A catalyst used for oxidation of elementary substance mercury in coal-fired flue gas, and a preparation method and a regeneration method of the catalyst

A technology of coal-fired flue gas and catalyst, which is applied in the directions of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of low catalytic oxidation efficiency of catalysts, inability to recycle catalysts, and inability to separate catalysts. Excellent catalytic oxidation performance, good economic benefits, and the effect of avoiding secondary pollution

Active Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a catalyst for the oxidation of elemental mercury in coal-fired flue gas, as well as a preparation method and a regeneration method of the catalyst, so as to solve the problem of low catalytic oxidation efficiency of the current catalyst, As well as the problem of fly ash utilization caused by the inability of the catalyst to be separated from the fly ash after the adsorption of mercury and the problem that the catalyst cannot be recycled

Method used

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  • A catalyst used for oxidation of elementary substance mercury in coal-fired flue gas, and a preparation method and a regeneration method of the catalyst
  • A catalyst used for oxidation of elementary substance mercury in coal-fired flue gas, and a preparation method and a regeneration method of the catalyst
  • A catalyst used for oxidation of elementary substance mercury in coal-fired flue gas, and a preparation method and a regeneration method of the catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A magnetic separator is used to separate the magnetic beads from the fly ash, and after grinding, a 200-mesh standard sieve is used to screen the magnetic beads with a suitable particle size. Measure 0.2g CuCl 2 2H 2 O in a beaker, add 100ml deionized water and stir until completely dissolved, then add 2 2 g of magnetic beads were added to the aqueous solution, and mechanically stirred at room temperature for 2 hours, the magnetic beads loaded with active components were filtered and then dried in an oven at 100° C. for 12 hours to obtain the catalyst. The mass ratio of the active component to the support in the catalyst is 10%. The hysteresis curves of the prepared catalysts are shown in the attached figure 2 As shown, the catalyst exhibits superparamagnetism, so the catalyst after adsorbing mercury can be easily separated from the fly ash by magnetic separation for recycling.

[0035] The catalyst prepared above was placed in a fixed-bed reactor to evaluate the c...

Embodiment 2

[0040] A magnetic separator is used to separate the magnetic beads from the fly ash, and after grinding, a 200-mesh standard sieve is used to screen the magnetic beads with a suitable particle size. Measure 0.1g CuCl 2 2H 2 O in a beaker, add 50ml deionized water and stir until completely dissolved, then slowly add 2g magnetic beads under continuous stirring, and mechanically stir for 2 hours at room temperature, filter the magnetic beads loaded with active components and put them in an oven Dry at 100°C for 12 hours to obtain the catalyst. The mass ratio of the active component to the support in the catalyst is 3%. The hysteresis curve of the prepared catalyst is similar to that of the catalyst described in Example 1, and will not be repeated here.

[0041] The catalyst prepared above was placed in a fixed-bed reactor to evaluate the catalytic oxidation activity of mercury, wherein the simulated flue gas component was 4% O 2 ,12%CO 2 ,10ppm HCl,1200ppmSO 2 ,300ppm NO,50...

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Abstract

The invention discloses a catalyst used for oxidation of elementary substance mercury in coal-fired flue gas. The catalyst can achieve efficient catalytic oxidation of the elementary substance mercury, and the catalyst adsorbing the mercury is prone to magnetic separation from fly ash so as to achieve cyclic utilization. The catalyst is characterized in that: the catalyst is formed by loading the surface of a carrier with an active component having good oxidation performance for the elementary substance mercury; the active component is CuCl2; and the carrier relates to magnetic bead particles. The invention also discloses a preparation method of the catalyst and an activation and regeneration method after the catalyst is deactivated. The magnetic bead particles in the fly ash are adopted as the carrier, modified by loading the surface of the carrier with the active catalytic component, and subjected to mercury control, so that economic benefit is good. In particular, the modified magnetic bead particles absorbing the mercury are liable to separate from the fly ash through a magnetic separation technology, and the mercury adsorbed on the surfaces of the magnetic bead particles are controlled in a centralized manner, thus avoiding secondary pollution of the mercury. In addition, regeneration and cyclic utilization of the modified magnetic beads are achieved, and the cost of mercury control is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of mercury removal in coal-fired flue gas, and in particular relates to a regenerable catalyst for catalytic oxidation of elemental mercury in coal-fired flue gas, a preparation method thereof and a regeneration method after deactivation of the catalyst. Background technique [0002] Mercury is a kind of nerve poison, which is highly cumulative and irreversible, and poses a great threat to human health. A survey report released by the United Nations Environment Program in 2013 pointed out that coal-fired power plants are one of the most important sources of anthropogenic mercury pollution. According to statistics, the annual global coal-burning mercury emissions amount to 475 tons, accounting for about 24% of the global total mercury emissions. As the largest coal-fired mercury pollution source, coal-fired power stations account for more than 85% of the total mercury emissions from coal-fired power plants, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/10B01D53/86B01D53/64
Inventor 赵永椿杨建平张军营郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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