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Room temperature formaldehyde purification catalyst and preparation method thereof

A formaldehyde purification and catalyst technology, used in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor moisture resistance and stability of catalysts, avoid water instability, The effect of avoiding the reaction

Inactive Publication Date: 2020-09-22
闫英辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The moisture resistance and stability of the catalyst in the above invention are relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Preparation of mesoporous cerium-zirconium composite oxide

[0030] Weigh 0.01 mol of cerium nitrate and 0.01 mol of zirconium nitrate, dissolve them in 200 mL of deionized water and stir at room temperature for 15 min, then add a certain amount of template agent CTAB and 0.4 mol of urea, and stir the resulting mixed solution for 30 min Afterwards, treat at 90°C for 24 hours, centrifuge, wash, and dry the obtained product, and then roast at 500°C for 5 hours to obtain a cerium-zirconium composite oxide with a mesoporous structure. Wherein the addition of CTAB is 15% of the mass sum of cerium nitrate and zirconium nitrate.

[0031] 2) Synthesis of ionic liquid precursor NMMPS

[0032]Weigh 0.10 mol of 1,3-propane sultone into the ultrasonic reactor, then add 100 mL of p-xylene to the reactor to dissolve it completely, and then feed high-purity nitrogen into the reactor at a rate of 50 mL / min. Ventilate at a rate of 1 h; then open the ultrasonic reactor and keep the ...

Embodiment 2

[0039] 1) Preparation of mesoporous cerium-zirconium composite oxide

[0040] Weigh 0.02 mol of cerium nitrate and 0.02 mol of zirconium nitrate and dissolve them in 400 mL of deionized water and stir at room temperature for 15 min, then add a certain amount of template agent CTAB and 0.8 mol of urea, and stir the resulting mixed solution for 30 min Afterwards, treat at 90°C for 24 hours, centrifuge, wash, and dry the obtained product, and then roast at 500°C for 5 hours to obtain a cerium-zirconium composite oxide with a mesoporous structure. Wherein the addition of CTAB is 10% of the mass sum of cerium nitrate and zirconium nitrate.

[0041] 3) Synthesis of ionic liquid precursor NMMPS

[0042] Weigh 0.10 mol of 1,3-propane sultone into the ultrasonic reactor, then add 100 mL of p-xylene to the reactor to dissolve it completely, and then feed high-purity nitrogen into the reactor at a rate of 20 mL / min. Ventilate at a rate of 2 h; then open the ultrasonic reactor and keep ...

Embodiment 3

[0049] 1) Preparation of mesoporous cerium-zirconium composite oxide

[0050] Weigh 0.01 mol of cerium nitrate and 0.01 mol of zirconium nitrate, dissolve them in 200 mL of deionized water and stir at room temperature for 15 min, then add a certain amount of template agent CTAB and 0.4 mol of urea, and stir the resulting mixed solution for 30 min Afterwards, treat at 90°C for 24 hours, centrifuge, wash, and dry the obtained product, and then roast at 500°C for 5 hours to obtain a cerium-zirconium composite oxide with a mesoporous structure. Wherein the addition of CTAB is 12% of the mass sum of cerium nitrate and zirconium nitrate.

[0051] 2) Synthesis of ionic liquid precursor NMMPS

[0052] Weigh 0.10 mol of 1,3-propane sultone into the ultrasonic reactor, then add 100 mL of p-xylene to the reactor to dissolve it completely, and then inject high-purity nitrogen into the reactor at a rate of 40 mL / min. Ventilate at a rate of 2 h; then open the ultrasonic reactor and keep t...

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Abstract

The invention discloses a room temperature formaldehyde purification catalyst. Cerium-zirconium composite oxide with a mesoporous structure and titanium-based solid ionic liquid are combined to serveas a composite carrier, PdPt alloy loaded through a photochemical deposition method serves as an active component, the mass fraction of Pt in the catalyst is 0.02 wt%-0.5 wt%, and the mass fraction ofPd in the catalyst is 1 wt%-5 wt%. The catalyst is prepared by the following steps: (1) preparing a mesoporous cerium-zirconium composite oxide; (2) synthesizing an ionic liquid precursor NMMPS; (3)synthesizing the mesoporous cerium-zirconium composite oxide and a titanium-based solid ionic liquid composite carrier; and (4) loading an active component PdPt. According to the preparation method, metal cations and organic cations are doped, noble metal PdPt is loaded by adopting an ultraviolet chemical deposition method, and the prepared catalyst has excellent moisture resistance and stabilityon the premise of keeping relatively high catalytic efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a formaldehyde purification technology, in particular to a room-temperature formaldehyde purification catalyst and a preparation method thereof. Background technique [0002] Formaldehyde is one of the main indoor air pollutants that people are most familiar with. It is not only a product of interior decoration, but also has penetrated into our daily life everywhere, such as range hood exhaust, second-hand smoke, automotive materials, paint coatings , aquatic products, etc. will release formaldehyde. Free formaldehyde molecules are flooding our living environment, endangering people's health. According to relevant reports, living in an environment containing formaldehyde for a long time can cause symptoms such as throat discomfort and sore eyes, and it is easy to induce leukemia and other cancers, and even death in severe cases. Relevant departments have tested t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J27/19B01J35/00B01J35/10B01J37/34B01D53/86B01D53/72
CPCB01J31/0282B01J31/0285B01J31/0294B01J31/0298B01J27/19B01J37/345B01D53/8668B01J35/391B01J35/61B01J35/64
Inventor 闫英辉
Owner 闫英辉
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