Mn and Co co-promoted cobaltosic oxide/silicon dioxide catalyst as well as preparation method and application thereof

A technology of cobalt tetroxide and silica, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of narrow temperature window and difficult control of working window, etc. Achieve the effect of low operating window temperature, increased activity and stability, and simple preparation method

Pending Publication Date: 2020-05-19
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the characteristics of the narrow temperature window and difficult control of the working window of most of the non-methane total hydrocarbon catalytic combustion catalysts currently used in total hydrocarbons

Method used

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  • Mn and Co co-promoted cobaltosic oxide/silicon dioxide catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A Co-promoted SiO 2 Carrier, prepared according to the following steps:

[0033] (1) According to the molar ratio n(Co):n(Si)=1:20, measure 5ml tetraethyl orthosilicate, weigh 0.24g cobalt chloride hexahydrate and dissolve in V 1 =100ml of ethanol, and ultrasonically dispersed for 30min to obtain a mixed solution;

[0034] (2) Continue to add the volume V dropwise to the above mixed solution under the condition of ultrasound 2 = 4ml of deionized water to make V 1 :V 2 =25:1, continue ultrasound for 2h;

[0035] (3) Add volume V drop by drop 3 =: 8ml ammonia water, so that the volume ratio V 2 :V 3 =1:2, continue to sonicate for 5 hours, and get precipitation;

[0036] (4) The obtained precipitate was filtered, washed with ethanol for 5 times, and then washed with deionized water for 3 times to obtain the washed precipitate;

[0037] (5) After the washed precipitate was dried at 60°C for 12h, it was calcined in air at 500°C for 3h to obtain Co-promoted SiO 2 Th...

Embodiment 2

[0039] A Co-promoted SiO 2 Carrier, other steps are the same as in Example 1, just take ethyl orthosilicate and cobalt chloride hexahydrate according to the molar ratio n(Co):n(Si)=1:25, prepare according to the following steps:

[0040] Measure 6ml of tetraethyl orthosilicate, weigh 0.24g of cobalt dichloride hexahydrate, and all the other experimental steps are the same as in Example 1 to obtain Co-promoted SiO 2 Carrier, recorded as Si25Co1 carrier.

Embodiment 3

[0042] A Co-promoted SiO 2 Carrier, other steps are the same as in Example 1, just take tetraethyl orthosilicate and cobalt chloride hexahydrate according to the molar ratio n(Co):n(Si)=1:30, prepare according to the following steps:

[0043] Measure 7ml tetraethyl orthosilicate, weigh 0.24g cobalt dichloride hexahydrate, and all the other experimental steps are the same as in Example 1 to obtain Co-promoted SiO2 The carrier is denoted as Si30Co1 carrier.

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Abstract

The invention discloses a Mn and Co co-promoted cobaltosic oxide/silicon dioxide catalyst for removing non-methane total hydrocarbon in total hydrocarbon as well as preparation and application of theMn and Co co-promoted cobaltosic oxide/silicon dioxide catalyst. The catalyst mainly comprises an active component Mn-modified Co3O4 and a Co-modified carrier SiO2, the loading capacity of the activecomponent is 20-30%, the molar ratio of Mn to Co is 1: 10 to 1: 20, and the molar ratio n (Co): n (Si) of Co to Si in the Co-modified SiO2 carrier is 1: 20 to 1: 30. The catalyst is synthesized by twosteps of a hydrolysis method and a coprecipitation method. The modified Co-promoted SiO2 carrier has stronger binding force with the active component, and Mn is introduced into Co3O4, so that the activity and stability of the catalyst are further improved. The preparation method of the catalyst is simple, the temperature of an operation window is low, and the catalyst has very high practical application value for removing non-methane total hydrocarbons in total hydrocarbons.

Description

technical field [0001] The invention belongs to the technical field of catalysis and environmental protection, and in particular relates to a cobalt trioxide / silicon dioxide catalyst co-promoted by Mn and Co, its preparation method and application. Background technique [0002] Non-methane total hydrocarbons (NMHC) refers to the general term for all other volatile hydrocarbons except methane, such as alkanes, alkenes, aromatic hydrocarbons and oxygen-containing hydrocarbon components. When the concentration of NMHC in the environment exceeds a certain level, it will cause direct harm to human health, and many volatile organic compounds have carcinogenic effects on the human body. When non-methane total hydrocarbons produce photochemical smog and ozone through chemical reaction under light conditions, it will cause immeasurable damage to the human environment. Therefore, in recent years, the state has increased the monitoring of NMHC in the environment. [0003] The current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889F23C13/08
CPCB01J23/8892F23C13/08
Inventor 崔大祥蔡婷袁静赵昆峰童琴金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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