Preparation method of palladium-cobalt/carbon nitride composite material and product and application thereof

A technology of composite materials and carbon nitride, which is applied in the direction of nitrogen compounds, chemical instruments and methods, hydrogen/synthesis gas production, etc., can solve the problems of increasing the cost of catalysts and restricting the application of catalysts, so as to improve the aggregation degree and excellent photocatalytic production. Hydrogen performance, effect of enhancing electron density

Pending Publication Date: 2020-12-25
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, most of the relevant reports use nanoparticles of several noble metal elements to construct multi-metal catalysts, which increases the cost of the catalyst and greatly limits the application of the catalyst.
Co, as a transition metal element, has been widely studied to catalyze many important reactions due to its good activity and relatively low cost. There are still no reports on the formation of bimetallic catalysts formed by Co and Pd for photocatalytic formic acid decomposition.

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  • Preparation method of palladium-cobalt/carbon nitride composite material and product and application thereof
  • Preparation method of palladium-cobalt/carbon nitride composite material and product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of palladium cobalt / carbon nitride composite material, utilizes hard template method and sub-step impregnation reduction method to prepare a kind of palladium cobalt / carbon nitride composite material with heterojunction structure, prepares according to the following steps:

[0031] a. Preparation of mesoporous graphite phase carbon nitride: 5g of cyanamide 50% aqueous solution was added dropwise to 7.5g of Ludox HS40 silica sol under vigorous stirring, fully stirred and evaporated to dryness in a water bath at 65°C to obtain The solid was calcined in a tube furnace under the protection of nitrogen, the heating rate was 2.3°C / min, and it was kept at 550°C for 4 hours. After natural cooling, a yellow solid was obtained; after grinding the obtained solid, an excess of 4mol / L ammonium bifluoride solution was added and stirred for 48 hours to remove Si0 2 Template, the obtained solid is washed and dried to obtain light yellow mesoporous graphite phase carbon nitride; ...

Embodiment 2

[0036] A kind of palladium cobalt / carbon nitride composite material, similar to embodiment 1, is prepared according to the following steps:

[0037] a. Preparation of mesoporous graphite phase carbon nitride: 5g of cyanamide 50% aqueous solution was added dropwise to 7.5g of Ludox HS40 silica sol under vigorous stirring, fully stirred and evaporated to dryness in a water bath at 65°C to obtain The solid was calcined in a tube furnace under the protection of nitrogen, the heating rate was 2.3°C / min, and the temperature was kept at 600°C for 4 hours. After natural cooling, a dark yellow solid was obtained; after grinding the obtained solid, an excess of 4mol / L ammonium bifluoride solution was added and stirred for 48 hours to remove Si0 2 Template, the obtained solid is washed and dried to obtain yellow mesoporous graphite phase carbon nitride;

[0038] b. Loading of palladium-cobalt metal nanoparticles: take 100 mg of the prepared mesoporous graphite phase carbon nitride and u...

Embodiment 3

[0040] A kind of palladium cobalt / carbon nitride composite material, similar to embodiment 1, is prepared according to the following steps:

[0041] a. Preparation of mesoporous graphite phase carbon nitride: 5g of cyanamide 50% aqueous solution was added dropwise to 7.5g of Ludox HS40 silica sol under vigorous stirring, fully stirred and evaporated to dryness in a water bath at 65°C to obtain The solid was calcined in a tube furnace under the protection of nitrogen, the heating rate was 2.3°C / min, and it was kept at 550°C for 4 hours. After natural cooling, a yellow solid was obtained; after grinding the obtained solid, an excess of 4mol / L ammonium bifluoride solution was added and stirred for 48 hours to remove Si0 2 Template, the obtained solid is washed and dried to obtain light yellow mesoporous graphite phase carbon nitride;

[0042] b. Loading of palladium-cobalt metal nanoparticles: Take 100 mg of the prepared mesoporous graphite phase carbon nitride and ultrasonicall...

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Abstract

The invention discloses a preparation method of a palladium-cobalt/carbon nitride composite material and a product and an application thereof. The preparation of the palladium-cobalt/carbon nitride composite material with a heterojunction structure is achieved by utilizing a hard template method and a step-by-step impregnation reduction method, and by virtue of rich pore structure formation of mesoporous graphite-phase carbon nitride, the obtained palladium-cobalt nanoparticles are ultrafine nanoparticles and are attached to pore channels and the surface of the carbon nitride material. The product obtained by the method is the palladium-cobalt/carbon nitride composite material, due to the existence of a heterojunction structure between the palladium-cobalt nanoparticles and the carbon nitride, the surfaces of the palladium particles have high electron density, photoelectrons generated by the carbon nitride under illumination can be captured, therefore, the prepared composite material shows excellent photocatalytic hydrogen production performance and has great application potential in the field of hydrogen production from formic acid and other raw materials.

Description

technical field [0001] The invention belongs to the field of preparing nanometer metal-semiconductor composite materials, and in particular relates to a preparation method of a palladium cobalt / carbon nitride composite material and its product and application. Background technique [0002] As an ideal clean energy, hydrogen has high energy density and low environmental burden, and has wide application prospects, such as hydrogen fuel cells and hydrogen fuel engines. Hydrogen is set to play an important role in the future energy mix. Water, organic matter, and biomass raw materials can all be used to produce hydrogen. Among them, formic acid is an ideal raw material for hydrogen production, which has the advantages of non-toxicity, stability, and high hydrogen storage density. Two reactions may occur in the decomposition of formic acid, one is dehydrogenation reaction, which generates carbon dioxide and hydrogen; the other is dehydration reaction, which generates water and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/02B01J37/16C01B21/082C01B3/22
CPCB01J27/24B01J35/004B01J35/023B01J35/10B01J35/1004B01J37/0205B01J37/16C01B21/0605C01B3/22C01P2002/85C01B2203/0277C01B2203/066C01B2203/1052C01B2203/1064C01B2203/1082C01B2203/1211
Inventor 崔大祥王敬锋张文雨
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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