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A kind of high temperature anti-sintering gold catalyst and its preparation method and application

A gold catalyst and precipitant technology, which is applied in the field of preparation of high-activity nano-gold catalysts, can solve the problems of catalyst deactivation, low temperature resistance of gold nano-catalysts, and reduced number of active sites, and achieves simple operation and excellent CO catalytic oxidation. Active, easy-to-control effects

Active Publication Date: 2021-04-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are still two main problems: first, the high temperature resistance of gold nanocatalysts is still low
Second, the encapsulation of the catalyst reduces the number of active sites and deactivates the catalyst.
[0004] Therefore, it is still a challenge to prepare highly stable and highly active gold nanocatalysts.

Method used

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  • A kind of high temperature anti-sintering gold catalyst and its preparation method and application
  • A kind of high temperature anti-sintering gold catalyst and its preparation method and application

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Experimental program
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Embodiment 1

[0035] Catalyst preparation process: Take the prepared chloroauric acid solution in a 250ml beaker, add a certain amount of ultrapure water, and stir on a magnetic stirrer with a rotation speed of 500rpm. Add proportionate TiO 2 (p25). The pH value is adjusted by ammonia water (analytical pure), and the pH value is adjusted by dilute ammonia water to about 7. Then the solution was heated to 70°C, a certain amount of ethyl orthosilicate was added dropwise, aged for 3 hours, washed with 2000ml of deionized water, and suction filtered. The samples were dried in an oven at 80 °C for 5 h. The catalyst was equally divided into three parts. Put them into a muffle furnace at 300°C, 500°C, and 800°C for 2 h to obtain nano-gold catalysts (Au-Ti-Si) modified by silicon oxide at different calcination temperatures, respectively marked as Au-Ti-Si Si-300, Au-Ti-Si-500, Au-Ti-Si-800. Au-Ti-Si catalysts were characterized by TEM on gold particles ( figure 1 ). It can be seen that the g...

Embodiment 2

[0037] Catalytic conversion experiment: The evaluation of CO oxidation reaction activity was carried out using a fixed-bed microreactor at atmospheric pressure. The catalyst was packed in a quartz tube in the form of powder, and the composition of the reaction raw material was CO / O 2 / N 2 =1 / 20 / 79(vol.%), the flow rate is 50ml / min, the flow rate is 20,000ml·h -1 g -1 cat . The outlet gas was analyzed online by Agilent 7890 gas chromatograph, separated by 5A molecular sieve chromatographic column, He gas was used as carrier gas, hydrogen flame ion detector (FID), and the workstation controlled the sampling process and performed data processing. The catalysts Au-Ti-Si-300, Au-Ti-Si-500, and Au-Ti-Si-800 150mg calcined at different temperatures were tested, and the catalytic results were as follows: figure 2 As mentioned above, the activity of the Au-T-Si catalyst increases with the increase of the calcination temperature. For the first time, after calcination at 800 degrees...

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Abstract

The invention provides a "one-pot method" method for preparing a highly stable and highly active loaded nano-gold catalyst. The catalyst is a gold catalyst supported by an "active oxide" carrier modified by an "inert oxide". In this method, the precursors of gold and inert oxides are uniformly deposited on the surface of the active oxide support at the same time by the deposition precipitation method (DP), and then the hydrogen oxidized by the hydrolysis of the gold and the precursors of the inert oxides is oxidized by simple calcination. The dehydration of the compound forms stable gold particles and inert oxide particles, and finally forms an anti-sintering nano-gold catalyst with ultra-high activity. This type of catalyst can stabilize the gold particles to about 6nm after being calcined under the harsh conditions of 800 degrees. At the same time, this type of catalyst exhibits very high catalytic activity in reactions such as CO oxidation, and can completely convert CO at extremely low temperatures.

Description

technical field [0001] The invention relates to a preparation method and application of a high-temperature stable high-activity nano-gold catalyst, belonging to the technical field of nano-materials. Background technique [0002] Gold nanocatalysts have unique catalytic activity in many reactions. Such as: selective oxidation, selective hydrogenation, glucose oxidation, propylene epoxidation, water gas shift reaction, catalytic combustion of volatile organic compounds (VOCs) and low temperature carbon monoxide oxidation reaction, etc. Therefore, gold nanocatalysts have attracted much attention in the field of catalysis. [0003] However, due to the low Taman temperature of gold nanoparticles, the sintering and deactivation of gold nanocatalysts under high temperature reactions seriously hinder the application of gold nanocatalysts. At present, there are many methods to inhibit the agglomeration of gold nanoparticles, such as the highly active catalyst prepared by Li Wencui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01D53/86B01D53/62
CPCB01D53/864B01J23/52Y02A50/20
Inventor 黄家辉张云来张军营洪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI