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Method for preparing integral metal-based environmental catalyst by metal replacement method

A metal replacement and metal-based technology, which is applied in the field of preparation of organic waste gas overall metal-based oxidation catalysts, can solve the problems of cumbersome preparation methods, poor adhesion of active components, affecting catalytic activity and stability, and achieve high catalytic oxidation of VOCs Effect

Pending Publication Date: 2022-03-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Or directly coat a layer of supported noble metal catalyst on the metal surface, and then after high-temperature activation treatment, the overall catalyst is obtained. The preparation method is relatively cumbersome, and the prepared catalyst also has the problems of low dispersion and poor adhesion of active components. Affects catalytic activity and stability

Method used

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  • Method for preparing integral metal-based environmental catalyst by metal replacement method
  • Method for preparing integral metal-based environmental catalyst by metal replacement method
  • Method for preparing integral metal-based environmental catalyst by metal replacement method

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preparation example Construction

[0031] The preparation method of noble metal monolith catalyst of the present invention comprises the steps:

[0032] (1) Preparation of chloroplatinic acid and chloropalladium acid solution: take by weighing H 2 PtCl 6 ·6H 2 O or H 2 PdCl 4 Dissolve it in 250ml of water, configure it into a mother liquor of 2.5-12.5g / L (based on the quality of precious metal platinum or palladium), and prepare different concentrations of chloroplatinic acid or chloropalladium acid solutions with the mother liquor of 2.5-12.5g / L, called Take 50-200 mg of F127 and dissolve it therein as a noble metal precursor solution.

[0033] (2) Pretreatment of the metal carrier substrate: first place the metal material in acetone and ultrasonically vibrate for 30 minutes to remove surface oil stains. %-30%HNO 3 Ultrasonic vibration in the solution for 30 minutes to remove the oxide layer on the surface of the metal mesh, after the end, take it out and rinse it with deionized water, and treat it at 20...

Embodiment 1

[0037] A monolithic catalyst with a loading of 0.1% Pt / 304 stainless steel was prepared. Take 0.4ml of 2.5g / L (based on the mass of platinum) mother liquor and mix it with 9.6ml of water, then add 50mg of F127 to make a 10ml solution in a test tube, put 1g of pretreated 304 stainless steel metal mesh into the test tube In 90 ℃ water bath, immersion replacement, every 10min with a UV spectrophotometer to measure the concentration of the solution until the Pt ion concentration becomes 0, then filter, 300 ℃ roasting 3h, the obtained catalyst is marked as: 0.1%Pt / 304-W.

Embodiment 2

[0039] A monolithic catalyst with a loading of 0.2% Pt / 304 stainless steel was prepared. The conditions are the same as in Example 1. Mix 0.8ml of 2.5g / L (based on the mass of platinum) mother liquor and 9.2ml of water, then add 50mg of F127 to form a 10ml solution in a test tube, and put 1g of pretreated 304 Put the stainless steel metal mesh into the test tube, immerse and replace it in a water bath at 90°C, measure the concentration change of the solution with a UV spectrophotometer every 10 minutes, until the Pt ion concentration becomes 0, then filter, roast at 300°C for 3 hours, and the obtained catalyst is labeled For: 0.2% Pt / 304-W.

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Abstract

The invention discloses a method for preparing a monolithic metal-based environmental catalyst by a metal replacement method, which comprises the following steps: carrying out acid pickling, alkali washing and water washing on a monolithic metal substrate, and then carrying out heat treatment in an air atmosphere for later use; dissolving a noble metal precursor in water, and then adding a surfactant to obtain a noble metal precursor replacement liquid; at 40-95 DEG C, immersing the integral metal base material into a precious metal precursor replacement liquid, carrying out metal replacement reaction, taking out the integral metal base material after metal replacement is completed, cleaning, drying, and roasting at 200-500 DEG C for 3-5 hours to obtain the integral metal-based catalyst, according to the invention, an integral metal-based catalyst slurry coating technology is abandoned, metal and alloy materials in any shape can be rapidly and firmly loaded with nano noble metal active components on the surface through a metal replacement reaction, the noble metal active components are tightly combined with a metal base material, the shedding rate is almost zero, and the catalyst has a good application prospect. And the catalyst shows very high characteristic of catalytic oxidation of VOCs (Volatile Organic Compounds).

Description

technical field [0001] The invention relates to the technical field of environmental catalyst preparation, in particular to a method for preparing an organic waste gas (VOCs) integral metal-based oxidation catalyst. The catalyst prepared by the invention can be applied to catalytic combustion to eliminate industrial volatile organic waste gas pollution. Background technique [0002] At present, a variety of technologies have been developed for the treatment of VOCs in the industry, which mainly include two categories: one is the recovery method including adsorption, absorption, membrane separation and condensation technologies; the other is the recovery method including catalytic combustion, thermodynamics, etc. Destruction methods such as incineration, biodegradation, photocatalytic decomposition and plasma oxidation. Catalytic combustion technology can completely degrade VOCs into harmless CO by deep oxidation under milder conditions (generally 200-500°C) due to the princi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/42F23G7/07
CPCB01J23/8993B01J23/42F23G7/07F23G2209/14
Inventor 卢晗锋周文茜李剑宇周瑛耿俊
Owner ZHEJIANG UNIV OF TECH
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