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Supported composite transition metal oxide, preparation method and application thereof as catalyst

A transition metal and transition metal salt technology, applied in the field of supported composite transition metal oxides and preparation, can solve problems such as the aggregation of catalyst active components, achieve high catalytic activity and stability, have both stability, and promote catalytic combustion Effect

Active Publication Date: 2019-05-21
武汉时泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the problem of aggregation of catalyst active components caused by high temperature calcination in the prior art

Method used

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  • Supported composite transition metal oxide, preparation method and application thereof as catalyst
  • Supported composite transition metal oxide, preparation method and application thereof as catalyst
  • Supported composite transition metal oxide, preparation method and application thereof as catalyst

Examples

Experimental program
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Effect test

preparation example Construction

[0035] (1) Preparation of zeolite molecular sieve carrier: first weigh 0-6.4g of F127 in a beaker, then add 32g of deionized water and keep stirring until F127 is completely dissolved. At the same time, take another beaker and weigh 0-0.51g of aluminum isopropoxide and 5.2-31.2g of tetraethyl orthosilicate (TEOS) and stir evenly. After F127 is completely dissolved, add the mixed solution dropwise into the F127 aqueous solution. After several hours of vigorous stirring, 2.0-8.2 g of tetrapropylammonium hydroxide solution (TPAOH) was added, and the stirring was continued until it became a gel. The whole stirring process is carried out at 20-100°C. The obtained wet gel is aged at 20-100° C. for 4-10 hours, and then dried at 60-120° C. until the weight of the dry gel remains unchanged. The xerogel obtained through the above steps is treated with a steam-assisted method at 140-200° C. for 12-24 hours. After the product is washed and filtered, it is dried at 60-120°C. Finally, th...

Embodiment 1

[0038] Take 1g of multi-level porous ZSM-5 powder in a mortar, weigh 0.54g of cobalt nitrate hexahydrate and 0.295g of potassium permanganate into the mortar, grind to a uniform state, transfer to a 10mL crucible after low-temperature vacuum drying, and Place in a high-pressure reaction kettle, add 1.6g of ammonia water into the kettle, and place the reaction kettle at 140°C for 6 hours. In a closed high-temperature environment, the ammonia water will decompose and volatilize, forming an alkaline environment with the water volatilized into the environment. , during the heating process, the aqueous solution does not penetrate into the crucible. Cobalt nitrate hexahydrate and potassium permanganate undergo a redox reaction in this alkaline environment to obtain a composite oxide, and the sample is transferred to 60°C for drying.

[0039] According to the method of embodiment case 1, obtain the catalyst prepared by oxidation-reduction method, SEM photo is as follows figure 1 shown...

Embodiment 2

[0044] Weigh 0.075 g (40-60 mesh) of the catalyst prepared by the method of Example 1 and the comparative example, and test the catalytic oxidation activity of toluene in a fixed bed reactor. The reaction conditions were 400 ppm toluene / 20% oxygen / 1.58% water / nitrogen, and the total flow rate was 100 mL / min. The reaction space velocity is 80000mL / (g.h). Activity curve as Figure 4 shown by Figure 4 It can be known that the catalytic combustion performance of the catalyst prepared by the method of the present invention is far superior to that of the comparative catalyst. It can be seen that the catalyst in Example 1 completely converts toluene at 280°C, T 90 and T 50 258 and 252°C, respectively. The catalyst of the comparative example needs to convert the toluene in the reaction gas completely at 320°C, and its T 90 and T 50 They are 319 and 310°C, respectively, which are much higher than the catalyst of Example 1.

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Abstract

The invention discloses a supported composite transition metal oxide, a preparation method thereof and an application thereof as a catalyst, and relates to the technical field of catalyst preparation.The preparation method comprises the following steps: fully and uniformly mixing an inert carrier with a pore channel structure, a transition metal salt and an oxidant to obtain mixed powder; addingan aqueous solution containing ammonia ions or an organic amine aqueous solution into a reaction kettle, wherein the aqueous solution containing the ammonia ions or the organic amine aqueous solutionis placed in the reaction kettle and is placed outside a reaction container; sealing the reaction kettle, and then placing the reaction kettle at a temperature of 120 DEG C to 200 DEG C for heating for 6-18h to make the transition metal salt and oxidant produce redox reaction to produce composite oxide, and loading the composite oxide in the channel of the carrier and the surface of the carrier toobtain the supported composite transition metal oxide. The preparation method of the catalyst is simple and can be operated easily, and the prepared catalyst has both activity and stability.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a supported composite transition metal oxide, its preparation method and its application as a catalyst. Background technique [0002] Volatile organic compounds are one of the pollutants of photochemical smog and ozone depletion, which mainly come from automobile exhaust, industrial emissions and process exhaust gases in the packaging and printing industry. These volatile organic waste gases have great harm to the ecological environment and human health, and urgently need to be treated. In the past two decades, in order to effectively remove VOCs pollution, a variety of effective VOCs removal technologies have been well developed. Among them, catalytic oxidation has been proven to be an effective and energy-saving method, and organic pollutants can be completely decomposed into harmless products such as carbon dioxide and water at relatively low temperatures. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48F23G7/07
Inventor 杨登尧李仁铸张龙郭利民
Owner 武汉时泰环保科技有限公司
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