Double-layer structure catalyst for catalytic combustion of methane and preparation method thereof

A methane catalytic combustion, double-layer structure technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as being difficult to apply to methane catalytic combustion, and achieve a simple and easy preparation method, good effect, Highly active 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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Examples

Experimental program
Comparison scheme
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preparation example Construction

[0036] The preparation method of the double-layer structure catalyst that is used for methane catalytic combustion of the present invention may comprise the following steps:

[0037] S1. Preparation of rare earth composite alumina loaded Pd and rare earth composite molecular sieve loaded Pt.

[0038] In this step S1, preparing the rare earth composite molecular sieve loaded with Pt includes the following steps:

[0039] The molecular sieve is impregnated with the aqueous solution of the soluble rare earth salt, after the impregnation is completed, it is dried at 100-120°C and calcined at 500-1000°C to prepare the rare earth composite molecular sieve. 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 solubl...

Embodiment 1

[0053] Preparation of Pt-loaded rare earth composite molecular sieve: Weigh a certain amount of cerium nitrate, add it to deionized water, and stir until it is completely dissolved to form an aqueous solution of cerium nitrate; use equal volume impregnation method to impregnate 100g of ZSM-5 molecular sieve into the aqueous solution of cerium nitrate In the process, after stirring, drying at 120°C for 3 hours, and roasting at 550°C for 3 hours, the rare earth composite molecular sieve is obtained; cerium nitrate forms cerium oxide, and its weight content is 5% of the molecular sieve. A certain amount of platinum nitrate solution was weighed, and the prepared rare earth composite molecular sieve was impregnated into the platinum nitrate solution by an equal-volume impregnation method, stirred, dried at 120°C for 3 hours, and roasted at 550°C for 3 hours to obtain Pt loaded on the rare earth composite molecular sieve; The weight content of Pt in the rare earth composite molecular...

Embodiment 2

[0058] Prepare rare earth composite molecular sieve loaded Pt and rare earth composite alumina loaded Pd according to Example 1; weigh 60g of rare earth composite molecular sieve loaded Pt and mix with 90g deionized water, and the rest are the same as in Example 1 to prepare a rare earth composite molecular sieve loaded Pt coating The catalyst first product of layer; Take by weighing 60g rare earth composite alumina loaded Pd and mix with 90g deionized water, all the other are the same as embodiment 1, thereby prepare the catalyst with double-layer structure; The loading capacity of the coating in the catalyst is 120g / L, wherein The bottom layer is 60g / L and the upper layer is 60g / L.

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PUM

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Abstract

The invention discloses a double-layer structured catalyst used for methane catalytic combustion and a preparation method thereof. The double-layer structured catalyst comprises a carrier and an active coating arranged on the carrier, wherein the active coating comprises a rare-earth composite molecular sieve loaded Pt coating and a rare-earth composite aluminum oxide loaded Pd coating which are sequentially arranged; and a weight ratio of the rare-earth composite molecular sieve loaded Pt coating to the rare-earth composite aluminum oxide loaded Pd coating is 1:(1-1.4). The double-layer structured catalyst disclosed by the invention can be used for catalytic combustion of low-concentration methane, wherein the active coating is of a double-layer structure composed of the rare-earth composite molecular sieve loaded Pt coating and the rare-earth composite aluminum oxide loaded Pd coating; the preparation method is simple and easy to implement, the prepared catalyst is high in activity, and the catalytic combustion effect on methane is good.

Description

technical field [0001] The invention relates to a catalyst, in particular to a double-layer structure catalyst for catalytic combustion of methane 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/44
Inventor 周国丰白杉董振营郭耘韩玉峰黄永雄王丽王超郭杨龙
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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