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Monolithic catalyst for catalyzing combustion of volatile organic compounds and preparation method of catalyst

A monolithic catalyst and volatile organic compound technology, applied in physical/chemical process catalysts, combustion methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of cumbersome preparation process, small loading capacity, and reduced catalyst activity and other problems, to achieve the effect of simplifying the preparation process, improving the preparation efficiency and reducing the cost

Inactive Publication Date: 2016-09-28
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation process is more loaded down with trivial details, and catalyst coating firmness is relatively poor, and active component is mainly distributed in catalyst pore outer surface, can cause catalyst activity to reduce after coating wears off (Chinese patent CN102049312B, CN102240560B, CN102000570A, CN1212889C, CN101474566B, CN102366723A )
Chinese patent CN104549253A adopts the sol method to prepare the coating for loading. The single loading capacity of the sol method is small, and the specific surface area of ​​the prepared carrier is small, so the number of coatings increases and the catalyst activity is relatively low.

Method used

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  • Monolithic catalyst for catalyzing combustion of volatile organic compounds and preparation method of catalyst

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Experimental program
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Effect test

Embodiment 1

[0045] Catalyst performance evaluation is carried out using a laboratory small-scale reaction device. The schematic diagram of the experimental evaluation device is shown in figure 1 shown. The loading capacity of the catalyst is 18ml, and asbestos is fixed around the catalyst to prevent gas from passing through it. First, the catalyst was reduced with a hydrogen / nitrogen mixed gas, the volume of hydrogen accounted for 5% of the total mixed gas volume, the flow rate of the mixed gas was 200ml / min, the reduction temperature was 80°C, and the reduction time was 24 hours. Catalytic combustion tests were carried out using toluene as a representative of VOCs. The reaction gas is a mixture of toluene and air, the concentration of toluene in the toluene / air mixture is 1000ppm, and the space velocity of the reaction gas is 20000h -1 . The system pressure is normal pressure. During the evaluation of the catalyst, the activity of the catalyst to catalyze the combustion of volatile o...

Embodiment 2

[0054] Preparation of catalyst precursor

[0055] Weigh 2g of pseudo-boehmite, and measure 2ml of concentrated nitric acid, and add to 40ml of deionized water. Then 25g γ-Al 2 o 3 Add it to the above mixed slurry, put it into a 500ml ball mill tank, adjust the speed of the ball mill to 400r / min, and ball mill it for 0.5 hours to obtain the catalyst coating slurry. A cordierite honeycomb ceramic carrier with a cell mesh number of 200 holes / square inch was selected, and a conventional impregnation method was used for 2 minutes, and then compressed air was used to remove excess liquid slurry inside the channel of the cordierite honeycomb ceramic carrier. Then the catalyst was slowly dried at a temperature of 50°C, and weighed after drying. Repeat the above steps until the mass of the catalyst precursor accounts for 9% of the mass of the catalyst carrier and stop uploading. Then the catalyst was slowly dried at a temperature lower than 50°C, and after drying for 12 hours, it w...

Embodiment 3

[0060] Preparation of catalyst precursor

[0061] Weigh 10ml of H 2 Pd(NO 3 ) 4 The solution (Pd elemental content is 6mg / ml) was dissolved in 35ml of deionized water, and then 25g of γ-Al 2 o 3 Pour into the mixed solution for dipping, and mix well. Other preparation method steps are with embodiment 1. The number of the catalyst is Exa.3, and the experimental results of the evaluation are shown in Table 1.

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Abstract

The invention belongs to the technical field of catalysis, and particularly discloses a monolithic catalyst for catalyzing combustion of volatile organic compounds and a preparation method of the catalyst. According to the catalyst, cordierite honeycomb ceramic serves as a carrier, and the carrier is coated with a coating containing a metal active component and an auxiliary, wherein the catalyst active component is selected from any one or a combination of noble metals of Pt and Pd, and the catalyst auxiliary is selected from one or a combination of metal oxides such as aluminum oxide, titanium oxide, chromic oxide, cobaltous oxide and manganese oxide. The preparation method of the catalyst is simple, and the catalyst has the advantages that the coating is not prone to disengagement, the initiation temperature is low, the activity is good, the high-temperature-resistant property is good, and the noble metal content is low; the catalyst can be widely used for purification treatment of organic waste gas.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to an integral catalyst for catalytic combustion of volatile organic compounds and a preparation method thereof. Background technique [0002] According to the definition of the World Health Organization (WHO), volatile organic compounds (VOCs) refer to organic compounds with a saturated vapor pressure greater than 133.32Pa at room temperature and a boiling point between 50°C and 260°C, mainly including alkanes, aromatic hydrocarbons, aromatic hydrocarbons, and alkenes , alcohols, aldehydes, ketones, halogenated hydrocarbons, etc. VOCs pose a serious threat to human health and life. Among the many technologies for treating VOCs waste gas (including adsorption technology, absorption technology, condensation technology, membrane separation technology, thermal incineration, catalytic combustion, etc.), catalytic combustion has a wide range of applications, no secondary po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/652B01J23/656B01J23/89B01J23/44F23G7/07
CPCB01J23/6562B01J23/44B01J23/63B01J23/6522B01J23/8913B01J23/8926F23G7/07
Inventor 苏敏王磊宋元江向建安张明胜李敬张新波
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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