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Bamboo joint/coated non-noble metal SO2 electrochemical oxidation catalyst as well as preparation method and application thereof

A technology for oxidation catalysts and non-precious metals, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of high cost of electro-oxidation catalysts, and achieve mass production, mass transfer, and high ratio The effect of surface area

Active Publication Date: 2018-10-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the noble metal SO 2 The cost of electro-oxidation catalyst is high, and the object of the present invention is to provide a kind of high-efficiency SO 2 Electrochemical oxidation performance of bamboo / coated non-noble metal SO 2 Electrochemical oxidation catalyst, while providing its preparation method and application

Method used

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  • Bamboo joint/coated non-noble metal SO2 electrochemical oxidation catalyst as well as preparation method and application thereof
  • Bamboo joint/coated non-noble metal SO2 electrochemical oxidation catalyst as well as preparation method and application thereof
  • Bamboo joint/coated non-noble metal SO2 electrochemical oxidation catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 1g ferric ammonium citrate, add it to 20mL deionized water, the molar concentration is 0.1mol L -1 , fully stirred to disperse; take 2.4g melamine and add it to 100mL 100℃ deionized water, the molar concentration is 0.19mol L -1 , fully dissolve and stir; add ferric ammonium citrate solution into melamine solution, stir well to combine, add 0.5g NKF-11 molecular sieve, adjust temperature to 80°C, stir at constant temperature and evaporate to dryness. Put the precursor mixture into the tube furnace, Ar atmosphere, at 2 °C min -1 Rise to 600°C, keep at constant temperature for 2h; take out after cooling. At 40°C, the carbide in 1mol L -1 Stand in NaOH for 24h; wash with deionized water, then in 5% NH 4 F and CH 3 COOH mixed solution (NH 4 F and CH 3 The mass ratio of COOH is 1:1) to stand for 24h; wash and dry. Then at 10℃min -1 Rise to 700°C for secondary carbonization, and keep at constant temperature for 2 hours. Cool naturally, and grind to obtain the ca...

Embodiment 2

[0049] Take 1g ferric ammonium citrate, add it to 20mL deionized water, the molar concentration is 0.1mol L -1 , fully stirred to disperse; take 2.4g melamine and add it to 100mL 100℃ deionized water, the molar concentration is 0.19mol L -1 , fully dissolve and stir; add ferric ammonium citrate solution into melamine solution, stir well to combine, add 0.5g NKF-11 molecular sieve, adjust temperature to 80°C, stir at constant temperature and evaporate to dryness. Put the precursor mixture into the tube furnace, Ar atmosphere, at 10 °C min -1 Rise to 500°C, keep at constant temperature for 2h; take out after cooling. At 40°C, the carbide in 1mol L -1 Stand in NaOH for 24h; wash with deionized water, then in 5% NH 4 F and CH 3 Stand in the COOH mixed solution for 24h; wash and dry. Then at 10℃min -1 Rise to 700°C for secondary carbonization, and keep at constant temperature for 2 hours. Natural cooling, grinding to obtain the catalyst, its SO 2 Electrooxidation properties...

Embodiment 3

[0051] in 1g L -1 Na 2 SO 3 (H 2 SO 4 ), test the SO of the catalyst prepared by Example 1 2 Oxidation performance and compared with Pt / C catalyst. Linear voltage sweep condition: 5mV s -1 ,1600r min -1 . The catalyst has better SO in the low oxidation range 2 Oxidation performance, but there is a certain gap with Pt / C; after the oxidation potential is higher than 1.186V, it has better SO2 than Pt / C 2 Oxidation properties. Catalyst of the present invention is more suitable for the oxidation potential of 0.9-1.4V scope, test result is as follows figure 1 shown.

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Abstract

The invention provides a bamboo joint / coated non-noble metal SO2 electrochemical oxidation catalyst as well as a preparation method and application thereof. According to the preparation method, precursors are combined by a constant-temperature chelating reaction; a porous molecular sieve template is filled with the Fe, N and C precursors; carbonization treatment is carried out to form an active site and an active component; the template is removed to obtain a carbon-based catalyst; secondary carbonization is carried out, so that the electrical conductivity, surface functional groups and the like of the catalyst is modulated to obtain the non-noble metal SO2 electrochemical oxidation catalyst with a bamboo-like / coated structure. The catalyst is cheap and available in raw materials, simple in preparation device and likely to realize mass production. The catalyst provided by the invention is a non-noble metal catalyst, has a relatively high specific surface area, a large pore volume and atypical mesoporous structure, is capable of providing more catalytic active sites and is beneficial to mass transfer. The catalyst has SO2 electrochemical oxidation capacity equivalent to that of Pt / C in a high potential region and has an important application value and use prospect for researches in the fields of SO2 electrochemical oxidation and desulfuration.

Description

technical field [0001] The present invention relates to a bamboo joint / coated non-precious metal SO 2 Electrochemical oxidation catalyst and its preparation method and application. Background technique [0002] SO 2 It is a common air pollutant that causes serious environmental problems such as acid rain and smog. Fossil fuel combustion is an anthropogenic emission of SO 2 The main source of sulfur dioxide and nitrogen oxide pollution is currently the most urgent task in the field of air pollution control (Xu Baodong, Flue Gas Desulfurization Process Handbook, 2012). Flue gas desulfurization is the control of SO 2 The most effective way is of great significance. The traditional flue gas desulfurization technology is large in scale, complex in equipment, high in processing cost, easy to cause secondary pollution, and the sulfur concentration in the tail gas is still high. The electro-oxidative desulfurization technology is to convert SO 2 Oxidized to sulfuric acid ( ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04B01J29/76B01J29/03B01J27/24B01J35/10B01D53/86B01D53/50H01M4/90
CPCB01D53/8609H01M4/9091B01J27/24B01J29/0333B01J29/044B01J29/76B01J35/618B01J35/617B01J35/615B01J35/647Y02E60/50
Inventor 侯明赵卿蒋尚峰邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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