项目将石墨烯与钒钛催化剂进行复合，以提高活性物质的分散性增强气体吸附，加快反应速率，达到降低催化剂活性温度的目的。同时将催化剂的热催化与光催化相结合，实现催化剂的低温高效脱硝，并探明机理，为我国烟气脱硝的发展提供科学理论依据。

中文关键词： 钒钛催化剂；石墨烯；氮氧化物；低温SCR；微观反应机理

英文摘要： Nitrogen oxides emitted from the burning of fossil fuels and mobile and stationary sources is one of the main atmospheric pollutants that leads to a lot of environmental problems. Selective catalytic reduction (SCR) of NOx by NH3 in the presence of oxygen is one of the most effective methods to decrease the NOx levels in gaseous emissions. A well-known commercialized catalyst for this process is V2O5/TiO2. However, there are still some inevitable problems with this catalyst system including the toxicity of vanadium species, the narrow temperature window of 300-400 °C, and this go against the denitration engineering reform. So it is very necessary to develop a low-temperature SCR process and catalysts. Graphene (GE) as a new carbon nanomaterial has many exceptional properties, such as high electron mobility, and large theoretical specific surface area. The high-efficiency process of the gain and loss of electrons has resulted in the improvement of the redox performance and the catalytic reduction ability of the catalyst. Therefore, in this work, GE will be introduced into V2O5/TiO2 catalyst to improve the loading of the active component (V2O5), increase the adsorption of NH3 and the reaction ratio, while the low temperature catalytic activity will be enhanced. Meanwhile, in order to achieve and enhance the ability to improve the SCR performance at low temperature, thermal catalysis and photo catalysis of the composites catalysts will be combined. And by these, this work will put forward the mechanisms and provides a scientific theory basis for the development of our country’s gas denitration technologies.

英文关键词： V2O5/TiO2 catalyst;graphene;NOx;low-temperature SCR;micro-reaction mechanism