Gold catalyst as well as preparation method and application thereof

Abstract

According to the gold catalyst and the preparation method and application thereof, heating, repeated washing and roasting are omitted, a deposition-precipitation method is improved for preparing the supported gold catalyst, the obtained gold catalyst has excellent formaldehyde and carbon monoxide oxidation performance, and the preparation method is simple, high in repeatability and suitable for industrial production. Reaction conditions are mild, heating reaction, high-temperature roasting and repeated washing are not needed, the preparation cost is low, the raw material utilization rate is high, and waste gas and waste water are reduced.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a gold catalyst and its preparation method and application. Background technique [0002] Both formaldehyde and carbon monoxide are the main indoor air pollutants, which have serious harm to the human body. The main hazard of formaldehyde is the irritation to the skin and mucous membranes. When formaldehyde reaches a certain concentration indoors, people will feel uncomfortable, which is greater than 0.08mg / m 3 High formaldehyde concentrations can cause red eyes, itchy eyes, throat discomfort or pain, hoarseness, sneezing, chest tightness, wheezing, dermatitis, etc. Carbon monoxide is a highly toxic pollutant to the blood and nervous system. Carbon monoxide in the air enters the human blood through the respiratory system and combines with hemoglobin in the blood to form a reversible conjugate. The combination of carbon monoxide and hemoglobin not only r...

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Problems solved by technology

[0008] However, the disadvantage of the deposition-precipitation method is that the conditions are not easy to control, and the reproducibility is often poor. A considerable part of the gold nucleates and grows in the solution instead of depositing on the surface of the carrier. The deposition-precipitation method generally requires roasting the sample under a certain atmosphere and temperature. , or after reduction treatment, the catalyst can be activated. The treatment process is relatively complicated, and the deposition and precipitation method has the problems of waste of raw materials, waste water and waste gas generated by high-temperature roasting and other secondary pollution problems.

[0009] The currently commonly used catalyst that can efficiently remove formaldehyde and CO at room temperature is a platinum catalyst. For example, CN112371121A discloses a catalyst for eliminating formaldehyde and carbon monoxide at room temperature and a preparation method thereof. The catalyst uses platinum-based noble metals as active components. The manganese-potassium-type octahedral molecular sieve is used as a carrier to load the platinum-based noble metal active components on the manganese-potassium-type octahedral molecular sieve carrier; however, the cost of the catalyst is high, and the preparation method requires high-temperature roasting and reduction pretreatment, and the process is cumbersome And there is secondary pollution such as exhaust gas

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