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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AI-Extracted 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 wil...

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.

Application Domain

Molecular sieve catalystsDispersed particle separation

Technology Topic

Molecular sievePrecious metal +8

Examples

Experimental program(3)

Example Embodiment

[0022] Example 1: Add 0.08g of sodium metaaluminate (NaAlO 2 ) Dissolve in 40ml deionized water, stir until completely dissolved, add 25ml TPAOH template, continue stirring for 15 minutes, add 20ml TEOS, continue stirring for 360 minutes, slowly add 3.34ml chloroplatinic acid (1g/100ml) to the above mixed solution After stirring the solution for 60 minutes, it was reacted and crystallized in a closed reactor at 180°C for 4 days, then the solid was separated by centrifugation, washed with deionized water several times, and roasted at 550°C for 5 hours to remove the template. Reduce at 300°C for 120 minutes to obtain a catalyst.

Example Embodiment

[0023] Example 2: 0.01g sodium metaaluminate (NaAlO 2 ) Dissolve in 40ml deionized water, stir until it is completely dissolved, add 25ml TPAOH template, continue stirring for 60 minutes, add 27ml TEOS, continue stirring for 420 minutes, slowly add 10ml chloroplatinic acid (1g/100ml) solution to the above mixed solution After stirring for 120 minutes, react and crystallize in a closed reactor at 160°C for 6 days, then separate the solids by centrifugation, wash several times with deionized water, and roast at 650°C for 5 hours to remove the template, and then under a hydrogen atmosphere Reduce at 400°C for 2h to obtain a catalyst.

Example Embodiment

[0024] Example 3: Add 0.73g of sodium metaaluminate (NaAlO 2 ) Dissolve in 40ml deionized water, stir until it is completely dissolved, add 9ml TPAOH template, continue stirring for 10 minutes, add 20ml TEOS, continue stirring for 120 minutes, slowly add 0.33ml chloroplatinic acid (1g/100ml) to the above mixed solution After stirring the solution for 10 minutes, it was reacted and crystallized in a closed reactor at 200°C for 2 days, and then the solid was separated by centrifugation, washed with deionized water several times, and baked at 350°C for 2 hours to remove the template. Reduce at 200°C for 30 min to obtain a catalyst.

[0025] The catalysts prepared in the above 4 examples were ground and sieved to 40-60 mesh, and 0.1g of the above catalysts were respectively loaded into the tubular fixed bed reactor. The experimental conditions were controlled as follows: the fixed bed temperature was 25±1℃, and the carrier gas was Compressed air, humidity RH=50±5%, mass space velocity is 600,000ml/(g·h), formaldehyde inlet concentration is 10mg/m3, catalyst activity is characterized by formaldehyde removal rate, the results are shown in the table below.

[0026] Example Formaldehyde removal rate Mixing times Heat treatment times time consuming Comparative example 0.68 2 3 6 days Example 1 0.77 1 2 5 days Example 2 0.56 1 2 7 days Example 3 0.25 1 2 3 days

[0027] It can be seen from the above results that the removal effect of Example 1 and Example 2 is relatively close to that of the comparative example (the effect of Example 1 is better), but the process is simpler and consumes less energy, which is good for popularization and application.

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Description & Claims & Application Information

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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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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