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Copper/porous carbon catalyst and preparation method and application thereof

A technology of porous carbon and catalyst, applied in the field of copper/porous carbon catalyst and its preparation, can solve the problems of low specific surface area, reduced catalyst stability, reduced active sites, etc., to achieve high specific surface area, reduce internal diffusion resistance, Increase the effect of active sites

Pending Publication Date: 2021-08-31
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively low specific surface area of ​​the traditional carrier, the loading and dispersion of the active components are limited, resulting in a reduction in the active sites exposed by the active components, which greatly reduces the activity of the catalyst and the stability of long-term use.

Method used

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  • Copper/porous carbon catalyst and preparation method and application thereof
  • Copper/porous carbon catalyst and preparation method and application thereof
  • Copper/porous carbon catalyst and preparation method and application thereof

Examples

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preparation example Construction

[0026] The invention provides a preparation method of a copper / porous carbon catalyst, comprising the following steps:

[0027] (1) After mixing copper precursor, auxiliary agent, biomass-based porous carbon and water, aging and drying are performed in turn to obtain a precursor;

[0028] (2) calcining the precursor obtained in the step (1) to obtain a calcined body;

[0029] (3) reducing the calcined body obtained in the step (2) to obtain a copper / porous carbon catalyst.

[0030] In the present invention, unless otherwise specified, the raw materials used are conventional commercially available products in the field.

[0031] In the present invention, unless otherwise specified, all operations performed are at room temperature.

[0032] In the present invention, after mixing copper precursor, auxiliary agent, biomass-based porous carbon and water, aging and drying are performed in turn to obtain the precursor.

[0033] In the present invention, the material ratio of the c...

Embodiment 1

[0067] 1. Preparation method of biomass-based porous carbon:

[0068] 1) washing 17.3565g of pine wood chips in turn, drying at 105° C. for 24h, and pulverizing to obtain 11.6357g of pretreated pine wood chips;

[0069] 2) 10.9656g of pretreated pine wood chips obtained in step 1) and 13.0486gH 3 PO 4 The mixture was mixed in a mass ratio of 1:1.2, immersed in a water bath at 80°C for 12 hours, then placed in an atmospheric muffle furnace in a nitrogen atmosphere for activation at 500°C for 90min, and then added 10wt% hydrochloric acid and placed in a water bath at 80°C for magnetic stirring. Washed for 30min, then washed with deionized water until neutral, and dried to obtain 9.8942g biomass-based porous carbon material. The specific surface area of ​​the material was analyzed by the BET method, and the pore volume of the material was analyzed by the BJH method. Analysis was carried out, and the specific surface area of ​​the prepared biomass-based porous carbon material wa...

Embodiment 2

[0080] According to the method of Example 1, biomass-based porous carbon materials and copper / porous carbon catalysts were prepared, and the prepared copper / porous carbon catalysts were applied to methanol hydrogen production by the same method.

[0081] Among them, in the process of preparing biomass-based porous carbon materials, 20.6895g sycamore wood chips were used as biomass materials, and 20.6895g pine wood chips and 24.6582g activator H were pretreated. 3 PO 4 The mass ratio of 1:1.2; the impregnation temperature is 60°C, and the impregnation time is 12h; the activation temperature is 400°C, and the activation time is 1.2h; the acid used for the pickling is 15wt% hydrochloric acid; The specific surface area of ​​the prepared biomass-based porous carbon material measured by the same method in Example 1 is 687m 2 ·g -1 , the hole volume is 0.826cm 3 ·g -1 , with an average pore size of 4.811 nm;

[0082] In the process of preparing copper / porous carbon catalyst, 0.3...

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Abstract

The invention provides a copper / porous carbon catalyst and a preparation method and application thereof, belonging to the field of catalytic materials. According to the preparation method provided by the invention, all the components are subjected to a uniform reaction and form a stable structure in a subsequent roasting and reduction process by utilizing aging; bio-based porous carbon has a high specific surface area, and the loading capacity and dispersity of the active component copper are improved, so active sites are increased, and catalytic activity is improved; a developed pore channel and a three-dimensional communicated hierarchical pore structure are beneficial to reducing the internal diffusion resistance of reactants and products and effectively reducing CO selectivity; and meanwhile, the porous carbon contains more microcrystals, and has certain reaction activity and catalytic activity similar to crystal defects, and a large number of various functional groups on the surface of the porous carbon further improve the catalytic activity. When the catalyst is applied to hydrogen production by methanol steam reforming, the conversion rate of methanol can reach 92%, and CO selectivity is as low as 0%.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a copper / porous carbon catalyst and a preparation method and application thereof. Background technique [0002] Hydrogen is a clean secondary energy carrier, which has the advantages of burning more heat, no environmental pollution by combustion products, unrestricted raw materials, matching and compatibility with all current energy systems, and can be easily converted into electricity and heat. Advantages such as higher energy efficiency. In addition, as a hydrogen source carrier, methanol has the advantages of wide source, renewable, high carbon-hydrogen ratio, and can be carried out at low temperature (200 ℃ ~ 400 ℃), which can realize fast and efficient on-site reforming in mobile equipment. hydrogen. However, the reaction process belongs to a non-steady state system, and a catalyst needs to be added to promote the efficient and stable reaction. [0003] The carrier is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J35/10B01J37/08B01J37/18B01J21/18C01B3/32
CPCB01J23/72B01J21/18B01J37/082B01J37/18C01B3/326C01B2203/0233C01B2203/1076C01B2203/1082C01B2203/1223B01J35/394B01J35/618B01J35/638B01J35/647
Inventor 潘立卫李金晓张晶钟和香韩新宇易丹阳赵艾琳
Owner DALIAN UNIV
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