Silver-manganese oxide composite catalyst and preparation method and application thereof

A composite catalyst, manganese oxide technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of difficult controllable synthesis, high cost and preparation of catalyst The method is complex and other problems, to achieve the effects of strong controllability of the preparation process, simple preparation method and controllable reaction process

Active Publication Date: 2019-01-18
中融创源科技发展有限公司
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Problems solved by technology

CN 102513106A discloses a high-efficiency ozone decomposition catalyst at room temperature, which uses manganese nitrate, cerium nitrate, and silver nitrate as precursors, supplemented with precipitants, oxidants, and templates for hydrothermal reaction, and then roasts. Although the catalyst can be Efficiently decomposes ozone at room temperature, but the preparation method is complicated, the cost is high, and the catalyst is difficult to controllably synthesize

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  • Silver-manganese oxide composite catalyst and preparation method and application thereof

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preparation example Construction

[0044] The specific embodiment part of the present invention provides a kind of preparation method of silver manganese oxide composite catalyst, described method comprises the following steps:

[0045] (1) Add alkaline solution to manganese source and silver source mixed solution, react to generate solid precipitation;

[0046] (2) Calcining the solid precipitate obtained in step (1) to obtain a silver-manganese oxide composite catalyst.

Embodiment 1

[0049] The present embodiment provides a kind of preparation method of silver manganese oxide composite catalyst, described method comprises the following steps:

[0050] (1) be that manganese nitrate and silver nitrate that mol ratio is 14:1 are dissolved in water, form mixed solution, drip excess sodium carbonate solution under stirring condition, reaction generates manganese carbonate and silver carbonate mixed solid precipitation;

[0051] (2) Wash the mixed solid precipitate obtained in step (1) until neutral, dry at 120° C., and then calcinate at 600° C. for 3 hours to obtain a silver-manganese oxide composite catalyst.

[0052] The silver-manganese oxide composite catalyst that is prepared is carried out X-ray diffraction (XRD) analysis, the result is as follows figure 1 Shown; The catalyst is carried out ozonolysis performance test, and concrete test condition is: ozone concentration is 40ppm, and test temperature is 30 ℃, and relative humidity is 70%, and reaction spa...

Embodiment 2

[0055] The present embodiment provides a kind of preparation method of silver manganese oxide composite catalyst, described method comprises the following steps:

[0056] (1) Manganese sulfate and silver nitrate with a mol ratio of 14:1 are dissolved in water to form a mixed solution, and excessive potassium carbonate solution is added dropwise under stirring conditions, and the reaction generates a mixed solid precipitation;

[0057] (2) Washing the mixed solid precipitate obtained in step (1) until neutral, drying at 90° C., and calcining at 300° C. for 5 hours to obtain a silver-manganese oxide composite catalyst.

[0058] The prepared silver-manganese oxide composite catalyst was subjected to an ozonolysis performance test, and the specific test conditions were referred to in Example 1.

[0059] In this example, the mass fraction of silver in the obtained catalyst was 8 wt%. After the ozone decomposition performance test, under the above test conditions of high space veloc...

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Abstract

The invention provides a silver-manganese oxide composite catalyst and a preparation method and application thereof. The preparation method comprises the following steps that an alkaline solution is added into a mixed solution of a manganese source and a silver source to react to generate solid precipitate; and the obtained solid precipitate is roasted to obtain the silver-manganese oxide composite catalyst. The silver-manganese oxide composite catalyst is prepared through a co-precipitation-roasting method, the catalyst forms a manganese-barium ore crystal structure, the electron transfer rate is high, the catalytic ozone decomposition activity is high, and when the relative humidity is about 70%, the ozone conversion rate can reach 80% or above in 6 h. The catalyst preparation method issimple and fast, the preparation process is high in controllability, adopted raw materials and the operating process are low in cost, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a silver-manganese oxide composite catalyst, its preparation method and application, in particular to a silver-manganese oxide composite catalyst, its preparation method and its application in the field of ozone decomposition. Background technique [0002] Ozone (O 3 ) is an allotrope of oxygen, which is unstable at room temperature and has a double-edged sword effect on the environment on which human beings live. In the stratosphere, ozone is beneficial to the living environment of human beings, and it can resist harmful The ultraviolet rays of the earth directly shine on the earth, but near the surface, the ozone is more harmful, and it will have different degrees of impact on the human skin, immune system and nervous system. Part of the ozone that people are exposed to comes from the ozone generated by photochemical reactions of nitrogen oxides and volatile organic compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J37/03B01J37/08B01D53/86B01D53/66
CPCB01D53/8675B01J23/002B01J23/688B01J37/03B01J37/082Y02A50/20
Inventor 贺泓马金珠李晓彤张长斌
Owner 中融创源科技发展有限公司
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