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Method for preparing rare-earth element doped composite metal oxide mercury removal catalyst

A rare earth element and composite metal technology, which is applied in the field of preparation of rare earth element-doped composite metal oxide mercury removal catalyst, can solve the problems of poor sulfur resistance, high energy consumption, great influence on adsorption and catalytic performance, and achieve good Adsorption capacity, simple application process, convenient operation and maintenance

Inactive Publication Date: 2009-12-16
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent No. 200410073483.4 uses this as an adsorbent to remove mercury, but it is discarded after adsorption and cannot be reused
There is also a method to put the adsorbent in the flue gas in the form of a fixed bed, but the adsorption capacity of the mercury removal material is limited, and it needs to be regenerated regularly after the adsorption is saturated.
Chinese Patent No. ZL200510029080.4 describes a heating method to regenerate catalysts or adsorbents. The method of regeneration using high-temperature airflow consumes a lot of energy and cannot achieve continuous regeneration in situ
Studies have found that sulfur dioxide in flue gas has a great influence on the adsorption and catalytic performance of general transition metal catalysts, making it difficult to perform efficient adsorption or catalytic functions
[0008] In addition, the mercury removal materials mentioned above are mostly single-component transition metal oxides, and the sulfur dioxide resistance of the materials is not considered. Through investigation, it is found that the sulfur resistance of such mercury removal materials is generally poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using 5g concentration of 50% manganese nitrate (Mn(NO 3 ) 2 ) solution, 2.82g ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O), 0.6g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O) As a precursor, add deionized water to dilute to 20mL to form an impregnation liquid, and the molar ratio of the three components is 1:0.5:0.1. Set the specific surface area to 300m 2 / g, spherical activated alumina (γ-Al 2 o 3 ) immersed in the impregnation solution for 2 hours, taken out and dried at 50°C for 12 hours, transferred to a muffle furnace for 2 hours at 300°C, and then 400°C for 2 hours and cooled naturally to room temperature to prepare the rare earth element composite metal oxide mercury removal catalyst Mn -Fe-Ce / γ-Al 2 o 3 , wherein the mass fraction of manganese is 5%.

[0026] Take 2g of the mercury-removing material and place it in a fixed reaction bed with a feed temperature of 150°C and a mercury concentration of 100μg / m 3 , Mercury-containing flue gas with HCl concen...

Embodiment 2

[0033] Adopt 3.8g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) solution, 1.4g zirconium nitrate pentahydrate (Zr(NO 3 ) 4 ·5H 2 O), 0.3g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O) As a precursor, add deionized water and dilute to 20mL to make them into impregnation liquid, wherein the molar ratio of the three components is 1:0.25:0.05; the specific surface area is 300m 2 / g, spherical activated alumina (γ-Al 2 o 3 ) was immersed in the impregnation solution for 2 hours, taken out, dried at 50°C for 12 hours, roasted in a muffle furnace at 300°C for 2 hours, roasted at 400°C for 2 hours and cooled to room temperature naturally to obtain a rare earth element composite metal oxide mercury removal catalyst Co -Zr-La / γ-Al 2 o 3 , wherein the mass fraction of cobalt is 5%.

[0034] Take 2g of the mercury-removing material and place it in a fixed reaction bed with a feed temperature of 300°C and a mercury concentration of 100μg / m 3 , Mercury-containing flue gas with HCl...

Embodiment 3

[0036] Adopt 3.8g cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) solution, 2.4g copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 O), 0.38g yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) As a precursor, add deionized water and dilute to 20mL to make them into impregnation liquid, wherein the molar ratio of the three components is 1:0.75:0.075; the specific surface area is 300m 2 / g, spherical activated alumina (γ-Al 2 o 3 ) was immersed in the impregnation solution for 2 hours, taken out, dried at 50°C for 12 hours, roasted in a muffle furnace at 300°C for 2 hours, roasted at 400°C for 2 hours and cooled to room temperature naturally to obtain a rare earth element composite metal oxide mercury removal catalyst Co -Cu-Y / γ-Al 2 o 3 , wherein the mass fraction of cobalt is 5%.

[0037] Take 2g of the mercury-removing material and place it in a fixed reaction bed with a feed temperature of 400°C and a mercury concentration of 100μg / m 3 , Mercury-containing flue gas with HCl concen...

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PUM

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Abstract

The invention relates to a method for preparing rare-earth element doped composite metal oxide mercury removal catalyst in the technical field of chemical engineering and environmental protection. The method prepares a mercury removal catalyst by rare-earth element doped composite metal oxide to realize double functions of zero-valent mercury adsorption trapping and catalytic oxidation, which not only can be sprayed into smoke gas in a powder mode to trap the zero-valent mercury onto the mercury removal material, but also can be embedded with smoke gas in a static bed mode to cooperate with oxidant to catalytically oxidize the zero-valent mercury into divalent mercury, and can be absorbed by downstream desulfurization equipment. The mercury removal material prepared by the method has better adsorption capability, catalytic function and sulfur resistance on the zero-valent mercury, and has simple application process, convenient operation and maintenance.

Description

technical field [0001] The invention relates to a preparation method of a catalyst in the technical field of chemical engineering and environmental protection, in particular to a preparation method of a rare earth element-doped composite metal oxide mercury removal catalyst. Background technique [0002] Coal burning is one of the main causes of atmospheric mercury pollution, following SO 2 After NOx and NOx, mercury has gradually become a priority air pollutant to be controlled. The United States has officially promulgated relevant control regulations and invested a lot of money in related research. Canada and other countries are also stepping up the formulation of corresponding measures. Due to the large amount of coal burning and high mercury content in China, the problem of domestic mercury pollution is serious, and the pressure from the international community is also increasing (mercury is easy to transfer across borders). Therefore, it is particularly urgent to str...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J23/889B01J23/83B01J20/32B01J20/08B01D53/86B01D53/64B01D53/02
Inventor 晏乃强李剑峰吴忠标瞿赞刘越
Owner SHANGHAI JIAO TONG UNIV
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