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Preparation method and application of supported catalyst based on Co3O4

A supported catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve environmental unfriendly problems, achieve the effect of increasing catalytic performance and increasing active sites

Pending Publication Date: 2022-06-07
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Discover Co. 3 o 4 The propane conversion rate of the catalyst, the minimum temperature to reach 90% is 220 o C, however, the concentration of propane to be treated is only 20 ppm, and the rest is air, so this catalyst is only suitable for catalytic combustion of low-concentration alkanes
In addition, since Cr oxides are easy to generate Cr during the reaction process 6+ , not friendly to the environment

Method used

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  • Preparation method and application of supported catalyst based on Co3O4
  • Preparation method and application of supported catalyst based on Co3O4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Co 3 O 4 / ZSM-5 catalyst preparation

[0026] According to the mass fraction of Co, it is 15 wt% of the carrier ZSM-5(18).

[0027] Weigh 0.740 g Co(NO 3 ) 2 ·6H 2 O, add 5 mL deionized water to dissolve, then add 1.000 g ZSM-5 (SiO 2 / Al 2 O 3 =18, hydrogen type) carrier. After stirring well, soak it at room temperature for 1.5 hours, then transfer it to 90 o C fry in a water bath. 120 oDry in a C oven for 12 hours, grind and place it in an air atmosphere of a muffle furnace, 500 o C was calcined for 3 hours to obtain Co 3 O 4 / ZSM-5 catalyst. The prepared catalyst was at 300 o Reduction treatment with pure hydrogen at C for 2 hours, followed by this catalyst at 0.2% C 3 H 8 + 2% O 2 +97.8%N 2 Atmosphere with a heating rate of 20 o C / min from 20 o C warmed to 480 o C, 480 o Incubate at C for 1 hour, naturally cool to room temperature and take out, which is Co. 3 O 4 / ZSM-5 catalyst.

[0028] (2) Catalyst performance test:

[0029] The c...

Embodiment 2

[0031] Co 3 O 4 / ZSM-5 catalyst was prepared, and the mass fraction of Co was 20 wt% of the carrier ZSM-5(18).

[0032] Weigh 0.986 g Co(NO 3 ) 2 ·6H 2 O, add 5 mL deionized water to dissolve, then add 1.000 g ZSM-5 (SiO 2 / Al 2 O 3 =18, hydrogen type) carrier. After stirring well, soak it at room temperature for 1.5 hours, then transfer it to 90 o C fry in a water bath. 120 o Dry in a C oven for 12 hours, grind and place it in an air atmosphere of a muffle furnace, 500 o C was calcined for 3 hours to obtain Co 3 O 4 / ZSM-5 catalyst. The prepared catalyst was at 300 o Reduction treatment with pure hydrogen at C for 2 hours, followed by this catalyst at 0.2% C 3 H 8 + 2% O 2 +97.8%N 2 Atmosphere with a heating rate of 20 o C / min from 20 o C warmed to 480 o C, 480 o Incubate at C for 1 hour, naturally cool to room temperature and take out, which is Co. 3 O 4 / ZSM-5 catalyst. The catalyst performance test is the same as that in Example 1, and the cataly...

Embodiment 3

[0034] Co 3 O 4 / ZSM-5 catalyst was prepared, and the mass fraction of Co was 25 wt% of the carrier ZSM-5(18).

[0035] Weigh 1.233 g Co(NO 3 ) 2 ·6H 2 O, add 5 mL deionized water to dissolve, then add 1.000 g ZSM-5 (SiO 2 / Al 2 O 3 =18, hydrogen type) carrier. After stirring well, soak it at room temperature for 1.5 hours, then transfer it to 90 o C fry in a water bath. 120 o Dry in a C oven for 12 hours, grind and place it in an air atmosphere of a muffle furnace, 500 o C was calcined for 3 hours to obtain Co 3 O 4 / ZSM-5 catalyst. The prepared catalyst was at 300 o Reduction treatment with pure hydrogen at C for 2 hours, followed by this catalyst at 0.2% C 3 H 8 + 2% O 2 +97.8%N 2 Atmosphere with a heating rate of 20 o C / min from 20 o C warmed to 480 o C, 480 o Incubate at C for 1 hour, naturally cool to room temperature and take out, which is Co. 3 O 4 / ZSM-5 catalyst. The catalyst performance test is the same as that in Example 1, and the cataly...

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Abstract

The invention discloses a preparation method and application of a supported catalyst based on Co3O4, and relates to the technical field of catalyst preparation. The preparation method comprises the following steps: preliminarily preparing Co3O4 / ZSM-5; then, the prepared Co3O4 / ZSM-5 is subjected to reduction treatment for 2 hours at the temperature of 300 DEG C by using pure hydrogen, so that Co3O4 in the Co3O4 / ZSM-5 is reduced into metallic state Co; the catalyst subjected to pure hydrogen reduction treatment is pre-oxidized to 480 DEG C at the temperature of 20 DEG C in the atmosphere of 0.2% of C3H8, 2% of O2 and 97.8% of N2, Co in Co3O4 / ZSM-5 is oxidized into Co3O4 again, and after the temperature is reduced to the room temperature, the supported Co3O4 / ZSM-5 catalyst is prepared. The invention also comprises application of the supported catalyst based on Co3O4. The prepared Co3O4 / ZSM-5 catalyst is firstly subjected to pure hydrogen reduction and then is subjected to re-oxidation treatment in the atmosphere of 0.2% C3H8, 2% O2 and 97.8% N2, so that the Co3O4 / ZSM-5 catalyst in which Co3O4 particles on the surface of the carrier are more uniformly dispersed can be prepared, active sites on the surface of the catalyst are greatly increased, and the catalytic performance of the Co3O4 / ZSM-5 catalyst is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, in particular to a Co-based 3 O 4 The preparation method and application of the supported catalyst. Background technique [0002] With the increasingly stringent environmental legislation, environmental pollution caused by volatile organic compounds (VOCs) emissions has attracted more and more attention, and it is urgent to develop effective technologies to control VOCs emissions. The existing ones mainly include adsorption, combustion, etc. Among them, catalytic combustion technology for VOCs treatment has the characteristics of high efficiency and low cost, and is widely regarded as one of the most promising methods for removing volatile organic compounds. Among the many volatile organics, alkanes are the most chemically stable and require higher temperatures to fully oxidize them. The large amount of propane released in the field of liquefied petroleum gas (LPG) is also in urge...

Claims

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Application Information

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IPC IPC(8): B01J29/46B01J37/02B01J37/08B01J37/18B01J37/14F23G7/07
CPCB01J29/46B01J37/0201B01J37/088B01J37/18B01J37/14F23G7/07B01J2229/186F23G2209/14Y02P20/52
Inventor 罗孟飞刘初凤陈建李蓓王旭芳
Owner ZHEJIANG NORMAL UNIVERSITY