Nanocrystalline WC-Co-Ni catalyst

A catalyst and nanocrystalline technology, applied in the field of nanocrystalline WC-Co-Ni catalysts, can solve problems that have not yet been seen in literature and application reports, and achieve the effects of wide application prospects, high catalytic performance, and simple process control

Inactive Publication Date: 2008-03-19
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nanocrystalline WC-Co-Ni catalyst proposed by the present invention and its preparation method have not yet seen literature and application reports

Method used

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  • Nanocrystalline WC-Co-Ni catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 16.25g of ammonium metatungstate, 1.63g of cobalt nitrate and 1.63g of nickel nitrate were fully mixed in distilled water to prepare a mixed aqueous solution with a mass concentration of 10%. Ultrasonic vibration was used for 30 minutes at room temperature, and then stirred by a magnetic stirrer. The solution is introduced into a spray dryer for spray drying to obtain oxide particle precursors. In the spray drying process, the inlet flow rate of the mixture aqueous solution is 20mL / min, the air inlet flow rate is 600L / h, and the inlet nozzle temperature of the hot air nozzle is 200 °C, the temperature at the outlet of the tail gas is 100 °C; put the dried precursor into a quartz boat and place it in a tube-type resistance furnace, pass hydrogen gas at 450 °C, perform 2 hours of baking heat treatment, and then raise the temperature to 750 °C , into the mixed gas of methane and hydrogen for reductive carbonization, the mass ratio of methane and hydrogen mixed is 1:8, the g...

Embodiment 2

[0037]Fully mix 20.20g ammonium paratungstate, 0.20g cobalt oxalate and 0.20g nickel chloride in distilled water to prepare a mixed aqueous solution with a mass concentration of 5%, vibrate ultrasonically for 10 minutes at room temperature, and then stir the solution with a magnetic stirrer Import into a spray dryer for spray drying to obtain oxide particle precursors. During the spray drying process, the inlet flow rate of the mixture aqueous solution is 5mL / min, the air inlet flow rate is 400L / h, and the inlet nozzle temperature of the hot air nozzle is 160°C. The temperature at the outlet of the tail gas was 80°C; the dried precursor was loaded into a quartz boat and placed in a tubular resistance furnace, and hydrogen gas was introduced at 400°C for 0.5 hours of calcination heat treatment, then the temperature was raised to 900°C, and the The mixed gas of methane and hydrogen was added for reductive carbonization, the mass ratio of methane and hydrogen mixed was 1:15, the g...

Embodiment 3

[0039] 22.10g tungsten hexacarboxylate, 0.22g cobalt acetate and 4.42g nickel acetate were fully mixed in distilled water to prepare a mixed aqueous solution with a mass concentration of 30%. Ultrasonic vibration was used at room temperature for 60 minutes, and then the mixture was stirred with a magnetic stirrer. The solution is introduced into a spray dryer for spray drying to obtain oxide particle precursors. During the spray drying process, the inlet flow rate of the mixture aqueous solution is 40mL / min, the air inlet flow rate is 800L / h, and the inlet nozzle temperature of the hot air nozzle is 250°C , the temperature at the outlet of the tail gas is 120°C; the dried precursor is loaded into a quartz boat and placed in a tubular resistance furnace, and hydrogen gas is introduced at 500°C for 1 hour of baking heat treatment, and then the temperature is raised to 600°C. The mixed gas of methane and hydrogen is introduced for reduction carbonization, the mass ratio of methane...

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Abstract

The invention discloses a nano-crystalline WC-Co-Ni catalyst, consisting of tungsten carbide, cobalt and nickel. The catalyst is prepared in the following procedures: the tungsten, the cobalt and the nickel soluble salt is mixed according to the mass ratio 100:1 to 20: 1 to 20 and is mixed in distilled water to produce mixed aqueous solution with a concentration of 5 to 30 percent; the mixed aqueous solution is introduced into a spray dryer for spray drying to yield oxide granule precursor; the oxide granule precursor is sintered, reduced and carbonized in the reaction furnace; after that the free carbon is removed in hydrogen atmosphere; and at last the product is cooled to room temperature under the protection of inert gas to yield nano-crystalline WC-Co-Ni catalyst. The process and the devices are simple, the cost is low and the nano-crystalline WC-Co-Ni catalyst yielded has high catalytic performance. Used as electrochemical hydrogen evolution and fuel cell, the electrocatalyst has wide practical prospects.

Description

(1) Technical field [0001] The invention relates to a nanocrystalline WC-Co-Ni catalyst. (2) Technical background [0002] Tungsten carbide (WC) and its composite materials have been widely used in the field of cemented carbide, because Co has good wettability and adhesion to the hard phase WC, and the dissolution of C and W in Co makes WC- Co-based cemented carbide has high hardness, high strength and high wear resistance, so from the perspective of cemented carbide production and use, Co is undoubtedly the best binder for WC-based cemented carbide. However, Co, as an expensive and scarce metal, has extremely limited global reserves, and its price is increasing year by year. The most common Co substitutes are Ni and Fe or alloys of these metals with Co. Ni, Fe and Co belong to the iron group metals in the periodic table of elements, and their density, melting point, atomic radius, and physical and chemical properties are similar, and they can wet the WC hard phase well. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J23/888
CPCY02E60/50
Inventor 马淳安盛江峰张诚
Owner ZHEJIANG UNIV OF TECH
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