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Silver-based catalyst, and preparation method and application thereof

A catalyst, silver-based technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of limiting the popularization and application of precious metal catalysts, large loads, and high catalyst costs, and achieve good oxygen storage capacity. , low cost, good catalytic activity

Pending Publication Date: 2020-05-19
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at this stage, there are few catalysts that can completely catalyze the decomposition of formaldehyde at room temperature or low temperature, and a large amount of expensive noble metals such as platinum, palladium, and gold are required, which leads to high catalyst costs and limits the real application of noble metal catalysts in real life.

Method used

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  • Silver-based catalyst, and preparation method and application thereof
  • Silver-based catalyst, and preparation method and application thereof
  • Silver-based catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Precipitation and deposition: Pour 1.9g of cerium dioxide nanorods into the stirred silver nitrate aqueous solution, mix and stir for 30 minutes to obtain a mixed solution, use sodium hydroxide as a precipitating agent, and dropwise add sodium hydroxide aqueous solution to the mixed solution, Adjust the pH of the mixed solution to 10, and age in a water bath at 60° C. for 3 hours to obtain a precipitate. Wherein, the mass of silver nitrate contained in the silver nitrate aqueous solution is 0.1574g.

[0036] Calcination: filter the mixed solution containing the precipitate by centrifugation and wash away the residual sodium hydroxide, and dry it. The dried precipitate is calcined for 2 hours at 300°C with oxygen and nitrogen mixed gas to obtain the silver-loaded The catalyzer on the cerium oxide nanorod, namely silver-based catalyst, wherein the total mass of silver-based catalyst is 2g, and the loading of silver on the silver-based catalyst is 5wt%, and the loading of ...

Embodiment 2

[0040] This embodiment provides a silver-based catalyst. The difference between this embodiment and Embodiment 1 is that in the step of precipitation and deposition, aging is carried out in a water bath at 50° C., that is, the deposition temperature is 50° C.

Embodiment 3

[0042] This embodiment provides a silver-based catalyst. The difference between this embodiment and Embodiment 1 is that the pH of the mixed solution is adjusted to 9 during the precipitation deposition step. Although silver-based catalysts can also be obtained, under these conditions, the silver in the silver nitrate solution cannot be completely precipitated, resulting in less silver actually loaded onto the ceria nanorods, and the actual loading of silver is lower.

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Abstract

The invention relates to the technical field of catalysts, in particular to a silver-based catalyst, and a preparation method and application thereof. The preparation method of the silver-based catalyst comprises the following steps: precipitation deposition: adding a cerium dioxide nano-material into an aqueous silver nitrate solution to obtain a mixed solution, adding an aqueous hydroxide solution into the mixed solution, controlling a pH value and temperature, and performing aging to obtain a precipitate; and calcination: separating out the precipitate, and calcining the precipitate to obtain the silver-based catalyst. According to the preparation method, loading of the silver catalyst with the cerium dioxide nanometer material is realized by combining precipitation deposition and calcination processes, and experiments prove that the silver-based catalyst has good catalytic performance on low-temperature degradation of formaldehyde. The preparation method is simple in operation process and has universality. The catalyst is good in stability in the preparation process, low in cost, applicable as a filling material for fixed-bed catalysts and good in application prospects.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a silver-based catalyst and its preparation method and application. Background technique [0002] Formaldehyde is a colorless but pungent gas at room temperature. It is widely derived from the release of building materials, home improvement products and other materials. It is a common indoor toxic pollutant. At present, formaldehyde has been identified as a carcinogen by the World Health Organization. Inhaling formaldehyde will cause damage to the human respiratory system and nervous system. If you stay in the formaldehyde environment for a long time, it may also cause leukemia, nasopharyngeal cancer and other diseases. Considering that building materials are the main source of formaldehyde release, and people are accustomed to staying indoors for a long time for various activities, it is of great significance to develop effective indoor formaldehyde removal products and method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J37/03B01J37/08B01D53/86B01D53/72
CPCB01J23/66B01J37/031B01J37/082B01D53/8668B01D2258/06
Inventor 张作泰姜桂敏卜奕玢
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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