Catalyst for removing nitric oxide in flue gas under low temperature, and preparation method and application thereof

Abstract

The invention discloses a catalyst for removing nitric oxide in flue gas. The catalyst is a supported V2O5-CeO2 / TiO2 catalyst, the catalyst adopts anatase titanium dioxide of which a 001 crystal face is preferentially exposed as a supporter, Ce and V are supported in sequence by using an impregnation method, and the catalyst contains the following components in percentage by mass: 1 to 10 percent of CeO2 and 1 to 10 percent of V2O5. The catalyst has good denitration activity within medium and low temperature ranges (200 to 300 DEG C), the NO conversion ratio is up to 90 percent, the conversion ratio is nearly 100 percent, and the catalyst has good water resistance and sulfur resistance. The invention discloses a preparation method thereof.

Description

Technical field: [0001] The present invention relates to a load type V 2 o 5 -CeO 2 / TiO 2 Catalyst and its application in removing nitrogen oxides from flue gas. Background technique: [0002] Nitrogen oxides (including NO 2 and NO) are one of the main air pollutants, which can cause serious environmental problems, including acid rain, photochemical smog, ozone depletion and greenhouse effect, and cause serious harm to human health and plant growth. Nitrogen oxides mainly come from the combustion of stationary source fossil fuels, such as industrial boilers, power stations, waste incinerators, gasifiers, engines, and gas boilers. [0003] Among the flue gas denitrification technologies currently used in thermal power plants, Selective Catalytic Reduction (SCR) is currently the most widely used, most efficient, and mild operating condition. widely used. Catalyst activity temperature window, denitrification efficiency, N 2 Selectivity, sulfur resistance, water resista...

AI Technical Summary

Problems solved by technology

This type of catalyst has good denitrification ability and sulfur resistance, but there are still many problems when it is applied to the flue gas denitrification system: V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 The active temperature range of the catalyst is 300°C to 400°C. Therefore, due to the limitation of the working temperature, the flue gas denitrification system needs to be installed between the boiler and the air preheater, but the reaction gas at this time has not been treated by electrostatic dust removal and desulfurization. The flue gas contains a large amount of dust, alkali metal, SO 2 etc., it is easy to cause the catalyst to lose its activity due to pore blockage and poisoning

However, manganese-based catalysts have poor sulfur resistance, so they have not been able to achieve industrial applications.

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