Method for removing gaseous mercury in flue gas through catalytic oxidation of cobalt sulfide/biomass carbon composite material

A technology of biomass carbon and composite materials, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems affecting the oxidation and removal of elemental mercury, no catalytic oxidation and mercury removal catalysts, and HCl dependence. Low problems, to achieve the effect of improving flue gas treatment capacity, mild conditions, and easy availability of raw materials

Active Publication Date: 2019-01-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that it is difficult for traditional catalysts to be directly applied to the mercury removal process of non-ferrous smelting flue gas, and it is imminent to develop a composite metal catalyst that is environmentally friendly, efficient, cheap, high in sulfur resistance, and low in HCl dependence; In addition to the characteristics of low chlorine, the gas also contains a certain concentration of NO, NH 3 , it will inhibit the catalytic oxidation of elemental mercury by the catalyst; at the same time, in mercury-containing flue gas, the existence of water vapor will affect the oxidation and removal of elemental mercury. Therefore, it is necessary to develop a mercury removal catalyst that is resistant to ammonia and water is also crucial
However, there is no relevant report on its use as a catalytic oxidation demercuration catalyst

Method used

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  • Method for removing gaseous mercury in flue gas through catalytic oxidation of cobalt sulfide/biomass carbon composite material
  • Method for removing gaseous mercury in flue gas through catalytic oxidation of cobalt sulfide/biomass carbon composite material
  • Method for removing gaseous mercury in flue gas through catalytic oxidation of cobalt sulfide/biomass carbon composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Will analyze pure cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) Add to deionized water to make Co 2+ A red solution with a concentration of 0.1 mol / L, the resulting solution is marked as A; add analytically pure thiourea (SC(NH 2 ) 2 ), make Co in the mixed solution 2+ With SC(NH 2 ) 2 The molar concentration ratio of is 0.5:1, stirring for 3h, the resulting solution is denoted as B; 3g of biomass (grapefruit peel) is added to solution B for mixing and dipping, standing for 24h, drying in 80℃ oven to obtain sample C; C was placed in a tube furnace at 800°C and fired in a nitrogen atmosphere for 2 hours at a heating rate of 5°C / min; after firing, it was naturally cooled to room temperature in a nitrogen atmosphere and taken out of the firing tube to obtain black cobalt sulfide / Biomass carbon composite material. The sample obtained was analyzed by the Rigaku D / Max 2500VB+XX X-ray diffractometer, and it was found that the crystal phase of the obtained product was cobalt-nickel-pyrit...

Embodiment 2

[0048] Catalyst oxidation activity and test of the influence of different concentrations of HCl on catalyst activity:

[0049] The experiment was carried out in a fixed bed reactor, the catalyst (prepared in Example 1) was filled with 50 mg, and N 2 As Hg 0 Carrier gas, control its flow to 200mL / min, Hg in the flue gas 0 The concentration is 260μg / m 3 Left and right, another way N 2 As the balance gas, the total flow of the gas is maintained at 600 mL / min, and the experimental temperature is 150°C. Set the experimental atmosphere conditions, reaction 1: do not add any oxidizing gas, only pass in nitrogen as carrier gas and balance gas; reaction 2: pass in 6% O 2 , The rest of the gas is N 2 ; Reaction 3: pass 6% O 2 , 2ppm HCl, the remaining gas is N 2 ; Reaction 4: pass 6% O 2 , 10ppmHCl, the rest of the gas is N 2 . After flue gas treatment, the catalyst treatment efficiency was recorded after the mercury concentration reached a stable level. The result is image 3 Shown.

Embodiment 3

[0051] Test of temperature influence on catalyst activity:

[0052] The experiment was carried out in a fixed bed reactor, the catalyst (prepared in Example 1) was filled with 50 mg, and N 2 As Hg 0 Carrier gas, control its flow to 200mL / min, Hg in the flue gas 0 The concentration is 260μg / m 3 Left and right, another way N 2 As a balance gas, keep the total flow of gas at 600mL / min, and pass in an oxidizing atmosphere of 6% O 2 And 10ppm HCl. Set the reaction temperature conditions, reaction 1: 50°C; reaction 2: 100°C; reaction 3: 150°C; reaction 4: 200°C. After flue gas treatment, the catalyst treatment efficiency was recorded after the mercury concentration reached a stable level. The result is Figure 4 Shown.

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Abstract

The invention discloses a method for removing gaseous mercury in flue gas through catalytic oxidation of a cobalt sulfide/biomass carbon composite material, which can purify mercury in flue gas of different compositions by converting gas-phase elementary mercury in mercury-containing flue gas through catalytic oxidation of the cobalt sulfide/biomass carbon composite material. The method can realize high-efficiency conversion of elemental mercury under the conditions of high SO2 concentration and low hydrogen chloride concentration, and solves the problem that a traditional mercury removal catalyst is likely to deactivate under high concentration SO2 and relies on HCl; especially, the cobalt sulfide/biomass carbon composite material still has a good mercury removal effect to flue gas containing NO, NH3 and water vapor, exhibits good ammonia and water resistance, and is suitable for treating flue gas with various atmospheric components.

Description

Technical field [0001] The invention relates to a method for removing mercury from flue gas, in particular to a method for using a cobalt sulfide / biomass carbon composite catalytic material as an elemental mercury oxidation catalyst for the oxidation and removal of elemental mercury in mercury-containing flue gas, belonging to mercury pollution Emission control field. Background technique [0002] Mercury is a toxic heavy metal with persistence, accumulation, mobility and high bioaccumulation. It has been listed as the only pollutant that has an impact on a global scale except for greenhouse gases. On January 19, 2013, the United Nations Environment Program formulated the Minamata Convention to control global mercury pollution, requiring 147 member states, including my country, to take joint actions to reduce mercury emissions. In April 2016, my country adopted the decision to ratify the Minamata Convention on Mercury, and formally ratified the agreement in August of the same ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/64B01J27/043
CPCB01D53/8665B01D2258/0283B01J27/043
Inventor 刘恢游志文颜旭刘操杨姝谢小峰向开松
Owner CENT SOUTH UNIV
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