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Cobalt catalyst and preparation method thereof

A technology of cobalt catalyst and catalytic activity, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., which can solve the problem of increasing catalytic reaction operation steps and production costs, difficulty in product separation and purification, and shedding of active components and other problems, to achieve the effect of abundant raw materials, improved catalytic efficiency, and low cost

Active Publication Date: 2021-10-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cobalt-based catalysts are usually supported catalysts, which are prone to shedding and loss of active components during use, resulting in gradual deactivation of the catalyst and difficulty in product separation and purification, increasing the operating steps and production costs of the entire catalytic reaction process

Method used

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  • Cobalt catalyst and preparation method thereof
  • Cobalt catalyst and preparation method thereof
  • Cobalt catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] (1) Put 1500mg of sublimated sulfur powder in the corundum boat of the tube furnace, seal it and dry it in 100mL / min nitrogen atmosphere at 30°C for 2h to remove the contained moisture.

[0094] (2) Submerge 280mg of cobalt foam in absolute ethanol and ultrasonically clean it for 10min, and then dry it at 60°C for 4h.

[0095] (3) the dry sublimed sulfur powder that step (1) obtains and the cobalt foam that obtains in the step (2) are placed in the corundum boat of tube furnace jointly, pass into high-purity nitrogen as full-range protective gas after sealing, wherein nitrogen The flow rate was 50mL / min; the temperature was raised to 350°C at a rate of 5°C / min, and after holding for 0.5h, it was naturally cooled to room temperature to obtain the precursor. Among them, the mass ratio of sublimated sulfur powder to cobalt foam is 5.4:1.

[0096] (4) The precursor obtained in step (3) is used as the anode, the graphite rod is used as the cathode, and the mercury / mercuric ...

Embodiment 2

[0098] (1) Put 1500mg of sublimated sulfur powder in the corundum boat of the tube furnace, seal it and dry it in 100mL / min nitrogen atmosphere at 30°C for 2h to remove the contained moisture.

[0099] (2) Submerge 500 mg of cobalt foam in absolute ethanol and ultrasonically clean it for 10 min, and then dry it at 60° C. for 4 h.

[0100] (3) the dry sublimed sulfur powder that step (1) obtains and the cobalt foam that obtains in the step (2) are placed in the corundum boat of tube furnace jointly, pass into high-purity nitrogen as full-range protective gas after sealing, wherein nitrogen The flow rate was 50mL / min; the temperature was raised to 350°C at a rate of 5°C / min, and after holding for 0.5h, it was naturally cooled to room temperature to obtain the precursor. Among them, the mass ratio of sublimated sulfur powder to cobalt foam is 3:1.

[0101] (4) The precursor obtained in step (3) is used as the anode, the graphite rod is used as the cathode, and the mercury / mercur...

Embodiment 3

[0104] (1) Put 500mg of sublimated sulfur powder in a corundum boat of a tube furnace, seal it and dry it in a nitrogen atmosphere of 100mL / min at 30°C for 2h to remove the contained moisture.

[0105] (2) Submerge 250 mg of cobalt foam in absolute ethanol and ultrasonically clean it for 10 min, and then dry it at 60° C. for 4 h.

[0106] (3) the dry sublimed sulfur powder that step (1) obtains and the cobalt foam that obtains in the step (2) are placed in the corundum boat of tube furnace jointly, pass into high-purity nitrogen as full-range protective gas after sealing, wherein nitrogen The flow rate was 50mL / min; the temperature was raised to 350°C at a rate of 5°C / min, and after holding for 0.5h, it was naturally cooled to room temperature to obtain the precursor. Among them, the mass ratio of sublimated sulfur powder to cobalt foam is 2:1.

[0107](4) The precursor obtained in step (3) is used as the anode, the graphite rod is used as the cathode, and the mercury / mercuri...

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Abstract

The invention discloses a cobalt catalyst and a preparation method thereof. The cobalt catalyst comprises a carrier and a catalytic active substance; the carrier is a cobalt-based substrate material; the catalytic active substance grows on the surface of the carrier; and the morphology of the catalytic active substance is hydrangea-shaped nanospheres. The catalyst is a self-grown integral nanosphere catalyst, the surface of the catalyst is of a three-dimensional structure assembled by nanosheets, the specific surface area is high, catalytic active sites can be fully exposed, and the catalytic efficiency is improved. Compared with a nanowire-shaped catalyst, the catalyst provided by the invention has better self-supporting property, active components are not easy to aggregate and fall off in the application process, and the catalyst has longer service life.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysis, and in particular relates to a cobalt catalyst and a preparation method thereof. Background technique [0002] Noble metals have excellent catalytic properties and are stars in the field of catalysis. However, noble metals such as palladium, platinum, gold, ruthenium, and iridium have limited available reserves and high prices, so large-scale use of noble metals for industrial catalysis is not a long-term solution. Faced with the above problems, people have focused their attention on the development and utilization of transition metals with multiple valence states. [0003] As one of the transition metals, cobalt itself has certain catalytic properties, and is relatively rich in reserves and low in price compared with noble metals. Practical cobalt-based catalysts are mostly cobalt oxides, sulfides and borides, etc., and their catalytic ability is comparable to that of noble metals i...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/00B01J35/08B01J37/34C25B1/04C25B3/23C25B3/05C25B3/07C25B11/075
CPCB01J37/348B01J23/75C25B1/04B01J35/33B01J35/51Y02E60/36
Inventor 谌春林周振强张建
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI