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Monolithic catalyst for methane catalytic combustion and preparation method thereof

A monolithic catalyst, methane catalytic combustion technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the difficulty of accurately controlling the loading of precious metals and waste of resources , the solution is not easy to recycle, etc., to achieve the effect of high methane catalytic combustion activity, smooth appearance, and less precious metal consumption

Inactive Publication Date: 2014-10-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are some unavoidable problems in the impregnation method. The concentration of the impregnation solution changes at any time during the impregnation process, which makes it very difficult to accurately control the loading of precious metals. Moreover, the residual solution after impregnation is not easy to recover, resulting in huge resources. waste

Method used

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  • Monolithic catalyst for methane catalytic combustion and preparation method thereof
  • Monolithic catalyst for methane catalytic combustion and preparation method thereof
  • Monolithic catalyst for methane catalytic combustion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation of palladium sol takes palladium nitrate and citric acid as raw materials, and dilute nitric acid and distilled water as solvents.

[0042] The preparation steps are as follows:

[0043] (1) Weigh 100mg of Pd(NO 3 ) 2 ﹒ 2H 2 O was dissolved in 15ml of 10% dilute nitric acid by volume fraction to obtain solution A.

[0044] (2) Weigh 200 mg of citric acid and dissolve it in 10 ml of water to obtain solution B.

[0045] (3) Mix solution A prepared in step (1) with solution B prepared in step (2), add concentrated NH 3 ﹒ 2H 2 O mass fraction (25%~28%) to pH 6~8 and stir evenly.

[0046] (4) The solution obtained in step (3) was heated to 60° C. in a constant temperature water bath and kept for 2 hours to obtain a transparent sol.

Embodiment 2

[0048] The preparation of the palladium sol takes palladium acetate and citric acid as raw materials, and glacial acetic acid and distilled water as solvents.

[0049] The preparation steps are as follows:

[0050] (1) Weigh 120.8mg of Pd(CH 3 COO) 2 ﹒ 2H 2 O was dissolved in 15ml of glacial acetic acid and heated to obtain cloudy liquid A.

[0051] (2) Weigh 170.3 mg of citric acid and dissolve it in 10 ml of water to obtain solution B.

[0052] (3) Mix the turbid solution A prepared in step (1) with the solution B prepared in step (2), and add concentrated NH 3 ﹒ 2H 2 O (mass fraction 25% to 28%) until the pH is 6 to 8 and stirred evenly.

[0053] (4) The solution obtained in step (3) was heated to 70° C. in a constant temperature water bath and kept for 2 hours to obtain a transparent sol.

Embodiment 3

[0055] The preparation of palladium sol takes palladium chloride and citric acid as raw materials, and n-butanol, concentrated hydrochloric acid and distilled water as solvents.

[0056] The preparation steps are as follows:

[0057] (1) Weigh 159.8mg of PdCl 2 Dissolve in 15ml of n-butanol, add 10ml of concentrated hydrochloric acid dropwise and heat to obtain solution A.

[0058] (2) Weigh 500.4 mg of citric acid and dissolve it in 10 ml of n-butanol to obtain solution B.

[0059] (3) Mix solution A prepared in step (1) with solution B prepared in step (2), add concentrated NH 3 ﹒ 2H 2 O (mass fraction 25% to 28%) until the pH is 6 to 8 and stirred evenly.

[0060] (4) The solution obtained in step (3) was heated to 60° C. in a constant temperature water bath and kept for 2 hours to obtain a transparent sol.

[0061] (5) Dry the sol obtained in step (4) at 100° C. for several hours to form a wet gel, and heat-treat at 400° C. for 1 hour to obtain dry rubber powder.

...

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Abstract

The invention discloses a monolithic catalyst for methane catalytic combustion and a preparation method thereof. The monolithic catalyst comprises a carrier, a coating on the carrier, and precious metal loaded on the coating, wherein the carrier is cordierite honeycomb ceramics, and the coating is a gamma-Al2O3 sol transition coating and a CeO2-Y2O3 sol assistant coating. The preparation method comprises the steps of impregnating the cordierite honeycomb ceramics in gamma-Al2O3 sol, drying and roasting to obtain a carrier coated with the gamma-Al2O3 sol transition coating; impregnating the carrier coated with the gamma-Al2O3 sol transition coating in CeO2-Y2O3 sol to obtain a carrier; and with Pd sol as an active ingredient, and coating the carrier with the Pd sol to obtain the monolithic catalyst, wherein the loading amount of the palladium accounts for 0.05-0.2 percent of the total weight of the monolithic catalyst, and the Pd sol is palladium nitrate sol, palladium acetate sol or palladium chloride sol. The monolithic catalyst has high catalytic combustion conversion rate to methane, and consumes few amount of Pd.

Description

technical field [0001] The invention relates to a noble metal monolithic catalyst, in particular to a monolithic catalyst for catalytic combustion of methane and a preparation method thereof. Background technique [0002] As people pay more and more attention to environmental pollution and energy shortage, natural gas is considered to be one of the cleanest energy sources due to its abundant reserves, low price, convenient use, high thermal efficiency, and low pollution. However, due to the high combustion temperature (1600°C) of its main component methane, the combustion products of natural gas in the air contain NO x , CO, etc. may also cause environmental pollution. Catalytic combustion is considered to be the most effective way to solve this problem. [0003] Methane is the most stable hydrocarbon, it is usually difficult to activate or oxidize, and the catalytic combustion temperature of methane is relatively high, a large amount of water vapor will be generated durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63C10L10/00
Inventor 廖恒成左沛元刘苗苗
Owner SOUTHEAST UNIV
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