Attapulgite carrier catalyst for oxidation of elemental mercury in flue gas and preparation method thereof

An oxidation catalyst and attapulgite technology, which is applied in the field of elemental mercury oxidation catalyst and its preparation, can solve the problems of increased system energy consumption and operating costs, little attention to low-temperature catalytic performance, difficulty in popularization and practical application, etc., to achieve improved The effect of catalytic oxidation efficiency, avoidance of preheating energy consumption, and improvement of dispersion performance

Active Publication Date: 2012-12-12
江苏昆仑互联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 The specific surface area is low, and activated carbon is expensive, so the selection of new and effective catalyst supports has become one of the research hotspots of SCR catalysts
The publication number is CN101528343, and the invention patent titled "Metallic Mercury Oxidation Catalyst" proposes molybdenum and vanadium composite oxidation catalyst (MoV 2 o 8 ), has excellent elemental mercury conversion efficiency without increasing catalyst consumption, yet molybdenum and vanadium oxides are heavy metal oxides with high toxicity and high pollution, so it is difficult to promote and practical application; the publication number is CN1698931 and the name is " Catalytic Oxidation Flue Gas Mercury Removal Method” patent proposes a method for catalytic oxidation of mercury in flue gas, using oxides of transition metals such as Fe, Co, Ni, Cu, Mn as active components to catalyze the oxidation of elemental mercury. However, this The operating temperature of the catalyst proposed in the patent is generally above 200°C to exert a good catalytic adsorption effect, while the temperature of the flue gas after conventional desulfurization and dust removal is generally lower than 160°C. If the catalytic oxidation performance of the catalyst for elemental mercury is to be exerted, Flue gas must be reheated, which will greatly increase system energy consumption and operating costs
In addition, US2003170159, WO2006009079 and other patents report on the mercury oxidation performance of some noble metal or transition metal oxide catalysts, but these patents pay little attention to the catalyst support and low-temperature catalytic performance

Method used

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  • Attapulgite carrier catalyst for oxidation of elemental mercury in flue gas and preparation method thereof
  • Attapulgite carrier catalyst for oxidation of elemental mercury in flue gas and preparation method thereof
  • Attapulgite carrier catalyst for oxidation of elemental mercury in flue gas and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Accurately weigh 10g of ferric nitrate, dissolve it in 40ml of ethylene glycol solution, stir at a constant speed for 20 minutes under magnetic stirring until the ferric nitrate is completely dissolved, then stir vigorously in an oil bath at 70°C and full reflux for 6 to 7 hours to form γ-Fe 2 o 3 Sol. Then add 4 g of Fe-modified attapulgite powder, stir vigorously at 60° C. for 8 to 12 hours, and age for one day. Filter and wash with distilled water 5-6 times, then vacuum-dry at 55°C for one day, and grind into powder. Calcinate at 300°C for 2-4 hours, grind again and pack into bags. Preparation of γ-Fe with Fe-modified attapulgite as carrier 2 o 3 Doped flue gas elemental mercury oxidation catalyst.

[0025] Take by weighing 0.5g above-mentioned catalyzer, in its tubular fixed-bed reactor, pass into composition and be 6% O 2 , 12% CO 2 , 300ppm NO, 50ppm Cl 2 , 100ml / min N2 (as a carrier of mercury vapor), zero-valent mercury 20±1μg / m 3 simulated smoke. The...

Embodiment 2

[0027] A certain amount of cerous nitrate (3mol / L) was slowly added into a certain concentration of citric acid aqueous solution (0.2mol / L) (n(Ce 3+ ) / n(C 6 h 8 (O7)=1:3), after it is completely dissolved, stir at 65°C for 6-8 hours to form CeO 2 Sol. Then add 4 g of Fe-modified attapulgite powder, stir for 3 hours, filter, wash with distilled water 5-6 times, then vacuum-dry at 55°C for one day, calcinate at 200°C for 3 hours, and grind. Preparation of CeO with Fe-modified attapulgite as carrier 2 Doped flue gas elemental mercury oxidation catalyst.

[0028] Take by weighing 0.5g above-mentioned catalyzer, in its tubular fixed-bed reactor, pass into composition and be 6% O 2 , 12% CO 2 , 300ppm NO, 50ppm Cl 2 , 100ml / min N 2 (as a carrier of mercury vapor), zero-valent mercury 20±1μg / m 3 simulated smoke. The temperature is 200°C and the space velocity is 38000h -1 Under the condition of , when the catalyst reaches the stable catalytic stage, the oxidation efficienc...

Embodiment 3

[0030] First take 24mL of isopropanol and 5.4mL of acetic acid and stir evenly for 10min to obtain a mixed solution. Weigh 2g of tungsten chloride (WCl 6 ) into the mixed solution, the solution immediately becomes turbid and dark blue, stirring continuously to form a uniform dark blue HWO 3 , then add 0.6 mL of H 2 o 2 , wait for the solution to form a clear yellow-green to get WO 3 Sol. Then add 4 g of Fe-modified attapulgite powder, stir for 3 hours, filter, wash with distilled water 5-6 times, then vacuum-dry at 55°C for one day, calcinate at 300°C for 2-4 hours, and grind. Preparation of WO with Fe-modified attapulgite as carrier 3 Doped flue gas elemental mercury oxidation catalyst.

[0031] Take by weighing 0.5g above-mentioned catalyzer, in its tubular fixed-bed reactor, pass into composition and be 6% O 2 , 12% CO 2 , 300ppm NO, 50ppm Cl 2 , 100ml / min N 2 (as a carrier of mercury vapor), zero-valent mercury 20±1μg / m 3 simulated smoke. The temperature is 200...

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Abstract

The invention relates to a modified attapulgite supported catalyst for oxidation of elemental mercury and a preparation method thereof, and belongs to the field of atmospheric pollution treatment technologies and environmental protection catalytic materials. The preparation method comprises the following steps of: preparing a modified attapulgite of a transition metal selected from Fe, Zn, Cu, Mn and Ce through an ion exchange method and using the attapulgite as a catalyst carrier; adding a certain amount of an active oxide component of one or more metal elements selected from Fe, Zn, Cu, Mn, Ce, W, Co, Ag, Au, Pd and V by the adoption of a sol-gel method; drying, calcining, and sieving to prepare the catalyst. Based on the total mass of the catalyst as the reference, the content of the loaded active metal oxide is 10-30 wt%. The catalyst has characteristics of high activity and low-temperature adaptability, and has a wide application prospect in the field of mercury cleaning in flue gas.

Description

technical field [0001] The invention relates to a catalyst for oxidation of elemental mercury (HgO) with modified attapulgite as a carrier and a preparation method thereof, belonging to the fields of air pollution control technology and environmental protection catalytic materials. Background technique [0002] Mercury is a toxic trace heavy metal element with strong cohesion and is stable in the air. After long-term accumulation, it will pollute the environment and have toxic effects on organisms and humans. Coal contains trace amounts of mercury. Due to the huge amount of coal burned in the world every year, mercury emissions during coal combustion have become the main source of mercury pollution. In coal-fired flue gas, mercury mainly exists in three forms: elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ), particulate mercury (Hg p ). Among them, Hg 2+ and Hg p The proportion is small, and it is easily absorbed by the desulfurization device and dust removal devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/83B01J23/888B01D53/86B01D53/64
Inventor 仓辉陆玉韩粉女许琦奚新国蔡照胜
Owner 江苏昆仑互联科技有限公司
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