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Multi-dimensional micro-nano non-noble metal composite catalyst as well as preparation and application thereof

A composite catalyst and non-precious metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of low catalytic activity and high cost, and achieve the promotion of adsorption And dissociation, enhance the effect of catalytic activity

Active Publication Date: 2021-11-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of high cost and low catalytic activity of existing borane ammonium complex hydrolysis catalysts for hydrogen production. Dimensional micro-nano non-noble metal composite catalysts, including two-dimensional regular hexagonal Co 2 Mo 3 o 8 One-dimensional Co@Co composed of phase nanosheets and zero-dimensional Co or CoO phase nanoparticles supporting each other 2 Mo 3 o 8 or CoO@Co 2 Mo 3 o 8 Microrods have the advantages of simple preparation process and low material cost

Method used

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  • Multi-dimensional micro-nano non-noble metal composite catalyst as well as preparation and application thereof
  • Multi-dimensional micro-nano non-noble metal composite catalyst as well as preparation and application thereof
  • Multi-dimensional micro-nano non-noble metal composite catalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] CoO@Co 2 Mo 3 O 8 Preparation of -525 composite catalyst:

[0048] 1) Weigh 10mmol of cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and sodium molybdate dihydrate (Na 2 MoO 4 ·2H 2 O) were dissolved in 87.5 mL of deionized water, respectively, and dispersed for 30 min under magnetic stirring at 500 r / min. Transfer the dispersed sodium molybdate aqueous solution to the cobalt chloride solution, and continue to disperse with magnetic stirring at 500 r / min for 1 hour to obtain a CoMo precursor solution. The bright red CoMo precursor solution was transferred to a 250 mL polytetrafluoroethylene reactor, hydrothermally reacted at 160 °C for 6 hours, cooled at room temperature, and the product was washed with deionized water and absolute ethanol, respectively, and then placed in an oven for 80 It was dried at °C for 8 hours to obtain CoMo precursor powder.

[0049] 2) 100 mg of CoMo precursor powder was added to the porcelain boat and placed in a tube furnace at a volu...

Embodiment 2

[0051] Co@Co 2 Mo 3 O 8 Preparation of -550 composite catalyst:

[0052] The only difference from Example 1 is that it is heated to 550° C. in step 2), and the rest are the same as in Example 1 to obtain Co@Co 2 Mo 3 O 8 -550 composite catalyst.

Embodiment 3

[0054] Co@Co 2 Mo 3 O 8 Preparation of -575 composite catalyst:

[0055] The only difference from Example 1 is that it was heated to 575° C. in step 2), and the rest were the same as in Example 1 to obtain Co@Co 2 Mo 3 O 8 -575 composite catalyst.

[0056] CoO@Co prepared in Example 2 Mo 3 O 8 -525, Co@Co 2 Mo 3 O 8 -550, Co@Co 2 Mo 3 O 8 The scanning electron microscope photo of -575 composite catalyst is as follows figure 1 , figure 2 , image 3 shown. The macroscopic appearances of the three are almost the same, showing a one-dimensional rod-like shape with a length of 2-10 μm and a width of 200-500 nm. The rod-shaped structure is composed of two-dimensional regular hexagonal nano-sheets with a thickness of 20-50 nm and a side length of 50-200 nm and zero-dimensional nanoparticles with a thickness of 10-50 nm, with uniform size and complete structure. Co@Co 2 Mo 3 O 8 -575 composite catalyst with CoO@Co 2 Mo 3 O 8 -525 and Co@Co 2 Mo 3 O 8 The s...

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Abstract

The invention discloses a multi-dimensional micro-nano non-noble metal composite catalyst suitable for catalyzing hydrolysis of a borane ammonia complex to produce hydrogen, a preparation method of the multi-dimensional micro-nano non-noble metal composite catalyst and application in catalyzing hydrolysis of the borane ammonia complex and hydroboron to produce hydrogen. The preparation method comprises the following steps: carrying out a hydrothermal reaction on an aqueous solution containing cobalt chloride hexahydrate and sodium molybdate dehydrate at 150-180 DEG C for 4-8 hours, carrying out heat preservation on an obtained CoMo precursor at 525-575 DEG C in a hydrogen-argon mixed atmosphere for 1-3 hours, and cooling to room temperature; the multi-dimensional micro-nano non-noble metal composite catalyst is a multi-phase multi-scale space structure self-supporting non-noble metal composite catalyst, has a zero-dimensional, one-dimensional and two-dimensional characteristic composite structure, and comprises a two-dimensional Co2Mo3O8 phase regular hexagonal nanosheet, zero-dimensional Co or CoO phase nanoparticles and a one-dimensional Co@Co2Mo3O8 or CoO@Co2Mo3O8 microrod formed by mutual supporting of the two-dimensional phase and the zero-dimensional phase.

Description

technical field [0001] The invention relates to the field of catalytic hydrogen production, in particular to a multi-dimensional micro-nano non-precious metal composite catalyst suitable for catalyzing the hydrolysis of borane ammonia complexes to produce hydrogen, and its preparation and application. Background technique [0002] In recent years, due to the accelerating consumption of fossil fuels and increasing environmental pollution, alternative fuel systems based on renewable energy are urgently needed to be developed. Hydrogen energy is one of the most ideal green fuels, and it has attracted much attention due to its ultra-high energy density, high energy conversion efficiency and renewability. However, how to efficiently, safely and controllably store and use hydrogen is still a major issue in the hydrogen economy. [0003] Borane ammonia complex (NH 3 BH 3 ) has many inherent properties suitable for chemical hydrogen storage applications, such as very high gravime...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J23/882B01J35/00B01J35/02C01B3/06
CPCB01J23/75B01J23/882C01B3/06B01J35/393B01J35/50Y02E60/36
Inventor 肖学章何佳桓黄子薇陈立新
Owner ZHEJIANG UNIV
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