Catalyst for removing H2S from gas by catalytic oxidation, preparation method and application

A catalytic oxidation and catalyst technology, which is applied in the catalytic conversion of impurities, gas purification, etc., can solve the problem of low sulfur capacity, achieve the effects of improving desulfurization activity and selectivity, realizing recycling, and increasing the penetration of sulfur capacity

Inactive Publication Date: 2012-06-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, Oak Ridge National Laboratory in the United States has conducted research on activated carbon for fuel gas desulfurization, showing that activated carbon can selectively catalyze the oxidation of hydrogen sulfide to elemental sulfur, but the sulfur capacity is relatively low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mn(NO 3 ) 2 Solution, uniformly impregnated an equal volume on 30-60 mesh 5g activated carbon, placed at room temperature for 6h, dried at 60°C for 10h, dried at 100°C for 10h, and then calcined at 400°C for 4h in a nitrogen atmosphere to obtain 1% Mn / AC catalyst. The catalyst is loaded into a fixed bed reactor, the reaction temperature is controlled at 180°C, and the space velocity is 3000h -1 , H in raw gas 2 S content 3000ppm, pass O 2 / H 2 O with an S ratio of 1:1 2 , balance gas N 2 , its breakthrough sulfur capacity is 14.2%, and its desulfurization efficiency is 99.2%.

Embodiment 2

[0020] Fe(NO 3 ) 3 Solution, uniformly impregnated an equal volume on 5g activated carbon of 30-60 mesh, placed at room temperature for 3h, dried at 60°C for 8h, dried at 100°C for 10h, and then calcined at 300°C for 3h in a nitrogen atmosphere to obtain Fe / AC with a mass percentage of 0.1%. catalyst. The catalyst is loaded into a fixed bed reactor, the reaction temperature is controlled at 150°C, and the space velocity is 8000h -1 , H in raw gas 2 S content 2500ppm, pass O 2 / H 2 O with an S ratio of 1:2 2 , CO30%, H 2 40%, CO 2 21%, CH 4 1.7%, balance gas N 2 . Its breakthrough sulfur capacity is 5.82%, and its desulfurization efficiency is 99.2%.

Embodiment 3

[0022] A vanadium concentration of 0.0747g / ml NH 4 VO 3 An equal volume of oxalic acid solution was uniformly impregnated onto 5g activated carbon of 30-60 mesh, placed at room temperature for 3 hours, dried at 50°C for 4 hours, dried at 100°C for 8 hours, and then calcined at 450°C for 3 hours in a nitrogen atmosphere to obtain V / AC catalyst. The catalyst is loaded into a fixed bed reactor, the reaction temperature is controlled at 250°C, and the space velocity is 8000h -1 , H in raw gas 2 S content 2500ppm, pass O 2 / H 2 O with an S ratio of 1:2 2 , CO30%, H 2 40%, CO 2 21%, CH 4 1.7%, balance gas N 2 . Its breakthrough sulfur capacity is 3.82%, and its desulfurization efficiency is 96.5%.

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Abstract

A catalyst for removing H2S from gas by catalytic oxidation contains a metal oxide as active component, and active carbon as carrier, wherein the weight percentages of the two components are as follows: active carbon 95.0% to 99.9%, and metal oxide 0.1% to 5%; active carbon has a specific surface area of 850 to 900 m<2> / g, total pore volume of 0.45 cm<3> / g, and micro-pore volume of 0.154 cm<3> / g; and the metal oxide is oxide of Fe, V, Mn, Cu, Ce or Co. The catalyst provided by the invention has a simple preparation method, and can remarkably improve the desulfurization activity and selectivity of active carbon and greatly improve breakthrough sulfur capacity of desulfurizer.

Description

technical field [0001] The invention belongs to a catalyst, a preparation method and an application, in particular to a catalyst for removing H2S in coal gas by catalytic oxidation, a preparation method and an application. Background technique [0002] Clean coal technology based on coal gasification is one of the main ways to realize efficient and environmentally friendly utilization of coal. Sulfide is one of the main pollutants in gas, which will cause equipment corrosion, catalyst poisoning and environmental pollution. Therefore, it is a key issue in clean coal technology to achieve economical and efficient removal of sulfide in gas. At present, large-scale industrial desulfurization mostly adopts the low-temperature methanol method, but this process is a foreign patented technology, and due to the low operating temperature, it causes problems such as high investment and high energy consumption, especially when it is used in a coal gasification polygeneration system, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J23/745B01J23/22B01J23/10B01J23/72B01J23/75C10K1/34
Inventor 赵建涛方惠斌房倚天张颌董立波
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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