Au/M1-M2-Ox/Al2O3 nano-gold catalyst for catalyzing oxidation of CO in CO2-rich atmosphere

A catalyst, nano-gold technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst activation/preparation, etc., can solve the problem of reducing the activity and stability of gold catalyst, carbonate species Accumulation, decreased reactivity and other problems, to achieve the effect of improving catalytic activity and reaction stability, reducing strong basic sites, and improving catalytic reactivity

Pending Publication Date: 2020-09-04
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that one of the reasons is due to CO 2 Carbonate species are generated on the surface of the catalyst, and the carbonate species continue to accumulate and overlap with the Au active sites on the catalyst surface, thereby hindering the progress of the reaction and causing a rapid decline in the reaction activity.
in rich CO 2 CO oxidation reaction under atmosphere, such as CO-PROX (about 20vol.%), CO 2 Lasers (about 60 vol.%) are more likely to cause accumulation of carbonate species, which greatly reduces the activity and stability of gold catalysts

Method used

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  • Au/M1-M2-Ox/Al2O3 nano-gold catalyst for catalyzing oxidation of CO in CO2-rich atmosphere
  • Au/M1-M2-Ox/Al2O3 nano-gold catalyst for catalyzing oxidation of CO in CO2-rich atmosphere
  • Au/M1-M2-Ox/Al2O3 nano-gold catalyst for catalyzing oxidation of CO in CO2-rich atmosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1%Au / 8wt.% / Fe-Ce-O x / Al 2 o 3 Preparation of:

[0029] 0.20ml of Ce(NO 3 ) 2 solution (0.601mol / L) and 0.19 ml of Fe(NO 3 ) 3 The solution was mixed and diluted to 1.5 ml with deionized water; 0.92 g γ-Al 2 o 3 Mix well with the solution and age for several hours; dry the sample at 120°C for 2h, then dry it at 650 o Calcined at C for 4 hours, the obtained composite support is Fe-Ce-O x / Al 2 o 3 , into powder. 0.516 gHAuCl 4 Solution (19.12 g Au / L) is placed in a beaker, and its pH value is adjusted to 9 by adding ammonia water dropwise; the Fe-Ce-O x / Al 2 o 3 The carrier was added to the solution and stirred for several hours; the sample was rinsed with deionized water to remove residual chloride ions, and dried in air at 70 °C for several hours, and the obtained sample was Au / Fe-Ce-O x / Al 2 o 3 . Among them, the TEM photos and the particle size distribution of Au nanoparticles are as follows figure 1 as shown, figure 1 The Au nanoparticles sh...

Embodiment 2

[0041] 1%Au / 7wt.% / Fe-Mn-O x / Al 2 o 3 Preparation of:

[0042] Weigh 0.93 g Al 2 o 3 Dissolve the powder in 30 mL of ionized water and mix well, add 0.50 mL of Fe(NO 3 ) 3 solution (0.612 mol / L) and 0.27 mL Mn(NO 3 ) 2 solution (1.4059 mol / L) and fully mixed; filter the suspension under reduced pressure, and place the filter cake in an oven for 120 o C drying for 2 h, and at 650 oC Calcined for 4 h and ground to obtain Fe-Mn-O x / Al 2 o 3 Composite carrier. 0.516 g HAuCl 4 Solution (19.12 g Au / L.) is placed in a beaker, and its pH value is adjusted to 9 by adding ammonia water dropwise; the Fe-Mn-O x / Al 2 o 3 The carrier was added to the solution and stirred for several hours; the sample was rinsed with deionized water to remove residual chloride ions, and dried in air at 70 °C for several hours, and the obtained sample was expressed as Au / Fe-Mn-O x / Al 2 o 3 . After the sample was reacted for 1000 minutes, the raw gas composition was: 60 vol.% CO 2 +1...

Embodiment 3

[0044] 1%Au / 5wt.% / Ni-Nb-O x / Al 2 o 3 Preparation of:

[0045] 0.44ml of Ni(NO 3 ) 2 solution (0.701mol / L) and 0.19 ml of Nb(NO 3 ) 3 solution (1.05mol / L) was mixed and diluted to 1.5ml with deionized water; 0.95g γ-Al 2 o 3 Mix well with the solution and age for several hours; dry the sample at 100°C for 4 hours, then dry it at 650 o Calcined at C for 4 hours, the obtained composite support is Ni-Nb-O x / Al 2 o 3 , into powder. 0.516 g HAuCl 4 Solution (19.12 g Au / L.) is placed in a beaker, and the pH value is adjusted to 10 by adding ammonia water dropwise; the Ni-Nb-O x / Al 2 o 3 The carrier was added to the solution and stirred for several hours; the sample was rinsed with deionized water to remove residual chloride ions, and dried overnight in air at 60 °C, and the obtained sample was expressed as Au / Ni-Nb-O x / Al 2 o 3 . After the sample reacted for 1200 minutes, the raw gas composition was: 60 vol.% CO 2 +1 vol.% CO+0.5 vol.% O 2 , balanced N 2 ...

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Abstract

The invention relates to an Au / M1-M2-Ox / Al2O3 nano-gold catalyst for catalyzing oxidation of CO in a CO2-rich atmosphere and a preparation method of the Au / M1-M2-Ox / Al2O3 nano-gold catalyst. Accordingto the preparation method disclosed by the invention, an Al2O3 carrier is modified by a method of adding M1Ox and M2Ox, and the prepared M1-M2-Ox / Al2O3 carrier has fewer strong base sites and is richin active oxygen species, so the Au / M1-M2-Ox / Al2O3 catalyst is prepared. Testing is conducted in an atmosphere of CO2 with a concentration of 60 vol.% to evaluate the activity and stability of the catalyst. Experimental results show that the catalyst provided by the invention has high CO catalytic oxidation activity in the CO2-rich atmosphere, has excellent CO2 accumulation resistance and excellent reaction stability, and has good application potential in CO2-rich scenes such as CO2 lasers.

Description

technical field [0001] The present invention relates to a kind of 2 Highly dispersed and highly stable Au / M used under atmosphere 1 -M 2 -O x / Al 2 o 3 Nano gold catalyst and its application. Specifically by adding M 1 o x , M 2 o x A series of metal oxide composite supports with fewer strong base sites and rich in active oxygen species were prepared by the method of inert support modification, and the new catalyst was rich in CO 2 application in atmosphere. Background technique [0002] The supported nano-gold catalyst has good catalytic performance for the CO oxidation reaction, and can oxidize CO to CO at low temperature. 2 , but the catalyst is easily deactivated during the reaction. Studies have shown that one of the reasons is due to CO 2 Carbonate species were generated on the catalyst surface, and the carbonate species continued to accumulate and overlap with the Au active sites on the catalyst surface, which hindered the reaction and led to a rapid decl...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J37/03C01B32/50
CPCB01J23/894B01J23/8986B01J23/898B01J23/8993B01J23/002B01J37/031C01B32/50B01J2523/00B01J35/40B01J2523/19B01J2523/31B01J2523/3712B01J2523/842B01J2523/72B01J2523/56B01J2523/847B01J2523/67
Inventor 林清泉苗仲杨房强齐世学邹旭华覃瑜陈婷婷
Owner YANTAI UNIV
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