Preparation method and application of hydrophobic layered bimetallic oxide catalyst

A layered bimetallic and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of limited catalytic efficiency and easy spontaneous combustion of intermediate products. , to achieve the effect of better dispersion, larger comparison area and lower cost

Pending Publication Date: 2020-06-26
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pt / C, Pt / SDB (polystyrene-divinylbenzene) and Pt / rare earth oxide-based hydrophobic catalysts have been reported, but there are problems such as limited catalytic efficiency, and some raw materials and intermediate products are prone to spontaneous combustion.

Method used

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  • Preparation method and application of hydrophobic layered bimetallic oxide catalyst
  • Preparation method and application of hydrophobic layered bimetallic oxide catalyst
  • Preparation method and application of hydrophobic layered bimetallic oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The first step is the preparation of hydrophobic layered bimetallic oxide catalyst Pt / NiAl-LDO

[0044] Step A1: Add Al(NO 3 ) 3 ·9H 2 O, Ni(NO 3 ) 2 ·6H 2 O, hexamethylenetetramine, PtCl 2 , NaCl was added to deionized water at a molar ratio of 66:33:396:0.1:0.2 and stirred to obtain a mixed solution. Then the mixed solution was transferred to the autoclave and reacted at 150°C for 6 hours to obtain Pt ions. The reduced Pt / NiAl-LDHs catalyst precursor is finally filtered, washed and dried to obtain a powdery Pt / NiAl-LDHs catalyst precursor.

[0045] Step A2: The dry powdered Pt / NiAl-LDHs catalyst precursor obtained in step A1 is heated to 450°C at a heating rate of 3°C / min in an inert atmosphere (nitrogen or argon) protection, and calcined at this temperature After being kept for 2.5 hours, the hydrophobic layered bimetal oxide catalyst Pt / NiAl-LDO is obtained after cooling.

[0046] The second step is the preparation of Pt / NiAl-LDO / PTFE catalyst sheet

[0047] Step B1: first...

Embodiment 2

[0052] The first step is the preparation of hydrophobic layered bimetallic oxide catalyst Pt / NiAl-LDO

[0053] Step A1: Add Al(NO 3 ) 3 ·9H 2 O, Ni(NO 3 ) 2 ·6H 2 O, hexamethylenetetramine, PtCl 2 , NaCl was added to deionized water at a molar ratio of 66:33:792:3:6 and stirred to obtain a mixed solution. Then the mixed solution was transferred to the autoclave and reacted at 180°C for 24 hours to obtain Pt ions. The reduced Pt / NiAl-LDHs catalyst precursor is finally filtered, washed and dried to obtain a powdery Pt / NiAl-LDHs catalyst precursor.

[0054] Step A2: The dry powdered Pt / NiAl-LDHs catalyst precursor obtained in step A1 is heated to 600°C at a heating rate of 8°C / min under the protection of an inert atmosphere (nitrogen or argon), and calcined at this temperature After keeping the temperature for 4 hours, the hydrophobic layered bimetal oxide catalyst Pt / NiAl-LDO is obtained after cooling.

[0055] The second step is the preparation of Pt / NiAl-LDO / PTFE catalyst sheet

[00...

Embodiment 3

[0062] The first step is the preparation of hydrophobic layered bimetallic oxide catalyst Pt / NiAl-LDO

[0063] Step A1: Add Al(NO 3 ) 3 ·9H 2 O, Ni(NO 3 ) 2 ·6H 2 O, hexamethylenetetramine, PtCl 2 , NaCl was added to deionized water at a molar ratio of 66:33:396:1:1 and stirred to obtain a mixed solution. Then the mixed solution was transferred to the autoclave and reacted at 160°C for 18 hours to obtain Pt ion. The reduced Pt / NiAl-LDHs catalyst precursor is finally filtered, washed and dried to obtain a powdered Pt / NiAl-LDHs catalyst precursor.

[0064] Step A2: The dry powdered Pt / NiAl-LDHs catalyst precursor obtained in step A1 is heated to 500°C at a heating rate of 5°C / min in an inert atmosphere (nitrogen or argon) protection, and calcined at this temperature After holding for 3.5 hours, the hydrophobic layered bimetal oxide catalyst Pt / NiAl-LDO is obtained after cooling.

[0065] The second step is the preparation of Pt / NiAl-LDO / PTFE catalyst sheet

[0066] Step B1: first dispe...

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Abstract

The invention discloses a preparation method and application of a hydrophobic layered bimetallic oxide catalyst. The preparation method comprises the following steps of: firstly, preparing a Pt/NiAl-LDHs catalyst precursor of which Pt ions are reduced into elementary substance Pt by an in-situ precipitation reduction process; then calcining the catalyst precursor to obtain a catalyst Pt/NiAl-LDO of which the simple substance Pt grows on layered bimetallic metal oxide laminates and among the laminates in situ. According to the invention, the prepared catalyst Pt/NiAl-LDO is further prepared into a catalyst sheet for application. Firstly, the lattice positioning effect on LDHs laminates and the induction effect of the laminate growth process on the growth of active metal precursor microcrystals are utilized to implement high dispersion of active elemental Pt particles, thereby enhancing the catalytic efficiency, reducing the consumption of Pt noble metal and lowering the cost. And secondly, the carrier NiAl-LDO obtained by roasting NiAl-LDHs has better hydrophobic performance, so that the poisoning phenomenon of the traditional Pt/C catalyst in a high-humidity environment can be effectively prevented, the regeneration frequency of the catalyst is reduced, the operation efficiency of the system is improved, and the operation cost is reduced.

Description

Technical field [0001] The invention belongs to the field of catalysts, and specifically relates to a preparation method and application of a hydrophobic layered bimetal oxide catalyst. Background technique [0002] Tritium is a beta decay radionuclide of hydrogen, which has serious harm to the human body and the environment. In particular, the biological toxicity of tritium is increased by 25,000 times after it is oxidized into tritated water. The technology of concentrating or extracting tritium from light or heavy water is vital to nuclear power, military industry, and fusion energy. [0003] For inland nuclear power, the Chinese government has stipulated extremely stringent emission standards, requiring that the tritium activity at 1 km downstream of the site's discharge outlet should not be higher than 100Bq / L (GB14587). Due to the extremely low concentration of tritium-containing wastewater from nuclear power plants, and the extremely large amount of treatment, the standard ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10B01J35/02
CPCB01J23/892B01J35/0066B01J35/1004B01J35/026
Inventor 李佩龙胡小宇张鑫张志罗军洪文明邓立胡俊
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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