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Gold catalyst used for low-temperature catalytic oxidation of carbon monoxide and preparation method thereof

A gold catalyst, low-temperature catalysis technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. It can achieve the effect of good service life, high low temperature activity and good reproducibility.

Inactive Publication Date: 2015-08-26
中国人民解放军防化学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, nano-Au catalysts are easily deactivated during storage, which is the most important factor hindering the popularization and application of Au catalysts.

Method used

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  • Gold catalyst used for low-temperature catalytic oxidation of carbon monoxide and preparation method thereof
  • Gold catalyst used for low-temperature catalytic oxidation of carbon monoxide and preparation method thereof
  • Gold catalyst used for low-temperature catalytic oxidation of carbon monoxide and preparation method thereof

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preparation example Construction

[0019] The preparation method of the above-mentioned gold catalyst for the low-temperature catalytic oxidation of carbon monoxide comprises the following steps:

[0020] (1) the first component is lactulose oligosaccharide or glucose, the second component is cerium nitrate and transition metal salt and the third component acrylamide or crotonamide are dissolved in water to obtain a mixed solution, and in the mixed solution, The molar concentration of the first component is 0.13mol / L, the molar concentration of the second component is 0.06mol / L, and the molar concentration of the third component is 0.06mol / L; In the described second component, cerium nitrate and The molar ratio of the transition metal salt is 1:0~0.11, wherein the transition metal salt is any one of lanthanum nitrate, yttrium nitrate, zirconium sulfate or tin sulfate;

[0021] (2) Adjust the pH value of the above-mentioned mixed solution to 8-12 with ammonia water or urea to obtain a colloid, stir for 3-7 hours...

Embodiment 1

[0026] Glucose, cerium nitrate and acrylamide with molar concentrations (mol / L) of 0.13, 0.06 and 0.06 were dissolved in water to obtain a mixed solution, and the pH value of the mixed solution was adjusted to 10 with ammonia water to obtain a colloid, which was stirred for 4 hours, and then dissolved at 180 Keep at ℃ for 100 hours to obtain the reactant, filter the reactant to obtain a precipitate, wash the precipitate with water 8 times, wash with absolute ethanol 5 times, dry at 80°C for 20 hours, then calcinate at 550°C for 6 hours, Flower-like cerium oxide support CeO 2 . Dissolve chloroauric acid in deionized water to make a solution with a concentration of 0.0056mol / L, and the flower-shaped CeO 2 Add 100ml of deionized water to obtain a suspension with a mass percentage of 1% of the carrier, then add 16ml of chloroauric acid solution dropwise and stir for 2 hours, then use 0.5mol / L K 2 CO 3After adjusting the pH of the mixed solution to 9, react at 100°C for 24 hours...

Embodiment 2

[0028] The molar concentration (mol / L) is respectively 0.13, 0.06 and 0.06 lactulose-oligosaccharide, cerium nitrate and crotonamide to be dissolved in water and obtain mixed solution, adjust the pH value of mixed solution to 8 with ammonia water, obtain colloid, stir 3 Hours, kept at 160°C for 100 hours to obtain the reactant, filtered the reactant to obtain a precipitate, washed the precipitate 8 times with water, washed 5 times with absolute ethanol, dried at 120°C for 10 hours, and then dried at 450°C Calcined at lower temperature for 6 hours to obtain a spherical cerium oxide carrier. Dissolve chloroauric acid in deionized water to make a solution with a concentration of 0.0056mol / L, and the flower-like CeO 2 Add 100ml of deionized water to obtain a suspension with a mass percentage of 1.5% of the carrier, then add 16ml of chloroauric acid solution dropwise and stir for 2h, and use 0.5mol / LK 2 CO 3 After adjusting the pH of the mixed solution to 8, react at 80°C for 30 ...

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Abstract

The invention relates to a gold catalyst used for low-temperature catalytic oxidation of carbon monoxide and a preparation method thereof, belonging to the technical field of environmental protection. The gold catalyst is composed of a carrier and active ingredients, wherein the carrier is flower-ball-shaped cerium oxide, and the active ingredients are gold nanoparticles which are attached on the petals gaps of the carrier. The method comprises the following steps: firstly using lactosucrose or / and cerium nitrate and transition metal salt as raw materials so as to prepare a ball-shaped cerium oxide carrier; and using chloroauric acid, ball-shaped cerium oxide and the like as the raw materials so as to prepare the gold catalyst used for the low-temperature catalytic oxidation of carbon monoxide. The method in the invention uses the carrier with a single component, and has simple process of preparation process and good reproducibility; meanwhile, the prepared gold catalyst has high low-temperature activity and good stability, can be widely used in the fields of respirators, CO2 lasers, CO sensors, underground tunnels, submarines, spacecrafts, etc., and is a highly-effective catalyst for the catalytic oxidation of CO in a closed space.

Description

technical field [0001] The invention relates to a gold catalyst for low-temperature catalytic oxidation of carbon monoxide and a preparation method thereof, belonging to the technical field of environmental protection. Background technique [0002] CO is a colorless, odorless, flammable and explosive poisonous and harmful gas, ranking first among air pollutants. According to statistics, the world emits hundreds of millions of tons of CO into the air every year, mainly from the combustion of fossil fuels, industrial waste gas and vehicle exhaust emissions, and more than half of them come from automobile exhaust. Humans and animals will experience dizziness, headache and other side effects when exposed to air with a CO concentration of 25ppm for more than 8 hours. When the CO concentration reaches 650-700ppm, it may even cause suffocation and death. Therefore, the elimination of CO has been a general concern. Among many physical and chemical elimination methods, catalytic ox...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01D53/86B01D53/62
CPCY02A50/20
Inventor 孙杰张静静李吉刚朱月峰
Owner 中国人民解放军防化学院
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