Co oxide/BaCO3 catalyst for N2O catalytic decomposition and preparation method thereof

Abstract

The invention discloses a Co oxide / BaCO3 catalyst for N2O catalytic decomposition and a preparation method thereof. The catalyst uses BaCO3 or a mixture of the BaCO3 as a carrier; the Co oxide mainly exists on the surface of the BaCO3 carrier to form a Co oxide enrichment shell layer; the Ba / Co atomic ratio in the catalyst is greater than 0.5. The catalyst obtained by a preparation technology has the characteristics that (1) the specific surface of the catalyst is obviously higher than that of the BaCO3 carrier per se; (2) the high activity of the Co oxide on the N2O catalytic decomposition can be fully utilized, so that the cost of the catalyst is reduced; (3) the catalytic activity of the N2O decomposition is obviously higher than that of a catalyst, with identical composition, obtained by an impregnation method and a coprecipitation method.

Description

technical field [0001] The invention belongs to the technical field of environmental protection catalytic materials and air pollution control, and relates to a method for preparing N 2 O-catalyzed decomposition of shelled Co oxide / BaCO with high activity 3 Catalyst preparation techniques. Background technique [0002] N 2 O is produced in large quantities in the production engineering of adipic acid and nitric acid. Hydrocarbon selective catalytic reduction (HC-SCR) and hydrogen selective catalytic reduction (H 2 -SCR) process, also can produce N because of the selectivity of noble metal catalyst is not high 2 O. N 2 O is a far better than NO x more toxic and far more toxic than CO 2 and CH 4 Gases with a stronger greenhouse effect. In order to protect the atmospheric environment, the N produced in the above process must be 2 O is effectively eliminated. [0003] Effectively eliminate N in the above exhaust gas 2 One of the methods for O is to increase the above-...

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Problems solved by technology

[0030] Because the mass percentage content of Co oxide in the above-mentioned catalyst is too high, the catalytic effect of Co oxide in the catalyst cannot be fully exerted, and the cost is too high; or because the content of alkaline earth metal in the above-mentioned catalyst is too low, it cannot be prepared by the method of adsorption deposition Catalysts with efficient enrichment of Co oxides on the catalyst surface

[0031] To date, there is no BaCO 3 Catalyst prepared as Co oxide support for N 2 The research reports on the catalytic elimination of O decomposition have not optimized the distribution of Co oxides in the direction of the catalyst particle size, so that Co oxides are mainly distributed on the surface of the catalyst macroscopic particles, which is used for N 2 Research reports on the catalytic elimination of O decomposition, not to mention the use of Co(NO 3 ) 2 solution to BaCO 3 The etching effect of the carrier and the Co 2+ Ions and CO 3 2- The combination of the BaCO 3 Adsorption and deposition of CoCO on the surface of carrier particles 3 shell, and finally a highly active porous shell Co oxide / BaCO 3 Catalyst for N 2 Research Report on Catalytic Elimination of O Decomposition

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