A kind of highly dispersed cobalt-iron bimetallic catalyst and its preparation method and application

A bimetallic catalyst and high-dispersion cobalt technology, applied in catalyst activation/preparation, molecular sieve catalysts, separation methods, etc., can solve the problems of low catalytic activity and limitation of catalyst dispersion degree, and achieve high catalytic activity and active site distribution Uniform, good dispersion effect

Active Publication Date: 2022-07-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to overcome the limitation of catalyst dispersion degree of existing persulfate catalytic activation, the defect and deficiency of catalytic activity are not high, provide a kind of preparation method of highly dispersed cobalt-iron bimetallic catalyst, prepare with uncalcined SBA-15 is used as a carrier to support cobalt-iron bimetallic, which avoids the aggregation of transition metal oxides. The transition metal atoms are highly dispersed on SBA-15, which is beneficial to expose more active sites and improve the overall catalytic activity.

Method used

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  • A kind of highly dispersed cobalt-iron bimetallic catalyst and its preparation method and application
  • A kind of highly dispersed cobalt-iron bimetallic catalyst and its preparation method and application
  • A kind of highly dispersed cobalt-iron bimetallic catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A preparation method of a highly dispersed cobalt-iron bimetallic catalyst, comprising the following steps:

[0052] S1. Weigh 1g of the prepared SBA-15 carrier in an agate mortar, add a precursor salt and grind for 30min, the precursor salt is 0.3152g Co(NO 3 ) 2 ·6H 2 O and 0.4618g Fe(NO 3 ) 3 ·9H 2 A mixture of O, the mass ratio of cobalt atoms and iron atoms is 1:1;

[0053] S2. the grinding product of S1 is treated at a constant temperature to obtain a powdered high-dispersion cobalt-iron bimetallic catalyst,

[0054] Among them, the precursor salt in S1 is Co(NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O,

[0055] The temperature of constant temperature treatment in S2 is 500°C, the heating rate is 2°C / min, and the treatment time is 5h.

[0056] Wherein, the preparation method of uncalcined carrier SBA-15 is as follows:

[0057] S11. Prepare 1.6M hydrochloric acid solution, stir and dissolve 2g of P123 surfactant in 80mL of 1.6M hydrochloric acid solutio...

Embodiment 2

[0062] A preparation method of a highly dispersed cobalt-iron bimetallic catalyst, comprising the following steps:

[0063] S1. Weigh 1g of the prepared SBA-15 carrier in an agate mortar, add a precursor salt and grind for 30min, the precursor salt is 0.1497g Co(NO 3 ) 2 ·6H 2 O and 0.4618g Fe(NO 3 ) 3 ·9H 2 A mixture of O, the mass ratio of cobalt atoms and iron atoms is 1:2;

[0064] S2. the grinding product of S1 is treated at a constant temperature to obtain a powdered high-dispersion cobalt-iron bimetallic catalyst,

[0065] Among them, the precursor salt in S1 is Co(NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O,

[0066] The temperature of constant temperature treatment in S2 is 500°C, the heating rate is 2°C / min, and the treatment time is 5h.

[0067] Wherein, the preparation method of uncalcined carrier SBA-15 is as follows:

[0068] S11. Prepare 1.6M hydrochloric acid solution, stir and dissolve 2g of P123 surfactant in 80mL of 1.6M hydrochloric acid solutio...

Embodiment 3

[0072] A preparation method of a highly dispersed cobalt-iron bimetallic catalyst, comprising the following steps:

[0073] S1. Weigh 1g of the prepared SBA-15 carrier in an agate mortar, add a precursor salt and grind for 30min, the precursor salt is 0.0499g Co(NO 3 ) 2 ·6H 2 O and 0.4618g Fe(NO 3 ) 3 ·9H 2 A mixture of O, the mass ratio of cobalt atoms and iron atoms is 1:6;

[0074] S2. the grinding product of S1 is treated at a constant temperature to obtain a powdered high-dispersion cobalt-iron bimetallic catalyst,

[0075] Among them, the precursor salt in S1 is Co(NO 3 ) 2 ·6H 2 O and Fe (NO 3 ) 3 ·9H 2 O,

[0076] The temperature of constant temperature treatment in S2 is 500°C, the heating rate is 2°C / min, and the treatment time is 5h.

[0077] Wherein, the preparation method of uncalcined carrier SBA-15 is as follows:

[0078] S11. Prepare 1.6M hydrochloric acid solution, stir and dissolve 2g of P123 surfactant in 80mL of 1.6M hydrochloric acid solutio...

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Abstract

The invention provides a highly dispersed cobalt-iron bimetallic catalyst, a preparation method and application thereof, and relates to the technical field of catalytic materials. The preparation method of the highly dispersed cobalt-iron bimetallic catalyst uses uncalcined SBA-15 as the carrier. The uncalcined SBA-15 carrier does not remove the template agent, and forms a confined space inside the carrier, which is subsequently ground and mixed with the precursor. During the loading process, the transition metal atoms grow in a confined space, thus avoiding the aggregation of permetal oxides, resulting in smaller nanoparticle size and good dispersion, using the confinement effect of SBA-15 and The highly dispersed cobalt-iron bimetallic catalyst synthesized with abundant Si-OH functional groups on the surface has uniform active site distribution and maximum exposure. The highly dispersed cobalt-iron bimetallic catalyst-persulfate catalyst system based on SBA-15 can It is used for deep purification of VOCs waste gas.

Description

technical field [0001] The invention relates to the technical field of catalytic materials, and more particularly, to a highly dispersed cobalt-iron bimetallic catalyst and a preparation method and application thereof. Background technique [0002] VOCs are atmospheric PM2.5 and O 3 The key precursors formed are easily coupled with other atmospheric pollutants, forming secondary pollutants that are difficult to decompose naturally and endanger more lasting. There are many industrial sources and complex characteristics of VOCs waste gas. At present, there is a lack of economical and long-term in-depth treatment measures. Gas-solid photocatalytic oxidation at room temperature may easily lead to catalyst deactivation due to insufficient amount of active oxygen and oxidative capacity, and the purification efficiency and mineralization degree of VOCs are limited, which is prone to secondary pollution. The traditional liquid phase absorption method uses devices such as spray tow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/03B01J35/10B01D53/86B01D53/72B01D53/44B01D53/70B01D53/79
CPCB01J29/0333B01J35/0066B01J37/0036B01J35/0013B01D53/8668B01D53/8687B01D53/8662B01D53/79B01J2229/186B01D2251/106B01D2257/2064B01D2257/7027B01D2257/708B01D2258/06Y02A50/20
Inventor 黄海保谢晓纹索梓依
Owner SUN YAT SEN UNIV
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