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Supported nano-gold catalyst by taking cerium oxide as carrier and preparation method thereof

A catalyst and cerium oxide technology, applied in the field of supported nano-gold catalyst and its preparation, can solve the problems of increasing the chance of gold particle aggregation, low actual loading rate, and decreased activity, and achieve fast reaction speed, low cost, and high capacity strong effect

Active Publication Date: 2012-08-22
CHINA TOBACCO FUJIAN IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The smaller the gold particles, the better the catalytic activity. When the gold loading is too high, the distance between the gold particles becomes smaller, which increases the chance of gold particle aggregation, making the gold particles larger, resulting in a decrease in activity, and high load The actual loading rate of a large amount of gold in the preparation process is not high, resulting in a waste of gold

Method used

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  • Supported nano-gold catalyst by taking cerium oxide as carrier and preparation method thereof
  • Supported nano-gold catalyst by taking cerium oxide as carrier and preparation method thereof
  • Supported nano-gold catalyst by taking cerium oxide as carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Raise cerium nitrate to 800°C at a heating rate of 5°C / min, and roast at 800°C for 5 hours to obtain light yellow CeO 2 Powder, take 0.5g of cobalt nitrate, dissolve it with 1.5ml of distilled water, then take 0.2g of citric acid and dissolve it in the cobalt nitrate solution, then pour the solution into 1g of cerium oxide powder to form a slurry, stir it evenly and then soak it for 12 hours , dried at 120°C for 12h, and calcined at 300°C for 3h to obtain a mixed oxide support.

[0020] Weigh 1g of mixed oxide carrier and add it to 50ml of distilled water, stir evenly, add dropwise 0.1ml of 20g / L chloroauric acid solution, place in a water bath and heat to 80°C, then adjust the pH value to 9 with NaOH, strongly React under stirring for 120min, pour off the solution, wash with deionized water until no detectable Cl -1 Chloride. After drying at 60°C for 16 hours, the finished catalyst 1 was obtained. The gold content of the obtained catalyst was 0.1% (mass p...

Embodiment 2～4

[0023] The preparation method is as in Example 1, except that the addition of chloroauric acid is adjusted to 0.3ml, 0.5ml, and 0.9ml respectively. The gold contents of the prepared catalysts were respectively 0.3%, 0.5%, and 0.9% (mass percentage).

[0024] The catalysts of Examples 1-4, the activity evaluation results after 0.5min of reaction are listed in Table 1.

[0025] The reaction result of table 1 embodiment 1~4

[0026]

Embodiment 5

[0028] Heat cerium nitrate to 800°C at a heating rate of 5°C / min, and roast at 800°C for 5 hours to obtain light yellow CeO 2 Powder, take 0.05g cobalt nitrate, dissolve it with 1.5ml distilled water, then take 0.2g citric acid and dissolve it in the cobalt nitrate solution, then pour the solution into 1g cerium oxide powder to form a slurry, stir it evenly, and then soak it for 12h. Dry at 120°C for 12 hours, and calcined at 300°C for 3 hours to obtain a mixed oxide carrier.

[0029] Weigh 1g of the mixed oxide carrier and add it to 50ml of distilled water, and at the same time add 0.1ml of 20g / L chloroauric acid solution dropwise, place in a water bath and heat to 80°C, then adjust the pH value to 9 with NaOH, and react for 120min under strong stirring. The solution was decanted and washed with deionized water until no detectable Cl -1 Chloride. After drying at 60°C for 16 hours, the finished catalyst 5 was obtained. The gold content of the obtained catalyst was 0.1% (mas...

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Abstract

The invention relates to a supported nano-gold catalyst by taking cerium oxide as a carrier and a preparation method thereof. The supported nano-gold catalyst comprises 0.01 to 3 mass percent of Au serving as a main active ingredient, 0.01 to 50 mass percent of Co serving as an accelerator and the balance of a carrier CeO2. The preparation method for the catalyst comprises the following steps of:preparing a mixed carrier which contains the accelerator cobalt; and supporting the active ingredient gold. An organic complexing agent is needed to participate in the preparation process and the organic complexing agent is 0.1 to 30 percent based on the mass of the catalyst. The supported nano-gold catalyst has the advantages that: when the supporting amount of the gold is 0.1 percent, 1 percentof CO can be rapidly and completely oxidized at normal temperature so as to facilitate reducing catalyst cost; and the catalyst is not needed to be roasted, so that the energy consumption is fully reduced, polluted gas is not emitted and the catalyst is environment-friendly.

Description

technical field [0001] The invention relates to a supported nano-gold catalyst and a preparation method thereof. Background technique [0002] When gold is dispersed on the carrier at the nanometer level, it exhibits catalytic activity that bulk gold does not have. Therefore, supported nano-gold catalysts have attracted widespread interest in recent decades and have been applied to many catalytic reactions. However, research The focus is still on its performance of catalytic oxidation of CO at room temperature. [0003] For supported gold catalysts, the size of gold particles, the choice of support, catalyst preparation method, heat treatment conditions, etc. will all affect the final catalytic activity. [0004] The smaller the gold particles, the better the catalytic activity. When the gold loading is too high, the distance between the gold particles becomes smaller, which increases the chance of gold particle aggregation, making the gold particles larger, resulting in a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01D53/62B01D53/86
CPCY02A50/20
Inventor 蓝洪桥李巧灵张元华范坚强连芬燕方维平杨意泉
Owner CHINA TOBACCO FUJIAN IND
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