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Preparation method of catalyst used for carrying out catalytic combustion on volatile organic compound containing low-concentration methane

A catalytic combustion and catalyst technology, which is applied in combustion methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of reduced catalyst methane combustion activity, long catalyst preparation process, and precious metal loading Advanced problems, achieve excellent catalytic effect, improve activity and hydrothermal stability, and evenly disperse precious metals

Inactive Publication Date: 2016-02-03
JIANGSU EVERGREEN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the preparation is complicated and the catalyst cost is too high
The article (AppliedCatalysisA: General203(2000)37-45) developed a chlorine-free noble metal Pd-supported methane combustion catalyst, which can basically complete the complete catalytic combustion of methane at 420°C. The disadvantage is that the catalyst operates for a long period of time in the presence of water vapor , methane conversion rate decreased
The article (AppliedCatalysisA: General226(2002)281-291) studies in detail the dual loading of Pt-Pd / Al in water vapor 2 o 3 Due to the influence of methane combustion on the catalyst, a water vapor-resistant methane combustion catalyst has been developed. The disadvantage is that the catalyst preparation process is long and the cost of the catalyst is high.
[0005] Based on the analysis of the above articles and patents, in the preparation of supported noble metal catalysts in the prior art to deal with the combustion of VOCs containing methane components, there are generally high noble metal loadings, high costs, or complicated preparation procedures, and the catalyst’s long-term methane combustion activity is reduced. question

Method used

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  • Preparation method of catalyst used for carrying out catalytic combustion on volatile organic compound containing low-concentration methane
  • Preparation method of catalyst used for carrying out catalytic combustion on volatile organic compound containing low-concentration methane
  • Preparation method of catalyst used for carrying out catalytic combustion on volatile organic compound containing low-concentration methane

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Experimental program
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Effect test

Embodiment 1

[0032] Spherical γ-Al 2 o 3 Carrier (specific surface area 320m 2 / g, pore volume 0.4ml / g) after drying in an oven, put it into a 0.8mol / L NaOH solution at a mass ratio of 8:1, treat it at 80°C for 2 hours, wash, and dry it Equal volumes are immersed in the solution of palladium nitrate and nickel nitrate, the loading amount of Pd is 0.5% of the catalyst mass, NiO is 10% of the catalyst mass, the impregnation time is 30 minutes, and dried in an air atmosphere oven at 120°C for 8 hours , and finally calcined at 500°C for 6 hours in the air atmosphere of the muffle furnace to obtain catalyst A; catalyst A was treated with N 2 The specific surface area of ​​the adsorption full analysis test is 292m 2 / g, the pore volume is 0.36ml / g. TEM electron microscope analysis shows that the particle size of the active components is concentrated at 2-4nm (such as figure 2 ).

Embodiment 2

[0034] Spherical TiO 2 Carrier (specific surface area 286m 2 / g, pore volume 0.3ml / g) after drying in an oven, put it into a 1.2mol / L NaOH solution at a mass ratio of 5:1, treat it at 90°C for 2 hours, wash, and dry it Equal volumes are immersed in the solution of palladium nitrate, tetraammine platinum nitrate and cerium nitrate, the loading amount is 0.3% of the catalyst mass by Pd, 0.05% of the catalyst mass by Pt, CeO 2 10% of the mass of the catalyst, impregnated for 120 minutes, dried in an air oven at 100°C for 6 hours, and finally calcined at 800°C for 3 hours in an air atmosphere in a muffle furnace to obtain catalyst B. Catalyst B via N 2 The specific surface area of ​​the adsorption full analysis test is 262m 2 / g, the pore volume is 0.26ml / g. TEM electron microscope analysis showed that the particle size of the active components was concentrated at 2-4nm.

Embodiment 3

[0036] Spherical Ti-Al oxide support (specific surface area 200m 2 / g, pore volume 0.5ml / g) after drying in an oven, put it into a 1.0mol / L NaOH solution at a mass ratio of 6:1, treat it at 85°C for 2 hours, wash, and dry it Equal volumes are immersed in the solution of palladium nitrate, tetraammine platinum nitrate and nickel nitrate, the loading amount of Pd is 0.25% of the mass of the catalyst, Pt is 0.10% of the mass of the catalyst, NiO is 15% of the mass of the catalyst, and the immersion time is 90 Minutes, dried in an air atmosphere oven at 150°C for 10 hours, and finally calcined at 700°C for 5 hours in an air atmosphere in a muffle furnace to obtain catalyst C. Catalyst C via N 2 The specific surface area of ​​the adsorption full analysis test is 202m 2 / g, the pore volume is 0.46ml / g. TEM electron microscope analysis showed that the particle size of the active components was concentrated at 3-8nm.

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Abstract

The invention discloses a preparation method of a catalyst used for carrying out catalytic combustion on a volatile organic compound containing low-concentration methane. The catalyst consists of an active carrier, noble metal and assistant metallic oxide, wherein the noble metal and the assistant metallic oxide are loaded on the active carrier; the quality of the noble metal is 0.05 percent to 0.8 percent of active elements by element quality in final catalyst; the quality of the assistant metallic oxide is 0.0 percent to 20 percent of the quality of the final catalyst; the catalyst is prepared in a way that active ingredients are used as a carrier, and after the active ingredients are processed by aqueous alkali, the active ingredients dip in a solution which loads compound containing the active elements of the noble metal and the assistant metallic oxide, and the obtained product is dried in the shade, dried and roasted. The catalyst is used for the organic volatilization hydrocarbon catalytic combustion which contains low-concentration methane, and the catalytic combustion transformation effect of the methane is excellent while almost complete non-methane hydrocarbon transformation can be obtained.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, in particular to a method for preparing a catalyst used in a catalytic combustion process, in particular to a method for preparing a noble metal catalyst for catalytic combustion of volatile organic compounds. Background technique [0002] With the rapid development of modern industry and transportation, the demand for energy has also increased, and a large amount of harmful gases emitted in the industrial process have caused great harm to human health, and environmental pollution has become a major global problem. . Catalytic oxidation of hydrocarbons and their derivatives (including low-concentration methane and volatile organic compounds) is an effective way to make full use of energy and achieve zero emissions of harmful gases. Volatile organic compounds (VOCs) usually refer to volatile organic compounds with a saturated vapor pressure greater than 133.3Pa at room temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/10B01J35/10F23G7/07
Inventor 孙秋新
Owner JIANGSU EVERGREEN NEW MATERIAL TECH
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