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Ferro-cobalt bimetallic catalyst for catalyzing nitrous oxide (N2O) decomposition

A nitrous oxide and catalyst technology, which is applied in molecular sieve catalysts, nitrous oxide capture, physical/chemical process catalysts, etc., can solve the problems of low activity and catalyst deactivation, and achieve simple preparation process, high stability and stability good sex effect

Inactive Publication Date: 2012-03-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ion exchange degree of the Co-MOR catalyst still cannot reach 100%, and the residual hydroxyl protons will cause the catalyst to be deactivated in the presence of water, and the stability needs to be further improved.
On the other hand, Fe molecular sieves have very high anti-poisoning (SO 2 and H 2 O, etc.) and excellent stability, are also widely used in N 2 O catalyzes the decomposition reaction; however, its activity is lower than that of Co molecular sieves

Method used

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  • Ferro-cobalt bimetallic catalyst for catalyzing nitrous oxide (N2O) decomposition
  • Ferro-cobalt bimetallic catalyst for catalyzing nitrous oxide (N2O) decomposition
  • Ferro-cobalt bimetallic catalyst for catalyzing nitrous oxide (N2O) decomposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: CoFe-MOR catalyst with a space velocity of 30,000h -1 , N 2 O concentration of 0.5%, N at different temperatures 2 O decomposition reactivity. The reaction initiation temperature is 280°C, and the full conversion temperature is 430°C.

[0014] The preparation of CoFe-MOR: 1) under the condition of pH 6, use 0.1mol / L CoFe-containing 2+ The aqueous solution was exchanged with MOR for 24 hours, repeated 3 times, dried at 80°C for 24 hours, then heated to 500°C and roasted at a constant temperature in air for 4 hours to obtain Co-MOR;

[0015] 2) Under the condition of pH value 6, use 0.1mol / L Fe-containing 3+ The aqueous solution was exchanged with Co-MOR for 24 hours, repeated 3 times, dried at 80°C for 24 hours, and then heated to 500°C in air for 4 hours at a constant temperature to obtain a CoFe-MOR catalyst.

[0016] Catalytic reaction adopts fixed bed continuous flow reaction evaluation device, under N 2 The initial concentration of O is 0.5%, and th...

Embodiment 2

[0017] Example 2: Iron-cobalt-loaded mordenite (FeCo-MOR) catalysts prepared in different exchange sequences with a space velocity of 30,000 h -1 , N 2 O concentration of 0.5%, N at different temperatures 2 O decomposition activity. The reaction initiation temperature is 325°C, and the full conversion temperature is 525°C.

[0018] The preparation of FeCo-MOR: 1) under the condition of pH 6, use 0.1mol / L Fe-containing 3+ The aqueous solution was exchanged with MOR for 24 hours, repeated 3 times, dried at 80°C for 24 hours, then heated to 500°C and roasted at a constant temperature in air for 4 hours to obtain iron-loaded mordenite (Fe-MOR);

[0019] 2) Under the condition of pH 6, use 0.1mol / L Co 2+ The aqueous solution was exchanged with Fe-MOR for 24 hours, repeated 3 times, dried at 80°C for 24 hours, and then heated to 500°C in air for 4 hours at a constant temperature to obtain FeCo-MOR catalyst.

[0020]Catalytic reaction adopts fixed bed continuous flow reaction ev...

Embodiment 3

[0021] Example 3: CoFe-MOR catalyst with a space velocity of 30,000h -1 , N 2 O concentration is 0.5%, under different interference atmosphere (NO, O 2 , H 2 O), different temperature N 2 O decomposition activity. The results show that in NO, O 2 , H 2 When O exists alone and together, N 2 The 50% conversion temperatures of O are 355, 350, 375 and 380 °C, respectively.

[0022] The catalyst is the CoFe-MOR catalyst in Example 1, and the evaluation is carried out on the device in Example 1. The catalyst dosage is 0.1g, and the space velocity is 30,000h -1 , adjust various gas flows and balance gas He gas flow, so that the initial concentration N 2 O is 0.5%, O 2 5%, NO 0.1%, H 2 O is 2%. Program temperature from 200-600℃, examine N 2 O conversion rate. The results show that in NO, O 2 , H 2 When O exists alone and together, N 2 The 50% conversion temperatures of O are 355, 350, 375 and 380 °C, respectively.

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Abstract

The invention provides a ferro-cobalt bimetallic load mordenite catalyst for catalyzing the nitrous oxide (N2O) decomposition and a preparation method. The catalyst can be used for decomposing most or all N2O in a pollution discharge system into N2 and O2 under the conditions that the space velocity is 30000h<-1>, the reaction temperature is 400 to 500 DEG C, the N2O concentration is 0.1 to 30 percent, and the H2O is 2 to 10 percent. In addition, the catalyst has high stability, and the activity of the catalyst is not decayed after 100h of the continuous nitric plant tail gas emission simulation. The catalyst has the advantages that the preparation process is simple, the cost is low, the catalyst is used for the catalytic N2O decomposition, the activity is high, and the stability is good. The technology has wide applicability, can be used for the N2O emission reduction process (such as processes of nitric acid production, adipate production and the like) of multiple industry sources and has wide application prospects.

Description

technical field [0001] The present invention relates to nitrous oxide (N 2 O) Catalyzed decomposition catalyst and preparation thereof belong to the field of heterogeneous catalysis technology and environmental protection, specifically a catalyst for controlling air pollution, especially tail gas pollution from nitric acid plants and adipic acid plants, and a preparation method thereof. Background technique [0002] N 2 O is a colorless gas with a faint sweet smell, which is not obviously toxic to the human body. Inhalation of a small amount excites people's nerves and causes laughter (so commonly known as laughing gas); inhalation of a large amount can cause people to lose consciousness, and it is sometimes used as an anesthetic for minor operations. Currently N 2 O has been widely used in the electronics industry and medical fields, as well as semiconductor device manufacturing, pressure packaging and food industry and other fields. due to N 2 O is stable in nature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/24B01D53/86B01D53/56
CPCY02C20/10Y02P20/30
Inventor 郝郑平张新艳李进军程杰王海林王卓
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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