MnTiO2在不同煅烧温度下的脱汞究毕业说明书.docx

摘要燃煤电站烟气汞排放是环境中主要的汞污染之一，已经得到越来越多的关注。在各种烟气汞排放控制中，利用金属催化剂来脱除烟气汞是主要的方法之一，而且越来越受到良好的效果。金属脱汞是一个比较前沿的研究项目，它的前景十分广阔。催化剂是通过共沉淀法将硝酸锰负载到TiO2上。当煅烧温度达到400℃时，脱汞活性最大达到98%。通过比表面积表征，N2吸附解吸附，X射线衍射分析，扫描电子显微原理分析，程序升温还原技术分析和X射线透光率分析等方法对催化剂进行表征。催化剂的最好活性归因于MnOx很好的分散在催化表面和锰的形态，MnOx的分散可使表面积增加。在较低温度下，MnO2沉积在催化剂上，之后转变为Mn2O3，在较高温度下它又转化为Mn3O4。我们的研究发现，催化剂表面的Mn3+大大提高了脱汞活性。本文对Mn/TiO2在不同煅烧温度下的脱汞进行研究。催化剂利用共沉淀法制备。研究的主要目的是寻求最佳煅烧温度，以及不同温度下锰的形态与催化活性间的关系。在经过一系列实验之后，可以得出：Mn/TiO2这种催化剂对于电厂脱汞具有比较明显的效率。但是，这也受到温度和环境条件的限制。因此，积极寻找更有效的脱汞方式是势在必行的提高电厂效率的措施所在。关键词：脱汞金属吸附表征分析锰二氧化钛ABSTRACTCoal-fired power plant emissions of mercury in flue gas is one of the main mercury pollution in the environment, which has got more and more attention. In a variety of mercury emissions from flue gas control, using metal catalyst to remove mercury in the flue gas is one of the main ways.And it will get more and more good results. Metal mercury removaling is an advanced research project, which is very broad prospects.Catalyst is by coprecipitation method and the nitrate load to the TiO2. When the calcination temperature is reached to 400 ℃, mercury removal activity reaches a maximum of 98%. Through the BET, N2 physisorption, XRD, SEM, TPR and XPS method ,we work for characterization of the catalyst. The best activity of the catalyst is attributed to the MnOx well dispersed in the catalyst surface and the morphology of the manganese. MnOx dispersion can make the surface area increased. At lower temperature, MnO2 deposits on the catalyst, then changs to Mn2O3. At higher temperatures, it deposits into Mn3O4. Our study found that the surface of the catalyst Mn3+ can greatly improve the mercury removal activity.Study on mercury removal is by Mn/TiO2 at different calcination temperatures. Coprecipitation method is by using catalyst. The main purpose of the research is to seek the best calcining temperature and the relationship between morphology and catalytic activity of different temperature between manganese.After a series of experiments,