Catalyst for catalytic decomposition of nitrous oxide and a preparation method

A nitrous oxide and catalyst technology, which is applied in molecular sieve catalysts, nitrous oxide capture, physical/chemical process catalysts, etc., can solve problems such as catalyst deactivation, achieve simple preparation process, broad application prospects, and nitrous oxide catalysis The effect of high decomposition activity

Inactive Publication Date: 2012-02-15
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 proto...

Method used

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  • Catalyst for catalytic decomposition of nitrous oxide and a preparation method
  • Catalyst for catalytic decomposition of nitrous oxide and a preparation method
  • Catalyst for catalytic decomposition of nitrous oxide and a preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: CoIn-MOR catalyst, space velocity is 30,000h -1 , N 2 O concentration is 0.5%, N at different temperatures 2 O decomposition reaction activity. The initial reaction temperature is 300°C, and the total conversion temperature is 450°C.

[0014] Preparation of CoIn-MOR: 1) Under the condition of pH 6, use 0.1 mol / L of Co 2+ Exchange the aqueous solution with MOR for 24 hours, repeat 3 times, dry at 80°C for 24 hours, and then heat to 500°C and calcine in air at a constant temperature for 4 hours to obtain Co-MOR;

[0015] 2) Under the condition of pH 6, use 0.1mol / L containing In 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 and calcined in air at a constant temperature for 4 hours to obtain CoIn-MOR catalyst.

[0016] The catalytic reaction adopts a fixed-bed continuous flow reaction evaluation device. 2 The initial concentration of O is 0.5%, and the space velocity is 30,000h -1 ...

Embodiment 2

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

[0018] Preparation of InCo-MOR: 1) Under the condition of pH 6, use 0.1mol / L of In 3+ The aqueous solution was exchanged with MOR for 24 hours, repeated 3 times, dried at 80°C for 24 hours, and then heated to 500°C and calcined in air at a constant temperature for 4 hours to obtain indium-supported mordenite (In-MOR);

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

[0020] The catalytic reaction adopts a fixed-bed continuo...

Embodiment 3

[0021] Example 3: CoIn-MOR catalyst, space velocity is 30,000h -1 , N 2 O concentration is 0.5%, under different interference atmosphere (NO, O 2 , H 2 O), different temperatures N 2 O's 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 395, 390, 400 and 395°C, respectively.

[0022] The catalyst was the CoIn-MOR catalyst in Example 1, and the evaluation was performed on the device in Example 1. The amount of catalyst is 0.1g, and the space velocity is 30,000h -1 , Adjust various gas flow and balance gas He gas flow to make the initial concentration N 2 O is 0.5%, O 2 Is 5%, NO is 0.1%, H 2 O is 2%. Program temperature rise from 200-600℃, investigate 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 395, 390, 400 and 395°C, respectively.

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Abstract

The invention provides a cobalt-indium bimetal loaded mordenite catalyst used for catalytic decomposition of nitrous oxide and a preparation method thereof. Under the circumstances of a space velocity of 30,000h<-1>, a reaction temperature of 400-500DEG C, an N2O concentration of 0.1-30%, an H2O content of 2-10%, the catalyst can decompose most or all of N2O in a pollutant discharge system into N2 and O2. With high stability, the catalyst does not weaken in activity after a continuous simulation of nitric acid plant tail gas discharge for 100h. The catalyst of the invention has the advantages of simple preparation process, low cost, high activity in catalytic decomposition of nitrous oxide, and good stability. With wide applicability, the technology in the invention can be used in a lot of discharge reduction processes (like nitric acid production, adipic acid production and other processes) of N2O from industrial sources, thus boasting very wide application prospects.

Description

Technical field [0001] The present invention relates to nitrous oxide (N 2 O) Catalytic decomposition catalyst and its preparation belong to the field of heterogeneous catalysis technology and its environmental protection. Specifically speaking, it is a catalyst for the treatment of air pollution, especially the treatment of 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, faintly sweet gas, which is not toxic to humans. Inhaling a small amount can excite one's nerves and cause laughter (hence the common name of laughing gas); inhaling a larger amount can make a person unconscious, and sometimes it is 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 industries. Since N 2 O is stable in nature and has no obvious toxic effects...

Claims

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Application Information

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IPC IPC(8): B01J29/24B01D53/56B01D53/86
CPCY02C20/10Y02P20/30
Inventor 郝郑平张新艳李进军麻春艳薛雯娟窦广玉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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