Zeolite-supported metal type hydrogen and tritium removal catalyst and application thereof

A technology for supporting metals and catalysts, applied in molecular sieve catalysts, physical/chemical process catalysts, radioactive purification, etc., can solve the problems of poor reactivity at room temperature, difficult to start, poor high temperature stability of organic polymer carriers, etc., and achieves good water vapor resistance. Highly reactive effect

Inactive Publication Date: 2019-12-13
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used catalyst is Pt / Al with alumina as the catalyst support 2 o 3 Catalysts, but most of these catalysts have poor room temperature reaction performance and water vapor resistance
Although the use of organic polymer materials as the carrier of platinum catalysts (Fusion Sci. Technol., 56, 141~147 (2009); J. Plasma Fusion Res. Series, 9, 332~337 (2010)) can improve the room temperature reactivity and Water vapor resistance, but the high temperature stability of the organic polymer carrier is poor
[0003] For hydrogen elimination fields such as passive hydrogen elimination in nuclear power plants and hydrogen elimination in storage batteries, Pt / Al, which uses alumina as a catalyst carrier, is also used. 2 o 3 Catalysts also face the problem of poor room temperature reactivity, especially under the condition of water vapor, and difficult to start

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The zeolite-supported metal-type dehydrogenation and tritium-removal catalyst of the present embodiment is prepared through the following steps:

[0026] Preparation of zeolite: silica source (silica gel, silica sol, water glass, sodium silicate, SiO 2 powder, tetraethyl silicate, etc.), aluminum source (sodium aluminate, aluminum nitrate, pseudo-boehmite, gibbsite, aluminum isopropoxide, etc.), alkali (sodium hydroxide, potassium hydroxide, etc.), amine (tetrapropylammonium bromide, ethylenediamine, tetrapropylammonium hydroxide, etc.), the molar ratio of water is 1SiO 2 : (0~0.033)Al: (0~5.0)OH – :(0~2000)H 2 O ratio mixed, then hydrothermal reaction at 100 °C ~ 200 °C for 10 h ~ 72 h, the product was separated and washed, and then roasted at 400 °C ~ 600 °C for 6 h ~ 20 h.

[0027] Impregnation method: Mix the required amount of noble metal salt solution (chloroplatinic acid, chloropalladium acid) with the zeolite carrier, evaporate the solution to dryness at ...

Embodiment 2

[0029] The zeolite-supported metal-type dehydrogenation and tritium-removal catalyst of the present embodiment is prepared through the following steps:

[0030] Preparation of zeolite: silica source (silica gel, silica sol, water glass, sodium silicate, SiO 2 powder, tetraethyl silicate, etc.), aluminum source (sodium aluminate, aluminum nitrate, pseudo-boehmite, gibbsite, aluminum isopropoxide, etc.), alkali (sodium hydroxide, potassium hydroxide, etc.), amine (tetrapropylammonium bromide, ethylenediamine, tetrapropylammonium hydroxide, etc.), the molar ratio of water is 1SiO 2 : (0~0.033)Al: (0~5.0)OH – :(0~2000)H 2 O ratio mixed, evaporated to dryness at 50 °C ~ 100 °C to powder, the powder was hydrothermally converted under water vapor at 130 °C ~ 200 °C for 10 h ~ 70 h. After the product is separated and washed, it is roasted at 400 °C ~ 600 °C for 6 h ~ 20 h.

[0031] Ion exchange method: the required amount of metal salt solution (Pt(NH 3 ) 4 Cl 2 , the weigh...

Embodiment 3

[0033] The zeolite-supported metal-type dehydrogenation and tritium-removal catalyst of the present embodiment is prepared through the following steps:

[0034] Preparation of zeolite: silica source (silica gel, silica sol, water glass, sodium silicate, SiO 2 powder, tetraethyl silicate, etc.), aluminum source (sodium aluminate, aluminum nitrate, pseudo-boehmite, gibbsite, aluminum isopropoxide, etc.), alkali (sodium hydroxide, potassium hydroxide, etc.), amine (tetrapropylammonium bromide, ethylenediamine, tetrapropylammonium hydroxide, etc.), the molar ratio of water is 1SiO 2 : (0~0.033)Al: (0~5.0)OH - :(0~2000)H 2 O ratio mixed, evaporated to dryness at 50 °C ~ 100 °C to powder, the powder under water vapor, 130 °C ~ 200 °C hydrothermal conversion for 10 h ~ 70 h. After the product was separated and washed, it was roasted at 400 °C ~ 600 °C for 6 h ~ 20 h.

[0035] Ion exchange method: the required amount of metal salt solution (Pt(NH 3 ) 4 Cl 2 , the weight per...

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PUM

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Abstract

The invention discloses a zeolite-supported metal type hydrogen and tritium removal catalyst and application thereof. The catalyst is composed of Metal / zeolite, zeolite is used as a carrier, a precious metal is used as an active component, and the weight percentage of the precious metal is less than or equal to 10%. The zeolite-supported metal type hydrogen and tritium removal catalyst is an inorganic hydrogen / tritium removal precious metal catalyst with high room-temperature reaction activity and good water vapor resistance under the condition of low-concentration hydrogen / tritium, and can beflexibly and conveniently applied to passive hydrogen removal in nuclear power stations, hydrogen removal of storage batteries and radiation protection in tritium-containing places.

Description

technical field [0001] The invention belongs to the technical field of tritium removal catalysts and hydrogen elimination catalysts, and in particular relates to a zeolite-supported metal type hydrogen and tritium removal catalyst and its application. Background technique [0002] Tritium is a kind of hydrogen isotope, which is a highly mobile radionuclide, which is extremely harmful to the environment and people. Therefore, any process involving tritium must implement strict radiation protection and environmental emission requirements. Catalytic purification of tritium-containing gas is an important means of radiation protection. The catalytic purification technology of catalytic oxidation combined with adsorption is a main technology, and the catalyst is the core of catalytic purification technology. The commonly used catalyst is Pt / Al with alumina as the catalyst support 2 o 3 Catalysts, but most of these catalysts have poor room temperature reaction performance and w...

Claims

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Application Information

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IPC IPC(8): B01J29/068B01J29/74G21F9/02B01D53/86B01D53/46
CPCB01J29/068B01J29/743G21F9/02B01D53/8671B01D2257/108B01J2229/18
Inventor 肖超杨勇谭昭怡
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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