Novel rare earth modified aerogel catalyst for flue gas denitrification and preparation method thereof

Abstract

The invention discloses a rare earth modified aerogel catalyst for flue gas denitrification and a preparation method thereof, belonging to the field of novel non-toxic catalyst materials for flue gasdenitrification. The preparation method comprises the following steps: firstly, carrying out vacuum roasting treatment on a carrier, namely silicon dioxide aerogel to remove moisture and volatile impurities in the carrier; preparing a rare earth carrier solution with a certain concentration, adding a solution with an amount equivalent to a saturated adsorption quantity into a sample according to asample amount, conducting quick stirring for a certain period of time, uniformly dispersing the solution on the carrier, and carrying out standing; and carrying out microwave drying and rapid dryingon the sample after standing, placing the dried sample in a muffle furnace, and conducting calcining for a period of time under the protection of nitrogen to obtain the catalyst. The catalyst has lowtoxicity and high efficiency, is applicable to flue gas denitrification for thermal power plants and steel works, can be used for catalytic purification of nitrogen oxides in tail gas of heavy dieselvehicles, nitric acid plants and the like, and has very high conversion rate and removal rate.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a rare earth modified airgel denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ), as one of the air pollutants, will cause serious harm to the ecological environment, mainly including nitric oxide (NO) and nitrogen dioxide (NO 2 ). Nitrogen oxide pollution has the characteristics of great harm and difficult elimination, and all countries in the world have included it in the scope of governance. Nitrogen oxides mainly come from man-made sources, namely fuel combustion and chemical industry, etc., such as thermal power plants, ironworks, chemical plants and other fixed sources with fuel combustion, mobile sources such as automobiles, and intermediate products produced in industrial processes, etc. . The amount of nitrogen oxides emitted from the above sources accounts for more than 90% of the total man-made emissions, a...

AI Technical Summary

Problems solved by technology

Catalysts used in domestic SCR units that have been put into operation and are about to be put into operation basically rely on foreign imports, and foreign denitrification companies often sell denitrification process packages and catalysts in a bundled manner, which undoubtedly increases the cost of catalysts