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Catalyst for complete catalytic oxidation of indoor low concentration formaldehyde at room temperature

A completely catalytic oxidation and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of complex processes and complex catalyst preparation processes, and achieve The effect of simple use conditions, low precious metal loading, and good industrialization prospects

Inactive Publication Date: 2014-11-26
BEGOOD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101053832A discloses a manganese-cerium composite supported catalyst for purifying formaldehyde in indoor air. The manganese-cerium composite carrier is prepared by precipitation-deposition method, and the active component is loaded and then roasted at high temperature. The whole process is also relatively complicated.
Chinese invention patent CN274281A relates to a catalyst for removing formaldehyde in the air at room temperature and its preparation method. The catalyst is Co-Ce-Sn porous composite oxide supporting precious metal platinum. The preparation process of the catalyst is very complicated

Method used

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  • Catalyst for complete catalytic oxidation of indoor low concentration formaldehyde at room temperature
  • Catalyst for complete catalytic oxidation of indoor low concentration formaldehyde at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0022] Take a certain amount of titanium dioxide powder and impregnate it in a certain concentration of rare earth nitrate aqueous solution, stir and evaporate to dryness, then roast in the air atmosphere, and the carrier modified by rare earth is then impregnated with a certain concentration of chloroplatinic acid solution, stir and evaporate to dryness, after drying , roasted in an air atmosphere, and then reduced in a hydrogen atmosphere to prepare the catalyst of Example 1-1. In the prepared catalyst, the content of the platinum component is 0.1% based on the weight of the metal element. The content of rare earth components is 1% based on the weight conversion of metal elements. The prepared catalyst is 60000 h at GHSV -1 The room temperature catalytic effect on formaldehyde is 93.1%.

Embodiment 1-2

[0024] Take a certain amount of titanium dioxide powder and impregnate it in a certain concentration of rare earth nitrate aqueous solution, stir and evaporate to dryness, then roast in the air atmosphere, and then impregnate the carrier with a certain concentration of chloroplatinic acid solution, stir and evaporate to dryness, and dry it in the air. Roasting in the atmosphere, followed by hydrogen reduction to prepare the catalyst of Example 1-2, in the prepared catalyst, the content of the platinum component is 0.1% in terms of metal element weight conversion. The content of the rare earth component is 3% based on the conversion of the weight of the metal element. The prepared catalyst is 60000 h at GHSV -1 The catalytic effect on formaldehyde at room temperature under the conditions is 100%, and the life curve is shown in the attached figure 1 , continuous reaction for 40 h, the activity remained at 100%, no downward trend was seen.

Embodiment 1-3

[0026] Take a certain amount of titanium dioxide powder and immerse it in a certain concentration of rare earth nitrate aqueous solution, stir and evaporate to dryness, and then roast it in an air atmosphere. The prepared carrier is impregnated with a certain concentration of chloroplatinic acid solution, stirred and evaporated to dryness, dried, and roasted in an air atmosphere, and then hydrogen reduction is used to obtain the catalyst of Example 1-3. In the prepared catalyst, the platinum component is as follows: The weight conversion content of metal elements is 0.1%. The content of rare earth components is 5% based on the weight conversion of metal elements. The prepared catalyst is 60000 h at GHSV -1 The room temperature catalytic effect on formaldehyde is 94.2%.

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Abstract

The invention discloses a catalyst for complete catalytic oxidation of indoor low concentration formaldehyde at room temperature, the catalyst is characterized by comprising a nano metal oxide, a noble metal component and an assistant component, the nano metal oxide is used as a carrier, the noble metal component is at least one from platinum, palladium, ruthenium, rhodium, gold and silver, and the assistant is one or more than one substance from rare earth elements lanthanum, cerium, praseodymium, samarium, yttrium and neodymium, one or more than one kind of. The catalyst has the advantages that: the catalyst uses one or two rare earth modified nano inorganic oxide carrier, and is helpful to improve the dispersity and formaldehyde catalytic oxidation activity of metal nanoparticles. Therefore, under the circumstances of maintaining the same catalytic activity, the amount of noble metals can be reduced, and the cost of the catalyst can be reduced. The catalyst can completely oxidize formaldehyde at room temperature, does not need the help of optical, electric and other complex external auxiliary equipment. The catalyst can catalytically oxidize indoor low concentration harmful gas formaldehyde into non-toxic harmless carbon dioxide and water at room temperature.

Description

technical field [0001] The invention relates to a catalyst, in particular to a rare-earth modified inorganic nanometer oxide-loaded noble metal catalyst used for purifying indoor air pollutant formaldehyde. Background technique [0002] Formaldehyde is one of the most common and prevalent major pollutants in indoor air pollution. It is mainly produced by the release of some building materials and interior decoration materials. Staying indoors containing formaldehyde for a long time will cause great harm to human health even though the concentration of formaldehyde is as low as ppm level. The toxic effects of formaldehyde on the human body mainly have toxic effects on the eyes, respiratory system, lung function, nervous system function and immune system. Long-term exposure to formaldehyde has a carcinogenic effect on the human body. Formaldehyde is also a strong mutagenic and carcinogenic substance, and is one of the risk factors for tumor death. Long-term exposure to low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/66B01J23/89B01D53/86B01D53/72
Inventor 张海平范美仁
Owner BEGOOD TECH
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