Modified titanium dioxide catalyst with special morphology and its preparation method and application

Abstract

The invention discloses a modified titanium dioxide catalyst with special morphology and its preparation method and application. The method comprises: mixing diethylenetriamine, titanium tetraisopropoxide, niobium pentachloride and isopropanol High-temperature hydrothermal reaction is carried out, and the catalyst carrier is obtained after the product is separated, washed, dried and calcined. Subsequently, the active component is doped with active metal nitrate to prepare a modified titanium dioxide catalyst with special morphology. The catalyst prepared by the invention can be applied to the selective catalytic reduction of nitrogen oxides by ammonia. The catalyst exhibits high nitrogen oxide conversion, nitrogen selectivity, wide reaction temperature window, and excellent resistance to sulfur dioxide, water vapor, and alkali metal poisoning. The special morphology / structure can effectively reduce the amount of modifying elements, The production cost is well reduced, and the catalytic system is non-toxic to the environment and the human body, and has good industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of titanium dioxide catalysts, in particular to a titanium dioxide catalyst with special morphology, its preparation method and application. Background technique [0002] With the development of economy and the advancement of science and technology, more and more people pay attention to environmental issues. Air pollution and control, as the main components of environmental issues, have attracted the favor of many researchers. Nitrogen oxides (NO x ) is one of the main pollutants in the atmosphere. It mainly comes from two categories: fixed emission sources such as coal-fired power plants, waste incineration plants and industrial furnaces, and mobile emission sources such as diesel vehicle exhaust. At the same time, NO x It can cause a series of problems such as photochemical smog, acid rain, the hole in the ozone layer, and endanger the human respiratory system. Therefore, controlling NO in the atmospher...

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Problems solved by technology

This type of catalyst has high reactivity, wide reaction temperature window, and good resistance to sulfur dioxide poisoning; however, it is easy to dealuminate the molecular sieve carrier framework under high temperature hydrothermal conditions, collapse and deactivate the catalyst

[0006] Noble metal SCR catalysts refer to catalysts with Pt, Ag, Pd, Rh and other noble metals as active components. This type of catalyst has high low-temperature reaction activity, and can use carbon hydrocarbon (HC) organic gases as reducing substances to reduce NO x Catalytic reduction has strong resistance to water vapor and sulfur dioxide poisoning, and the three-way catalytic effect is better; however, the reaction window of this type of catalyst is relatively narrow, and the defects of high preparation cost limit its further industrial application.

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