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Pt/MOx catalyst and application thereof in toluene catalytic combustion

A technology of catalysts and oxides, applied in the direction of combustion methods, combustion types, incinerators, etc., can solve problems such as cumbersome operations, environmental pollution, and strict requirements for the preparation process, and achieve good stability, high activity, and low environmental costs. Effect

Inactive Publication Date: 2014-02-05
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are relatively cumbersome to operate, and a large amount of waste water and waste gas will be generated in the synthesis process of the catalyst. If it is discharged directly without treatment, it will pollute the environment again, and the reproducibility of the catalyst prepared by these methods is not particularly good, which affects the operation of the preparation process. stricter requirements

Method used

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  • Pt/MOx catalyst and application thereof in toluene catalytic combustion
  • Pt/MOx catalyst and application thereof in toluene catalytic combustion
  • Pt/MOx catalyst and application thereof in toluene catalytic combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Pt / MO x Catalyst preparation

[0029] The precursor 34mg Pt 2 (dba) 3 Add 100ml of propylene carbonate, and react in a stainless steel reactor at 3.0MPa and room temperature (20°C) for 2 hours to obtain the reaction solution, namely 100ml of Pt nanoparticle solution; the carrier MO x (MO x = TiO 2 , SiO 2 , ZrO 2 、Al 2 o 3 ) was added to the obtained Pt nanoparticle solution, stirred overnight under electric stirring, filtered, and the filter cake was washed with acetone several times and then dried to obtain 1% Pt / MO x catalyst.

Embodiment 2

[0031] Weigh 0.5g Pt / TiO 2 The catalyst is placed in a quartz tube reactor with an inner diameter of 8mm, the gas flow rate is adjusted so that the concentration of toluene is 1000ppm, the reaction space velocity (GHSV) is 18000ml / (g h), and the reaction temperature range is from 80°C to 180°C. Toluene concentration and products were determined by gas chromatography.

[0032] The reaction results show that the conversion rate of toluene reaches 98% after passing through the catalyst system at 110°C.

[0033] Pt / TiO 2 Catalyst activity evaluation results are attached figure 1 .

Embodiment 3

[0035] Weigh 0.5g Pt / SiO 2 The catalyst is placed in a quartz tube reactor with an inner diameter of 8mm, the gas flow rate is adjusted so that the concentration of toluene is 1000ppm, the reaction space velocity (GHSV) is 18000ml / (g h), and the reaction temperature range is from 80°C to 180°C. Toluene concentration and products were determined by gas chromatography.

[0036] The reaction results show that the conversion rate of toluene reaches 100% after passing through the catalyst system at 110°C.

[0037] Pt / SiO 2 Catalyst activity evaluation results are attached figure 1 .

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Abstract

The invention discloses a Pt / MOx catalyst and an application thereof in toluene catalytic combustion. The preparation method of the catalyst comprises the steps that: Pt2(dba)3 is added to the propylene glycol carbonate, such that a mixture is obtained; the mixture is subjected to a stirring reaction under room temperature in 1-3MPa hydrogen atmosphere; stirring is stopped after 1-2h, and the solution is fetched, such that a solution comprising Pt nano-particles is obtained; the obtained solution comprising Pt nano-particles is mixed with a metal oxide carrier; magnetic stirring is carried out, such that the Pt nano-particles are completed adhered to the metal oxide carrier; the solution is filtered, and washing and drying are carried out, such that the Pt / MOx catalyst is obtained. The Pt / MOx catalyst provided by the invention can be applied in toluene catalytic combustion. With the synthesis method of the catalyst provided by the invention, waste gas or waste water is not product, and environment cost is low, such that expanded-scale industrialized production can be carried out. The prepared catalyst has high activity and good stability. With the catalyst, low-concentration toluene can be completely oxidized into carbon dioxide and water under low temperature, and no other product is produced.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to a noble metal catalyst Pt / MO x and its application in catalytic combustion of toluene. Background technique [0002] Toluene is the most common and high-concentration VOCs in indoor and outdoor air. It mainly comes from waste gas and wastewater discharged from the production processes of petrochemical, coal chemical, paint, pesticide, pharmaceutical, etc., as well as exhaust gas from automobiles. The release of low-concentration VOCs is not only the main component of air pollutants, which can form photochemical smog, but also one of the main sources of PM2.5, which has serious harm to human health and ecology, among which benzene is a known carcinogen thing. China's air pollutant comprehensive emission standards clearly stipulate the maximum allowable emission concentration, maximum allowable emission rate and fugitive emission limit of VOCs. Therefore, it is urgent to effec...

Claims

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Application Information

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IPC IPC(8): B01J23/42F23G7/07
Inventor 严新焕敖平
Owner ZHEJIANG UNIV OF TECH
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