Cryptomelane-based composite metal element catalyst, and preparation method and application thereof

Abstract

The invention provides a cryptomelane-based composite metal element catalyst, and a preparation method and application thereof. The cryptomelane-based composite metal element catalyst is prepared from acryptomelane-containing manganese oxide molecular sieve and a doping metal element, wherein the doping metal element enters a cryptomelane type manganese oxidemolecular sieve framework; the mole ratio of the manganese element in the cryptomelane type manganese oxidemolecular sieve to the doping metal element is (100 to 1) to (10 to 1); the cryptomelane type manganese oxide molecular sieve is obtained through the reaction of septivalence manganese and bivalent manganese; the mole ratio of the septivalence manganese to the bivalent manganese is (2 to 1) to (0.5 to 1). The cryptomelane-based composite metal element catalyst provided by the invention has high catalytic activity, and the usage of precious metal is not needed or reduced, so that the cost of the catalyst is greatly reduced; the catalyst has no need to be activated by utilizing hydrogen reduction, is simple in usage conditions, and can be widely applied in purification treatment of benzene-containing waste gas discharged by fixed sources such as a smelting plant, an oil refinery plant and a chemical plant.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a cryptopotassium-based composite metal element catalyst, a preparation method and application thereof. Background technique [0002] As the intensity of human industrial activities increases, a large amount of volatile organic compounds (Volatile Organic Compounds, VOCs for short) are discharged into the atmosphere, causing environmental pollution through a series of chemical reactions. For example, some active VOCs can interact with another atmospheric pollutant nitrogen oxides (NO x ) photochemical reaction, causing the surface ozone concentration to rise, forming photochemical smog pollution; some VOCs with low vapor pressure can also nucleate and grow through complex processes to form secondary organic aerosols, and secondary organic aerosols are fine particulate matter PM2. 5 important components. It can be seen that VOCs are important precursors for the formation of phot...

AI Technical Summary

Problems solved by technology

Catalytic combustion of benzene is a relatively efficient control technology at present, but at present, the traditional powder catalyst has the disadvantage of using a large amount of precious metals such as palladium and platinum, which makes the preparation cost of the catalyst high and the catalytic activity needs to be improved

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