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SCR catalyst for efficiently oxidizing elemental mercury and preparation method of SCR catalyst

A technology of SCR catalyst and elemental mercury, which is applied in the field of catalysts to achieve the effects of good stability, simple steps and easy control of the reaction process

Inactive Publication Date: 2015-03-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Field test data show that in a power plant burning high Cl bituminous coal, the mercury oxidation efficiency of the SCR device can be as high as 90%; while in a power plant burning subbituminous coal with low Cl, the oxidation efficiency of mercury in the SCR device is lower than 30%

Method used

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  • SCR catalyst for efficiently oxidizing elemental mercury and preparation method of SCR catalyst

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preparation example Construction

[0043] Next, the preparation method of the catalyst of the present invention is introduced.

[0044] When preparing the catalyst of the present invention, use ammonium paratungstate as WO 3 Precursor, using ammonium metavanadate as V 2 o 5 precursors.

Embodiment 1

[0046] (1) Dissolve 1 g of oxalic acid in 20 ml of deionized water, weigh 0.3459 g of ammonium paratungstate and 0.0763 g of ammonium metavanadate and dissolve them in the oxalic acid solution, heat and stir to obtain a solution of ammonium paratungstate and ammonium metavanadate.

[0047] (2) Add 5 g of titanium dioxide powder into the mixed solution obtained in step (1), stir thoroughly, and ultrasonically impregnate for 2 hours.

[0048] (3) Place the impregnated product obtained in step (2) in a drying oven at 100° C. for 2 hours, then place it in a muffle furnace for roasting at a temperature of 550° C. for 3 hours, grind it, and pass through an 80-mesh sieve.

[0049] (4), weigh 0.0274g CuCl 2 Dissolve in 10ml deionized water, place the calcined product obtained in step (3) in CuCl 2 solution, after fully stirring, ultrasonic impregnation for 2 hours.

[0050] (5) Place the impregnated product obtained in step (4) in a drying oven to dry at 100°C for 2 hours, and then ...

Embodiment 2

[0055] (1) Dissolve 1 g of oxalic acid in 20 ml of deionized water, weigh 0.3459 g of ammonium paratungstate and 0.0763 g of ammonium metavanadate and dissolve them in the oxalic acid solution, heat and stir to obtain a solution of ammonium paratungstate and ammonium metavanadate.

[0056] (2) Add 5 g of titanium dioxide powder into the mixed solution obtained in step (1), stir thoroughly, and ultrasonically impregnate for 2 hours.

[0057] (3) Place the impregnated product obtained in step (2) in a drying oven at 100° C. for 2 hours, then place it in a muffle furnace for roasting at a temperature of 550° C. for 3 hours, grind it, and pass through an 80-mesh sieve.

[0058] (4), weigh 0.0411g CuCl 2 Dissolve in 10ml deionized water, place the calcined product obtained in step (3) in CuCl 2 solution, after fully stirring, ultrasonic impregnation for 2 hours.

[0059] (5) Place the impregnated product obtained in step (4) in a drying oven to dry at 100°C for 2 hours, and then ...

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Abstract

The invention discloses an SCR catalyst for efficiently oxidizing elemental mercury and a preparation method of the SCR catalyst. The catalyst is composed of three parts including an active component, an adjuvant and a carrier, wherein the active component is a mixture of CuCl2 and V2O5; the adjuvant is WO3; the carrier is TiO2; the mass of the catalyst is measured on the basis of the mass of the carrier; the masses of the active component and the adjuvant respectively account for 1-10% and 1-8% of the mass of the carrier; and the mass ratio of CuCl2 to V2O5 in the active component is (1-10):10. The SCR catalyst has the beneficial effects that the dependency on the content of Cl in smoke is relatively low, so that the relatively high denitration efficiency is ensured, and meanwhile the elemental mercury can be efficiently oxidized; the two active components CuCl2 and V2O5 are effectively proportioned, so that the catalytic oxidation efficiency of the catalyst to the elemental mercury is greatly increased; and the preparation method of the SCR catalyst disclosed by the invention is an impregnation method which is simple in step, easily-controlled in reaction process and good in stability.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to an SCR catalyst for efficiently oxidizing elemental mercury and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] Mercury is a global pollutant that travels through the atmosphere and is very mobile. After deposition, it is further converted into methylmercury, thereby causing harm to human health and the environment. [0003] Combustion of fossil fuels is the largest source of mercury emissions from human activities. According to statistics, the coal-fired power plants in the United States currently emit 48 tons of mercury per year, accounting for one-third of the total amount of mercury emitted by human activities; the Pollution Prevention Department of the Ministry of Environmental Protection of my country has conducted research on the mercury emission inventory and mercury reduction of major mercury-related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888B01D53/64B01D53/56B01D53/94
Inventor 陈传敏贾文波刘松涛刘永超
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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