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A kind of ultrasonic-assisted method for preparing nickel-cerium solid solution material

An ultrasonic-assisted, solid solution technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems of low doping efficiency, affecting the overall performance of the catalyst, and uneven distribution of crystal phases, achieving high doping efficiency, Uniform crystal phase and low manufacturing cost

Active Publication Date: 2019-04-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation of nano-cerium-based solid solution materials has greatly improved the performance of cerium oxide-based catalysts, but the above-mentioned methods are prone to uneven crystal phase distribution during the preparation process, resulting in low doping efficiency and affecting the overall performance of the catalyst. performance

Method used

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  • A kind of ultrasonic-assisted method for preparing nickel-cerium solid solution material
  • A kind of ultrasonic-assisted method for preparing nickel-cerium solid solution material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 0.181g cerium chloride heptahydrate and 0.029g nickel chloride hexahydrate (4:1 molar ratio) into a beaker containing 40ml dimethyl sulfoxide, and add 1.0ml formic acid, stir for 30min, put the beaker 1.0 g of polyvinylpyrrolidone (molecular weight: 10,000) was slowly added into the ultrasonic cleaning machine with a frequency of 40 kHz, and the ultrasonic temperature was set to 30°C, and the ultrasonic treatment was started for 0.5 h. Add 4ml of dilute ammonia water with a concentration of 1.5wt% and stir evenly, then transfer the solution to a hydrothermal kettle equipped with a polytetrafluoroethylene liner for high-temperature treatment at a temperature of 120°C and a treatment time of 0.5h. After the high-temperature treatment, filter the solution, wash the solid three times with distilled water and absolute ethanol, and then dry it at 80°C for 6-8h, then roast the solid at 400°C in an air atmosphere for 5h, with a heating rate of 2°C / min . Gained solid is soa...

Embodiment 2

[0023] Add 2.321g of cerium nitrate hexahydrate and 0.016g of nickel nitrate hexahydrate (99:1 molar ratio) into a beaker containing 100ml of dimethyl sulfoxide, and add 3.0ml of glycolic acid. After stirring for 30min, put the beaker into At the same time, slowly add 4.0 g of hexadecyl ammonium bromide to an ultrasonic cleaning machine with a frequency of 40 kHz, set the ultrasonic temperature to 60° C., and start ultrasonic treatment for 4 hours. Add 8ml of dilute ammonia water with a concentration of 3wt% and stir evenly, then transfer the solution to a hydrothermal kettle equipped with a polytetrafluoroethylene liner for high-temperature treatment at a temperature of 180°C and a treatment time of 72 hours. After the high-temperature treatment, filter the solution, wash the solid three times with distilled water and absolute ethanol, and then dry it at 80°C for 6-8h, then roast the solid at 600°C in an air atmosphere for 3h, with a heating rate of 3°C / min . Gained solid is...

Embodiment 3

[0025] Add 0.181g of cerium chloride heptahydrate and 0.013g of nickel chloride hexahydrate (9:1 molar ratio) into a beaker containing 34ml of dimethyl sulfoxide, and add 1.0ml of formic acid. After stirring for 30min, put the beaker 1.0 g of polyvinylpyrrolidone (molecular weight: 30,000) was slowly added into the ultrasonic cleaning machine with a frequency of 40 kHz, and the ultrasonic temperature was set to 30°C, and the ultrasonic treatment was started for 1 hour. Add 2ml of dilute ammonia water with a concentration of 2wt% and stir evenly, then transfer the solution to a hydrothermal kettle equipped with a polytetrafluoroethylene liner for high-temperature treatment at a temperature of 160°C for 4 hours. After the high-temperature treatment, filter the solution, wash the solid three times with distilled water and absolute ethanol, and then dry it at 80°C for 6-8h, then roast the solid at 450°C in an air atmosphere for 4h, with a heating rate of 2°C / min . Gained solid is...

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Abstract

The invention belongs to the technical field of solid material preparation, and particularly relates to a method for preparing a nickel-cerium solid solution material through ultrasonic assistance. The method comprises the steps that nickel salt, cerium salt, organic acid and an organic macromolecular structure guide agent sufficiently interact through the ultrasonic assistance in a solvent heat treatment manner; and under a self-assembly effect, a flower-shaped or spherical nickel-cerium solid solution with a uniform crystalline phase is formed. The nickel-cerium solid solution material prepared by the method is lower in nickel content, has the characteristics of high specific surface area, high nickel atom dispersity, small crystal particle size, uniform crystalline phase and the like, has excellent oxidoreduction performance and oxygen storage and release performance, has the oxygen storage quantity of 400-600 [mu]mol O / g, and has good application prospects in the fields of environment catalysis, solid fuel batteries, sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of solid material preparation, and in particular relates to a method for preparing a nickel-cerium solid solution material. Background technique [0002] As a typical rare earth oxide, cerium oxide has both +3 and +4 valence cerium ions in its fluorite crystal structure, which makes it have excellent redox performance and oxygen storage and release performance. Therefore, cerium oxide-based Cerium-based composite metal materials are widely used in the fields of environmental catalysis and energy catalysis, such as catalytic oxidation of automobile exhaust, catalytic oxidation of volatile organic compounds (VOCs), steam reforming, etc. Among them, the cerium-based solid solution materials formed by doping metal ions into the ceria lattice have attracted extensive attention due to their higher oxygen vacancy content, faster ion migration rate, and higher catalytic reactivity. [0003] It is found that the pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00
CPCC01G53/00C01P2004/03C01P2004/80C01P2006/12
Inventor 徐华龙黄镇沈伟车仁超李青青
Owner FUDAN UNIV
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