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Composite oxide catalyst for catalytic decomposition of N2O at medium and low temperature as well as preparation method and application of composite oxide catalyst

A composite oxide and low-temperature catalysis technology, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, separation methods, etc., to achieve excellent catalytic activity, enhanced electron donating ability, and tolerance to impurity gases strong effect

Pending Publication Date: 2022-02-01
LIAONING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] To solve the existing N 2 It is difficult for O decomposition catalysts to have both high catalytic activity and strong resistance to NO x , O 2 、H 2 The problem of impurity gases such as O, the present invention provides a kind of preparation method is simple, and low-temperature catalytic activity is good, in actual N 2 It has application value in O elimination and is used for direct catalytic decomposition of N 2 O is O 2 and N 2 Formulation composition and general manufacturing method of the composite oxide catalyst

Method used

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  • Composite oxide catalyst for catalytic decomposition of N2O at medium and low temperature as well as preparation method and application of composite oxide catalyst
  • Composite oxide catalyst for catalytic decomposition of N2O at medium and low temperature as well as preparation method and application of composite oxide catalyst
  • Composite oxide catalyst for catalytic decomposition of N2O at medium and low temperature as well as preparation method and application of composite oxide catalyst

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Effect test

Embodiment 1

[0030] Embodiment 1 A kind of middle and low temperature catalytic decomposition N 2 Composite Oxide Catalyst S(1)-Gd of O 0.06 co

[0031] 5.8206g Co(NO 3 ) 2 ·6H 2 O and 0.5416g Gd(NO 3 ) 3 ·6H 2 O was miscible in 100 mL deionized water to obtain a precursor solution, and an equal volume of 0.5 mol L was added dropwise to the mixed solution under continuous stirring at 40 °C -1 Na 2 CO 3 The solution was aged until the pH of the solution reached 9.3. After aging for 2 years, the obtained precipitate was suction filtered, washed, dried at 110°C, and then calcined at 500°C for 3 hours in an air atmosphere to obtain the S(1) catalyst. The Gd content in the resulting catalyst is expressed as Gd 2 o 3 The calculated mass percentage is 11.93wt.%.

Embodiment 2

[0032] Embodiment 2 A kind of middle and low temperature catalytic decomposition N 2 Composite Oxide Catalyst S(2)-Gd of O 0.01 co

[0033] Prepared according to the method described in Example 1, the difference is that with 0.0903g Gd(NO 3 ) 3 ·6H 2 O replaces 0.5416g Gd(NO 3 ) 3 ·6H 2 O, get S(2) catalyst. The Gd content in the resulting catalyst is expressed as Gd 2 o 3 The calculated mass percentage is 2.21wt.%.

Embodiment 3

[0034] Embodiment 3 A kind of middle and low temperature catalytic decomposition N 2 Composite Oxide Catalyst S(3)-Gd of O 0.02 co

[0035] Prepared according to the method described in Example 1, the difference is that with 0.1806g Gd(NO 3 ) 3 ·6H 2 O replaces 0.5416g Gd(NO 3 ) 3 ·6H 2 O, get S(3) catalyst. The Gd content in the resulting catalyst is expressed as Gd 2 o 3 The calculated mass percentage is 4.32wt.%.

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Abstract

The invention relates to the technical field of catalytic materials and air pollution control, and particularly relates to a composite oxide catalyst for catalytic decomposition of N2O at medium and low temperatures and a preparation method and application of the composite oxide catalyst. The catalyst is KyGdxM and comprises an active component and an auxiliary agent, the active component is one or more of transition metal oxides Co3O4, NiO and CuO, the auxiliary agent is one of rare earth metal Gd or alkali metal K, y refers to the molar ratio of the added alkali metal K to the transition metal M, y is larger than 0 and smaller than or equal to 0.03, x refers to the molar ratio of the added rare earth metal Gd to the transition metal M, and x is larger than 0 and smaller than or equal to 0.1. The catalyst prepared by the invention not only has excellent N2O decomposition catalysis activity, but also shows relatively strong resistance to NOx, O2 and H2O in an actual N2O waste gas treatment process, and is suitable for being applied to actual industrial production.

Description

technical field [0001] The invention relates to a medium and low temperature catalytic decomposition of N 2 The composite oxide catalyst of O and its preparation method and application belong to the technical field of catalytic materials and air pollution control. Background technique [0002] As a greenhouse gas, N 2 O owns more than CO 2 , CH 4 Stronger greenhouse effect potential. In addition, it can also exist stably in the troposphere, and once it is transported to the stratosphere, it will cause high damage to the ozone layer. In addition to nature, N 2 The source of O is mainly human industrial production, including the production of nitric acid and adipic acid, and the tail gas emitted from fuel combustion. Therefore, the elimination of N emissions from industrial production 2 O has become one of the urgent problems to be solved in the field of environment today. For decades, direct catalytic N 2 O breaks down to N 2 and O 2 has long been recognized as eli...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01D53/86B01D53/56
CPCB01J23/83B01J23/002B01D53/8628B01J2523/00B01D2257/402B01D2258/06B01J35/23B01J2523/13B01J2523/375B01J2523/845Y02C20/10
Inventor 熊英赵玉梅于海彪王月娇崔俊硕高婧冯晓庚娄振宁单炜军
Owner LIAONING UNIVERSITY
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