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Preparation method of molecular sieve catalyst for formaldehyde removal

A catalyst and molecular sieve technology, applied in the field of formaldehyde catalyst preparation, can solve the problems of expensive equipment, high technical requirements, secondary pollution, etc., and achieve high removal effect and simple overall process

Inactive Publication Date: 2020-04-07
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, commonly used indoor air purifiers mainly use the strong adsorption of adsorbent materials to adsorb pollutants such as formaldehyde. Porous clay ore, activated alumina and silica gel, etc. This method is relatively simple to operate, but the adsorbent needs to be replaced regularly, which is prone to secondary pollution
Plasma catalytic technology can decompose indoor harmful gases at normal temperature and pressure, but by-products such as carbon monoxide, ozone and nitrogen oxides will be produced, and the plasma generation equipment is expensive
The technology of photocatalytic decomposition of pollutants is currently the indoor air purification technology that has been studied more, and has achieved good indoor air purification effects, but this type of catalyst is mainly based on TiO 2 Nano powder or thin film is used as photocatalyst, the raw material preparation method is complicated, the technical requirements are high, and nano photocatalyst needs specific excitation light source

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: 0.08g sodium metaaluminate (NaAlO 2 ) was dissolved in 40ml of deionized water, stirred until completely dissolved, then added 25ml of TPAOH template, continued to stir for 15min, then added 20ml of TEOS, continued to stir for 360min, slowly added 3.34ml of chloroplatinic acid (1g / 100ml) to the above mixed solution Solution, continue to stir for 60 minutes, react and crystallize in a closed reactor at 180°C for 4 days, then separate the solid matter by centrifugation, wash with deionized water several times, and roast at 550°C for 5 hours to remove the template agent, and then in a hydrogen atmosphere Reduction at 300°C for 120 minutes to obtain a catalyst.

Embodiment 2

[0023] Embodiment 2: 0.01g sodium metaaluminate (NaAlO 2 ) was dissolved in 40ml of deionized water, stirred until completely dissolved, then added 25ml of TPAOH template, continued to stir for 60min, then added 27ml of TEOS, continued to stir for 420min, slowly added 10ml of chloroplatinic acid (1g / 100ml) solution to the above mixed solution , continue stirring for 120min, react and crystallize in a closed reactor at 160°C for 6 days, then separate the solid matter by centrifugation, wash with deionized water several times, and roast at 650°C for 5h to remove the template agent, and then in a hydrogen atmosphere Reduction at 400°C for 2h to obtain the catalyst.

Embodiment 3

[0024] Embodiment 3: 0.73g sodium metaaluminate (NaAlO 2 ) in 40ml of deionized water, stirred until completely dissolved, then added 9ml of TPAOH template, continued to stir for 10min, then added 20ml of TEOS, continued to stir for 120min, slowly added 0.33ml of chloroplatinic acid (1g / 100ml) to the above mixed solution Solution, continue to stir for 10 minutes, react and crystallize in a closed reactor at 200°C for 2 days, then separate the solid matter by centrifugation, wash with deionized water several times, and roast at 350°C for 2 hours to remove the template agent, and then in a hydrogen atmosphere Reduction at 200°C for 30 minutes to obtain a catalyst.

[0025] Grind and sieve the catalysts prepared in the above four examples to 40-60 mesh, respectively take 0.1 g of the above catalysts and put them into a tubular fixed-bed reactor. Compressed air, humidity RH=50±5%, mass space velocity 600,000ml / (g h), formaldehyde inlet concentration 10mg / m3, catalyst activity is ...

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Abstract

The invention discloses a preparation method of a molecular sieve catalyst for formaldehyde removal. The method is characterized by comprising the following steps of: dissolving sodium metaaluminate in deionized water, and carrying out primary stirring until the sodium metaaluminate is completely dissolved; adding a TPAOH template agent and performing secondary stirring; adding TEOS and performingtertiary stirring; slowly adding a precious metal salt solution into a mixed solution obtained in the previous step; after quaternary stirring, conducting reaction crystallization in a closed reaction kettle under a heating condition, and separating solids; cleaning the solids with deionized water, and carrying out roasting to remove the template agent; and then carrying out heat treatment in a hydrogen atmosphere so as to obtain the catalyst. According to the invention, precious metal is doped on the molecular sieve, and the normal-temperature catalytic material for formaldehyde removal andwith the highly dispersed precious metal and excellent activity is formed in one step; and the whole process of the method is simpler, and enlarged application is facilitated.

Description

[0001] Preparation method of formaldehyde molecular sieve catalyst technical field [0002] The invention relates to the preparation of a formaldehyde catalyst, which can decompose formaldehyde. Background technique [0003] With the improvement of people's material and cultural living standards, interior decoration has become fashionable, but indoor air pollution is also becoming more and more serious. Formaldehyde is one of the most typical and serious pollutants in the indoor environment. The concentration limit of formaldehyde pollutants in indoor air stipulated by my country's national standards is 0.08mg / m3. At present, the concentration of formaldehyde in the indoor environment of our country exceeds the standard. According to the sampling survey conducted by the National Center for Disease Control and Prevention, more than 60% of the newly decorated residential buildings in my country have excessive formaldehyde concentration, which has caused great harm to people's...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01D53/86B01D53/72
CPCB01D53/8668B01J29/44
Inventor 郭国良霍彦强戴九松
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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