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A kind of Ni-based bimetallic nanocapsule catalyst and its preparation and application

A technology of nanocapsules and catalysts, which is applied in Ni-based bimetallic nanocapsule catalysts and its preparation, and in the application fields of biomass gas reforming reactions. Effect and other issues, to achieve the effect of reducing the potential of the reduction electrode, promoting rapid formation, and avoiding mutual interference

Active Publication Date: 2021-02-02
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited active metal exposed surface (Ni particles are usually larger than 10nm, the larger the particle, the less exposed active surface) and the dense shell thickness of core-shell catalysts, the active Ni sites are not enough for the rapid diffusion of reactants and convert
In addition, the metal particles encapsulated in the shell cavity can move freely, resulting in poor metal-support interaction, which is not suitable for the reforming reaction process with high methane concentration

Method used

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  • A kind of Ni-based bimetallic nanocapsule catalyst and its preparation and application
  • A kind of Ni-based bimetallic nanocapsule catalyst and its preparation and application
  • A kind of Ni-based bimetallic nanocapsule catalyst and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Weigh 10 g of polyoxyethylene (10) cetyl ether into a conical flask, add cyclohexane to 100 mL, heat and stir at 40° C. When it is observed that the solution becomes clear, add 5 mL of 2.0 mol / L nickel nitrate and copper nitrate mixed solution (Ni:Cu molar ratio is 1:1), stir until well mixed, then add 2 mL of hydrazine hydrate. After aging for 0.5h, increase the rotation speed and add a mixed solution of 2ml of concentrated ammonia water (25wt.%) and 13mL of deionized water, then slowly add 10mL of TEOS, after hydrolysis for 1h, add isopropanol to break the emulsion, and centrifuge. Finally, the obtained sample was dried at 110° C. for 12 h, and then calcined at 500° C. at a rate of 1° C. / min in an air atmosphere to obtain bimetallic nanocapsule catalyst 1 .

[0036] The calcined catalyst 1 was pressed into tablets and sieved, and 0.1g of the 20-40 mesh catalyst was taken, mixed evenly with quartz sand and then put into a reaction tube, and then reduced for ...

Embodiment 2

[0037] Example 2: Weigh 20 g of polyoxyethylene (10) cetyl ether into a conical flask, add cyclohexane to 100 mL, heat and stir at 45° C. When it is observed that the solution becomes clear, add 7 mL of 1.8 mol / L nickel nitrate and cobalt nitrate mixed solution (Ni:Co molar ratio is 2:1), stir until well mixed, then add 3 mL of hydrazine hydrate. After aging for 1.5 hours, increase the speed and add a mixed solution of 1.5ml of concentrated ammonia water and 13.5mL of deionized water, then slowly add 12.5mL of TEOS, after hydrolysis for 6 hours, add isopropanol to break the emulsion, and centrifuge. Finally, the obtained sample was dried at 80° C. for 24 h, and then calcined at 600° C. at a rate of 1.5° C. / min in an air atmosphere to obtain bimetallic nanocapsule catalyst 2 .

[0038] The calcined catalyst 2 was pressed into tablets and sieved, and 0.1g of 40-60-mesh catalyst was taken, mixed evenly with quartz sand, and then put into a reaction tube, and then reduced for 1 ho...

Embodiment 3

[0039] Example 3: Weigh 34g of polyoxyethylene (10) cetyl ether into a conical flask, add cyclohexane to 100mL, heat and stir at 50°C. When it is observed that the solution becomes clear, add 5 mL of 1.5 mol / L nickel nitrate and copper nitrate mixed solution (Ni:Cu molar ratio is 4:1), stir until well mixed, then add 4 mL of hydrazine hydrate. After aging for 3 hours, increase the rotation speed and add a mixed solution of 1ml of concentrated ammonia water and 14mL of deionized water, then slowly add 10mL of TEOS, after hydrolysis for 12h, add isopropanol to break the emulsion, and centrifuge. Finally, the obtained sample was dried at 100° C. for 12 h, and then calcined at 700° C. at a rate of 2° C. / min in an air atmosphere to obtain bimetallic nanocapsule catalyst 3 .

[0040] The calcined catalyst 3 was pressed into tablets and sieved, and 0.1g of 20-40 mesh catalyst was taken, mixed evenly with quartz sand and then put into a reaction tube, and then reduced for 1 hour at 70...

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Abstract

The invention discloses a Ni-based bimetallic nanocapsule catalyst and its preparation and application. The catalyst is composed of a capsule shell and a metal core; the capsule shell is silicon oxide, and the metal core is bimetallic nickel-copper or nickel-cobalt particles; The total content of nickel-copper or nickel-cobalt in the nanocapsule catalyst is 10-20 wt%, the particle size of nickel-copper or nickel-cobalt bimetallic particles is 1-4nm, and the capsule cavity is (6.5-7.5)nm×(15-60) nm, the thickness of the capsule shell is 5.5±3nm; the nanocapsule catalyst has a two-stage channel structure, wherein the pores of 3-4nm originate from the penetrating channels of the shell layer, and the pores of 12-15nm originate from the hollow body cavity of the capsule. The catalyst's unique spatial confinement structure (high nanonization of metal particles, anchoring of metal particles inside the shell, proper shell cavity space, and steric hindrance of the capsule structure) and the synergistic effect of bimetals can be used in high-temperature reactions. It effectively inhibits the sintering of active components and the formation of carbon deposits, and has good activity and stability in biomass gas reforming reactions.

Description

technical field [0001] The invention relates to a catalyst with a nanocapsule structure, in particular to a Ni-based bimetallic nanocapsule catalyst and a preparation method thereof, as well as the application of the catalyst in biomass gas reforming reactions. Background technique [0002] Biomass gas mainly comes from the anaerobic degradation of biomass in crop straw, forest waste and industrial wastewater. Its main components are methane (50%-70%) and carbon dioxide (30%-50%). It can be used as a natural raw material for methane carbon dioxide reforming to produce synthesis gas, and then applied to hydrogen production, fuel cells or synthetic oil products and other fields. However, methane is usually slightly more than carbon dioxide in the composition of biomass gas. Excessive methane will easily promote the sintering of catalyst active metals and cause serious carbon deposition, which requires higher catalysts. [0003] Nickel-based catalysts are considered to be pref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/10B01J35/02B82Y30/00B82Y40/00C01B3/40B01J35/00
CPCB82Y30/00B82Y40/00C01B3/40B01J23/755C01B2203/0238C01B2203/1058C01B2203/1241B01J35/396B01J35/50B01J35/40B01J35/647Y02P20/52
Inventor 王长真赵永祥李海涛仇媛周玮
Owner SHANXI UNIV
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