Preparation And Properties Of Titanium Based Catalyst Supported With Metallic Oxides For De-NO_x

In recent years, with the rapid development of industry and economy, a lot of fuel combustion and vehicles exhaust more nitrogen oxides and thus induce severe harm. Nitrogen oxides?NO_x? are one of the main pollutants in acid rain, ozone depletion and photochemical smog, and have a lot of harm on the natural environment and human health. The commercial technology for NO_x control is the selectively catalytic reduction?SCR? of NO_x with NH₃. The core technology of NH₃-SCR is the catalyst, the most widely used catalyst is the Vanadium-based catalysts. The most widely catalyst used in the Selective Catalytic Reduction catalysts are vanadium catalysts with poor resistance with SO₂ and honeycomb low temperature catalyst of poor performance.Many researchers focus on the development of vanadium-free NH₃-SCR catalysts which is novel, highly efficient, stable, environmental-friendly. In this thesis, we use Titanium based catalysts as raw material and then supported with metal oxide as active component, thus a series denitration catalysts are prepared. In this paper, different catalysts were prepared by hydrothermal treatment method, co-precipitation method, impregnation method and mechanical mixing method. Modified Titanium-based catalysts for single metal cerium and for double metal zirconium and cerium. In this paper, the effect of preparation methods on the performance of the catalyst was investigated. By comparing the four methods of hydrothermal treatment method, co-precipitation method, impregnation method and mechanical mixing method, we find the optimal preparation method is the co-precipitation method. In this paper, we used the single metal or two metals to modify Titanium-based catalyst. Through the test of catalysts, the activity of CeTi-COP reached 99% in 350? and the activity of Zr_0.03Ce_0.07Ti_0.9O₂ reached 95.7% in 350?. The doping of metal cerium and zirconium improve Titanium-based catalyst on the denitrification activity and selectivity.The morphology and microstructure of catalysts are characterized by XRD, BET, XRF characterization techniques. The redox properties of samples are tested by H2 temperature-programmed reduction technology. The mechanism and structure-functional relationship are measured by in situ infrared analyzes.In this paper, the two kinds of modified Titanium-based catalysts with excellent performance, high selectivity, and good water and sulfur resistance were prepared. In the future, the development of NO_x reduction catalysts should be focused on the life of catalysts and the development of low cost, high efficiency and good stability.