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Preparation method of cobalt-based metal organic framework derivative catalyst for catalytic decomposition of N2O

An organic framework, catalytic decomposition technology, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, separation methods, etc., to achieve the effects of excellent activity, high preparation cost, and excellent redox performance

Active Publication Date: 2020-12-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In summary, the existing patented technologies are mainly aimed at nitric acid plants, adipic acid plants, etc. 2 O. For flue gas with simple components, the catalytic reaction temperature range is generally high (>400°C), while for coal-fired boilers and industrial boilers with complex flue gas components, especially the tail of circulating fluidized bed boilers N 2 O Governance research is still blank

Method used

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  • Preparation method of cobalt-based metal organic framework derivative catalyst for catalytic decomposition of N2O
  • Preparation method of cobalt-based metal organic framework derivative catalyst for catalytic decomposition of N2O
  • Preparation method of cobalt-based metal organic framework derivative catalyst for catalytic decomposition of N2O

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Experimental program
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Effect test

Embodiment 1

[0032]Weigh 0.025mol of 2-methylimidazole and 0.025mol of triethylamine and dissolve them in 250ml of deionized water. Stir magnetically and sonicate for 20 minutes until the drug is completely dissolved. Slowly introduce 250mL dissolved with 0.01mol Co(NO 3 ) 2 ·6H 2 O solution, after standing at room temperature for 10 minutes, the solution was centrifuged at a high speed (5000r / min) and washed. The collected solid precipitate was dried in an oven at 110 °C for 6 h to obtain the precursor ZIF-67. The precursor was further heated to 650°C at a heating rate of 2°C / min in nitrogen, and then annealed after pyrolysis at 650°C for 3 hours to obtain the cobalt nanocomposite catalyst Co-650N supported on the porous carbon material.

Embodiment 2

[0034] The precursor ZIF-67 in Example 1 was heated to 550°C at a heating rate of 2°C / min in nitrogen gas, and then pyrolyzed for 3 hours. After annealing, the cobalt nanocomposite catalyst Co-550N supported on the porous carbon material was obtained. .

Embodiment 3

[0036] The precursor ZIF-67 in Example 1 was heated to 750°C at a heating rate of 2°C / min in nitrogen, and then pyrolyzed for 3 hours. After annealing, the cobalt nanocomposite catalyst Co-750N supported on the porous carbon material was obtained. .

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Abstract

The invention relates to the technical field of catalytic materials and air pollution control, and aims to provide a preparation method of a cobalt-based metal organic framework derivative catalyst for catalytic decomposition of N2O. The preparation method comprises the following steps: dissolving 2-methylimidazole and a deprotonating agent in deionized water, and adding a Co (NO3) 2.6 H2O solution while fully stirring; standing for 10min at room temperature, then centrifugally washing, collecting solid precipitate and drying to obtain a precursor with a zeolite imidazate skeleton structure; firing the precursor in an inert gas atmosphere for pyrolysis; and naturally annealing and cooling to room temperature to obtain the cobalt-based metal organic framework derivative catalyst. The catalyst provided by the invention has the advantages of very large specific surface area, good dispersion performance of active sites, and excellent oxidation-reduction performance and adsorption and desorption capability; and the introduced deprotonating agent can greatly improve the coordination rate of metal ions and organic ligands, so that the reaction is rapidly carried out in an aqueous solution, and possibility is provided for industrial rapid synthesis. The catalyst has high activity, sulfur poisoning resistance and heating activity regeneration capacity.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials and air pollution control, and specifically relates to a method for directly catalytically decomposing N in boiler flue gas at medium and low temperatures. 2 O, Cobalt nanocomposite catalysts based on metal-organic frameworks (MOFs) derived on porous carbon materials and their preparation methods. Background technique [0002] Nitrous Oxide (Nitrous Oxide, N 2 O) has a strong ability to absorb atmospheric infrared radiation, and its greenhouse effect potential is about CO 2 310 times that of CH 4 and CO 2 the third largest greenhouse gas. N 2 O is chemically stable at room temperature and can exist stably in the troposphere for a long time. After entering the stratosphere, it can further react to produce NO, which consumes and destroys the ozone layer like conventional nitrogen oxides, resulting in an ozone hole. [0003] In recent decades, circulating fluidized bed (CFB) combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28B01J31/22B01J35/02B01D53/86B01D53/56B01J35/00
CPCB01J31/28B01J31/22B01D53/8628B01D2258/0283B01D2257/402B01J35/40Y02C20/10
Inventor 王智化何勇朱燕群杨卫娟唐海荣周志军刘建忠周俊虎岑可法
Owner ZHEJIANG UNIV
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