Preparation method and application of surface defect-rich catalyst for NH3 catalytic oxidation

Through heteropolyacid modified molecular sieve and high-temperature reduction treatment, a surface-rich NH3 catalytic oxidation catalyst was constructed, which solved the problems of low N2 selectivity and insufficient low-temperature activity of existing catalysts under a wide temperature window, and achieved efficient NH3 catalytic oxidation and N2 selectivity improvement.

CN119657224APending Publication Date: 2025-03-21CHINA ENERGY INVESTMENT CORP LTD +1
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Patent Information

Application Number
CN202311223359.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-21
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

The existing NH3 catalytic oxidation catalysts have low N2 selectivity under a wide temperature window and insufficient low-temperature catalytic activity, making it difficult to efficiently remove indoor air pollutants such as NH3.

Method used

The molecular sieve was modified by heteropolyacid, and the supported catalyst was reduced at high temperature in a mixed CO reduction atmosphere to construct defect-rich sites on the surface to improve the NH3 catalytic oxidation activity and N2 selectivity of the catalyst.

Benefits of technology

It is achieved to improve the NH3 conversion rate and N2 selectivity under a wide temperature window, improve the low-temperature activity of the catalyst, and overcome the problems of low low-temperature activity and poor selectivity of the existing catalysts at high-temperature N2.

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Abstract

The invention belongs to the technical field of NH3 catalytic oxidation catalysts, and particularly relates to a preparation method and application of a surface defect-rich catalyst for NH3 catalytic oxidation, and the preparation method comprises the following steps: (1) mixing heteropolyacid, a molecular sieve and deionized water, grinding, carrying out vacuum drying, and calcining in an inert atmosphere to obtain catalyst carrier powder; (2) weighing a manganese precursor salt and an auxiliary agent precursor salt, dissolving the manganese precursor salt and the auxiliary agent precursor salt in water to prepare an aqueous solution, adding the catalyst carrier into the aqueous solution of the manganese precursor salt and the auxiliary agent precursor salt, carrying out vacuum drying, and calcining in an inert atmosphere to obtain a supported catalyst; and (3) reducing the supported catalyst in a mixed reducing atmosphere containing CO / inert gas to obtain the catalyst with rich surface defects. According to the method disclosed by the invention, rich defect sites can be constructed on the surface of the catalyst, the NH3 catalytic oxidation activity of the catalyst under a wide temperature window is promoted, and meanwhile, the N2 selectivity is improved.
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