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Formaldehyde room-temperature oxidation composite carrier catalyst prepared with sol gel-impregnation method

A composite carrier and sol-gel technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve problems such as poor effects, and achieve high product added value, The effect of simple process route and low precious metal content

Inactive Publication Date: 2018-09-28
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This series of catalysts also has a significant catalytic effect on the catalytic oxidation reaction of low-concentration formaldehyde, but usually the initial conversion temperature of formaldehyde is above 70°C, and the catalytic effect at room temperature is not good.

Method used

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  • Formaldehyde room-temperature oxidation composite carrier catalyst prepared with sol gel-impregnation method
  • Formaldehyde room-temperature oxidation composite carrier catalyst prepared with sol gel-impregnation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. According to the composition of the catalyst, it is 0.1%Pt-0.4%Na-5%TiO 2 - Activated carbon, add 120mL tetrabutyl titanate to 180mL absolute ethanol, stir evenly at room temperature to obtain solution A; mix 50mL distilled water and 250mL absolute ethanol, adjust the pH to 2-3 with concentrated nitric acid, and stir evenly at room temperature to obtain Solution B: Add 300mL of solution B dropwise to 300mL of solution A which is constantly stirring, and continue stirring to obtain a sol system. Wash the purchased columnar activated carbon with water to remove surface impurities and ash, then add 10% nitric acid aqueous solution, boil on the heating furnace for 2 hours, wash with deionized water repeatedly after cooling, put the washed activated carbon in a drying box Dry at 150°C. Then add 529.2g of pretreated columnar activated carbon into the sol system, stir to make it fully mixed, first dry at 60°C in a vacuum oven for 3 hours, and then dry at 120°C in a blast o...

Embodiment 2

[0025] 1. According to the composition of the catalyst, it is 0.2%Pt-0.8%Na-10%TiO 2 -Activated carbon, add 240mL tetrabutyl titanate to 240mL absolute ethanol, stir evenly at room temperature to obtain solution A; mix 50mL distilled water and 150mL absolute ethanol, adjust the pH to 2-3 with concentrated nitric acid, and stir evenly at room temperature to obtain Solution B: Add 200mL of solution B dropwise to 480mL of solution A which is constantly stirring, and continue stirring to obtain a sol system. Wash the purchased columnar activated carbon with water to remove surface impurities and ash, then add 10% nitric acid aqueous solution, boil on the heating furnace for 2 hours, wash with deionized water repeatedly after cooling, put the washed activated carbon in a drying box Dry at 150°C. Then add 498.4g of pretreated columnar activated carbon into the sol system, stir to make it fully mixed, first dry it in a vacuum oven at 60°C for 6 hours, and then dry it in a blast oven...

Embodiment 3

[0028] 1. According to the composition of the catalyst, it is 0.05%Pt-1%TiO 2 - Activated carbon, add 24mL tetrabutyl titanate to 72mL absolute ethanol, stir evenly at room temperature to obtain solution A; mix 75mL distilled water and 400mL absolute ethanol, adjust the pH to 2-3 with concentrated nitric acid, and stir evenly at room temperature to obtain Solution B: Add 475mL of solution B dropwise to 96mL of solution A which is constantly stirring, and continue stirring to obtain a sol system. Wash the purchased columnar activated carbon with water to remove surface impurities and ash, then add 10% nitric acid aqueous solution, boil on the heating furnace for 2 hours, wash with deionized water repeatedly after cooling, and put the washed activated carbon in a drying box Dry at 150°C. Then add 554.1g of pretreated columnar activated carbon into the sol system, stir to make it fully mixed, first dry it in a vacuum oven at 60°C for 3 hours, and then dry it in a blast oven at 1...

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Abstract

The invention discloses a formaldehyde room-temperature oxidation composite carrier catalyst prepared with a sol gel-soaking method. The catalyst is composed of a granular carrier, titanium dioxide with which the granular carrier is dipped and coated and a metal active component, wherein the metal active component is precious metal or a mixture of precious metal and alkali metal. The catalyst is prepared with the continuous method, soaking of titanium sol and soaking of the metal active component are continuously completed, the high-temperature roasting step of a traditional sol-gel method forpreparing titanium dioxide is omitted, the granular carrier is dipped and coated with nanometer titanium dioxide with the sol-gel method to form the composite carrier, and the composite carrier can have the dual effects of loading the metal active component and adsorbing formaldehyde. The content of the precious metal of the catalyst is extremely low, formaldehyde with the high concentration canbe completely catalyzed and oxidized into carbon dioxide and water at the room temperature, and the catalyst has excellent catalytic activity and selectivity and the long service life, and is suitablefor industrial scale production. The catalyst is suitable for the field of air purification, industrial waste gas treating and the like, particularly, is suitable for formaldehyde treatment after indoor decoration.

Description

technical field [0001] The invention belongs to the technical field of formaldehyde catalysis, and in particular relates to a formaldehyde room-temperature oxidation composite carrier catalyst prepared by a sol-gel-impregnation method. Background technique [0002] Formaldehyde is currently recognized as a volatile organic compound that is harmful to human health. It mainly comes from furniture and decoration materials. and adhesives. Formaldehyde has been determined by the World Health Organization as a chemical substance that can cause cancer or deformity, and it is also at the top of the priority list of toxic chemicals in my country. [0003] Physical adsorption technology is currently one of the most widely used air purification technologies. Commonly used adsorbents include activated carbon, molecular sieves, diatomaceous earth, alumina and silica gel. The advantages of physical adsorption method are strong enrichment function and low cost, but physical adsorption wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58B01J23/42B01J29/44B01J23/66B01J37/02B01D53/86B01D53/72
CPCB01D53/8668B01J23/42B01J23/58B01J23/66B01J29/44B01J37/0201
Inventor 李霖曾利辉金晓东陈志坤张之翔曾永康杨乔森
Owner XIAN CATALYST NEW MATERIALS CO LTD
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