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High-dispersion mesoporous Ag-Al catalyst as well as preparation method and application thereof

A catalyst and highly dispersed technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problem of effective contact between unfavorable reaction raw materials and catalyst active components and subsequent reactions and catalytic combustion Problems such as high device cost and affecting catalytic reaction activity have achieved broad industrial application prospects and economic benefits, broad application prospects and commercial value, and the effect of resisting poisoning

Pending Publication Date: 2019-02-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the scarcity and high price of precious metals, the cost of the entire catalytic combustion device is relatively high, which limits its popularization and application.
At the same time, common noble metal catalysts are prepared by impregnation method, which is limited by the very low loading of active components, usually no more than 0.5wt.%, resulting in 2 o 3 or SiO 2 ) The vast majority of the exposed surface is the non-catalytic reaction activity of the carrier surface, which is not conducive to the effective contact between the reaction raw material and the catalyst active component and the subsequent reaction, thus seriously affecting the catalytic reaction activity.
In addition, the VOCs emitted by refineries, oil depots, etc. usually contain a part of organic sulfides, and precious metal catalysts are very prone to sulfur poisoning and cannot exert their reactivity.

Method used

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  • High-dispersion mesoporous Ag-Al catalyst as well as preparation method and application thereof
  • High-dispersion mesoporous Ag-Al catalyst as well as preparation method and application thereof
  • High-dispersion mesoporous Ag-Al catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, an Ag-Al catalyst with a mass ratio of Ag:Ce:Al of about 10:2:88 (Ce as a promoter) was prepared.

[0038] The specific preparation method is as follows:

[0039] First, dissolve 21g of template agent P123 in a beaker filled with 400mL of 1-propanol, then add 32mL of concentrated nitric acid and 41g of aluminum isopropoxide, and continuously stir vigorously for 30 minutes;

[0040] Secondly, 6.8g of silver nitrate (AgNO 3 ) and 1.2g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) sequentially add in the above-mentioned solution and constantly stir;

[0041] Subsequently, cover the mouth of the beaker with a PET plastic film and tie it up tightly, and stir continuously for 12 hours;

[0042] Remove the PET plastic film, place the beaker in a vacuum oven, and dry at 55°C for 14 hours;

[0043] Finally, the plastic solid in the beaker was taken out, placed in a muffle furnace, and the temperature was raised to 500°C at a rate of 2°C / min and maintained for 4 hou...

Embodiment 2

[0049] In this example, an Ag-Al catalyst with a mass ratio of Ag:La:Al of about 20:5:75 (La as a promoter) was prepared.

[0050] Concrete preparation method comprises the following steps:

[0051] First, dissolve 12g of template agent P123 in a beaker filled with 400mL of methanol, then add 21mL of concentrated hydrochloric acid and 27g of aluminum isopropoxide, and continuously stir vigorously for 30 minutes;

[0052] Secondly, 5.3g of silver nitrate (AgNO 3 ) and 2.4g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) sequentially add in the above-mentioned solution and constantly stir;

[0053] Subsequently, cover the mouth of the beaker with a PET plastic film and tie it up tightly, and stir continuously for 12 hours;

[0054] Remove the PET plastic film, place the beaker in a vacuum oven, and dry at 55°C for 16 hours;

[0055] Finally, the plastic solid in the beaker was taken out, placed in a muffle furnace, and the temperature was raised to 500°C at a rate of 2°C / min and m...

Embodiment 3

[0059] In this example, an Ag-Al catalyst with a mass ratio of Ag:Al of about 25:75 (without additives) was prepared.

[0060] Concrete preparation method comprises the following steps:

[0061] First, dissolve 18g of template agent P123 in a beaker filled with 400mL of absolute ethanol, then add 28mL of concentrated nitric acid and 23g of aluminum isopropoxide, and continuously stir vigorously for 30 minutes;

[0062] Secondly, 5.6g of silver nitrate (AgNO 3 ) sequentially added in the above solution and constantly stirred;

[0063] Subsequently, cover the mouth of the beaker with a PET plastic film and tie it up tightly, and continuously stir for 16 hours;

[0064] Remove the PET plastic film, place the beaker in a vacuum drying oven, and dry at 65°C for 15 hours;

[0065] Finally, the plastic solid in the beaker was taken out, placed in a muffle furnace, and the temperature was raised to 500°C at a rate of 1.5°C / min and maintained for 5 hours, during which the air in the...

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Abstract

The invention discloses a high-dispersion mesoporous Ag-Al catalyst as well as a preparation method and application thereof, and belongs to the field of petrochemical engineering. According to the high-dispersion mesoporous Ag-Al catalyst as well as the preparation method and application thereof, the problems that the effective contact is poor in the reaction process due to the fact that an existing noble metal catalytic combustion catalyst in a VOCs catalytic combustion technology is low in loading capacity, and meanwhile, the noble metal catalyst is high in cost, not resistant to sulfur poison and the like can be solved; and silver nitrate and aluminum isopropoxide serve as raw materials, transition metal nitrate serves as an auxiliary agent, P123 serves as a template agent, hydrochloricacid, nitric acid or phosphoric acid is introduced to adjust the acidity or alkalinity, the synthesis reaction is carried out through a solvent volatilization-solute self-assembly method, and finallyroasting is carried out so as to prepare the mesoporous Ag-Al catalyst. The Ag-Al catalyst prepared through the preparation method has high reaction activity on benzene-containing waste gas, under the condition that the air speed is 35000 h<-1>, the reaction temperature is lower than 280 DEG C when the conversion rate is not lower than 99%, and the Ag-Al catalyst can be used for replacing a noblemetal catalyst to be used in a catalytic combustion process.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and relates to a volatile organic compound catalytic combustion catalyst and a preparation method thereof, in particular to a highly dispersed mesoporous Ag-Al catalyst, a preparation method and an application thereof. Background technique [0002] As my country begins to comprehensively implement the "Petroleum Refining Industry Pollutant Discharge Standard" (GB31570-2015) and "Petrochemical Industry Pollutant Discharge Standard" (GB31571-2015), volatile organic compounds (VOCs) and some characteristic pollutants emissions need to meet more stringent requirements. The above two standards require that the treatment efficiency of non-methane total hydrocarbons is ≥97%, and the emission limit of non-methane total hydrocarbons is ≤120mg / m 3 , the discharge limit of organic characteristic pollutants requires benzene ≤ 4mg / m 3 , toluene≤15mg / m 3 , Xylene≤20mg / m 3 . Traditional oil and gas rec...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J35/10F23G7/07
CPCF23G7/07B01J23/002B01J23/66B01J2523/00B01J35/633B01J35/647B01J35/615B01J2523/18B01J2523/31B01J2523/3712B01J2523/3706
Inventor 刘欢尹树孟张健中于辉刘全桢
Owner CHINA PETROLEUM & CHEM CORP