Monolithic catalyst for catalytic combustion of methane and preparation method thereof

A monolithic catalyst, methane catalytic combustion technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as difficulty in applying methane catalytic combustion, and achieve a simple and easy preparation method and high catalyst activity. , good effect

Active Publication Date: 2019-08-30
CHINA NUCLEAR POWER TECH RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite oxide catalysts include cerium-based oxide catalysts, double-doped composite oxide catalysts, doped rare earth double perovskite catalysts, etc., supported noble metal catalysts include palladium-based catalysts, etc.; the current catalysts are still difficult to apply Catalytic combustion of low concentration (10ppm) methane

Method used

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

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preparation example Construction

[0033] The preparation method of the monolithic catalyst for methane catalytic combustion of the present invention may comprise the following steps:

[0034] S1. Preparation of rare earth composite alumina loaded Pd and rare earth composite molecular sieve loaded Pt.

[0035] In this step S1, the preparation of rare earth composite alumina supported Pd includes the following steps:

[0036] Alumina is impregnated with an aqueous solution of soluble rare earth salts, dried at 100-120°C and calcined at 500-1000°C after impregnation to obtain rare earth composite alumina. Among them, the soluble rare earth salt is nitrate or acetate; the nitrate is one or more of lanthanum nitrate, cerium nitrate, praseodymium nitrate and praseodymium nitrate; the acetate is lanthanum acetate, cerium acetate, praseodymium acetate and praseodymium acetate one or more of. After high-temperature roasting, the soluble rare earth salt forms rare earth oxides, which correspond to one or more of lanth...

Embodiment 1

[0048] Preparation of Pd supported on rare earth composite alumina: Weigh a certain amount of lanthanum nitrate, add it to deionized water, and stir until it is completely dissolved to form an aqueous solution of lanthanum nitrate; 2 o 3 Immerse in an aqueous solution of lanthanum nitrate, stir, dry at 120°C for 3 hours, and roast at 550°C for 3 hours to obtain rare earth composite alumina; lanthanum nitrate forms lanthanum oxide, and its weight content is 5% of alumina. Weigh a certain amount of palladium nitrate solution, and use the equal volume impregnation method to impregnate the prepared rare earth composite alumina into the palladium nitrate solution, stir, dry at 120°C for 3 hours, and roast at 550°C for 3 hours to obtain the supported rare earth composite alumina Pd; the weight content of Pd in ​​the rare earth composite alumina supported Pd is 1%.

[0049] Preparation of Pt-loaded rare earth composite molecular sieve: Weigh a certain amount of cerium nitrate, add i...

Embodiment 2

[0052] Prepare rare earth composite alumina-loaded Pd and rare earth composite molecular sieve loaded Pt according to Example 1; respectively weigh 80g rare earth composite alumina loaded Pd and 40g rare earth composite molecular sieve loaded Pt, and the rest of the steps are the same as in Example 1 to prepare monolithic catalysts. The coating loading in the monolithic catalyst was 120 g / L.

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Abstract

The invention discloses an integrated catalyst applied to catalytic combustion of methane and a preparation method thereof. The integrated catalyst comprises a carrier and an active coating arranged on the carrier, wherein the active coating is prepared from rare earth composite aluminum oxide loaded with Pd and rare earth composite molecular sieve loaded with Pt according to a weight ratio of (1 to 1)-(5 to 1). The integrated catalyst can be applied to catalytic combustion of low-concentration methane; the active coating is prepared by mixing rare earth composite aluminum oxide loaded with Pd with rare earth composite molecular sieve loaded with Pt. The preparation method is simple and practicable; the prepared catalyst is high in activity and has an excellent catalytic combustion effect on methane.

Description

technical field [0001] The invention relates to a catalyst, in particular to an integral catalyst for methane catalytic combustion and a preparation method thereof. Background technique [0002] Methane (CH 4 ) are the most stable hydrocarbons and are generally difficult to activate or oxidize. CH 4 Catalytic combustion is under the action of a catalyst to make CH 4 A complete oxidation reaction occurs to produce carbon dioxide (CO 2 ) and water (H 2 O). Compared with conventional flame combustion, CH 4 Catalytic combustion has the characteristics of low ignition temperature, complete combustion, and a wide range of applicable methane concentrations, so it has broad application prospects in exhaust gas purification, power generation, and industrial furnaces. [0003] At present, the catalysts for catalytic combustion of methane mainly include composite oxide catalysts and supported noble metal catalysts. Composite oxide catalysts include cerium-based oxide catalysts,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/44
Inventor 周国丰黄永雄郭耘白杉韩玉峰董振营龚有为卢冠忠王超
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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