WO2014164979A1 - Multicomponent mercury oxidation and capture - Google Patents

Multicomponent mercury oxidation and capture Download PDF

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Publication number
WO2014164979A1
WO2014164979A1 PCT/US2014/023996 US2014023996W WO2014164979A1 WO 2014164979 A1 WO2014164979 A1 WO 2014164979A1 US 2014023996 W US2014023996 W US 2014023996W WO 2014164979 A1 WO2014164979 A1 WO 2014164979A1
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Prior art keywords
particulate
sulfide
sorbent
oxidation
mixture
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PCT/US2014/023996
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French (fr)
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Michael A. Lucarelli
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Novinda Corporation
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Publication of WO2014164979A1 publication Critical patent/WO2014164979A1/en

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    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01J20/045—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing sulfur, e.g. sulfates, thiosulfates, gypsum
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    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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    • B01D2257/602—Mercury or mercury compounds
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Definitions

  • This invention relates generally to pollution control and more specifically, to adsorbents which substantially reduce the amount of mercury released into the environment by coal-fired utility plants and from other sources.
  • Mercury and its compounds are significant environmental pollutants and major threats to human life and natural ecosystems.
  • Mercury is of significant environmental concern because of its toxicity, persistence in the environment, and bioaccumulation in the food chain.
  • the toxicity of soluble Hg ions and elemental Hg even in very dilute concentrations has been widely reported in the literature.
  • Mercury is released readily into the environment from natural and anthropogenic sources. Because of its physical and chemical properties, mercury can also be transported regionally through various environmental cycles. Atmospheric deposition of mercury is reported to be the primary cause of elevated mercury levels in fish which is a potential threat to pregnant women and young children.
  • coal-fired power utility plants are the biggest source of mercury emissions into the air, emitting at least fifty metric tons of mercury into the atmosphere annually.
  • Coal-fired combustion flue gas streams are of particular concern because of their composition that includes trace amounts of acid gases, such as S0 2 , NOx, and HCI plus C0 2 and oxygen contents.
  • Other sources of mercury emissions may include the chlor-alkali industry, metal sulfide or smelting, gold refining, cement production, fossil fuel combustion and incineration of sewage sludge or municipal garbage or the like.
  • Hg° the oxidized mercury
  • HgCI 2 the oxidized mercury
  • Hg(l) the oxidized mercury
  • Hg(ll) the oxidized mercury
  • HgCI 2 the oxidized mercury
  • Hg(l) the oxidized mercury
  • Hg(ll) the oxidized mercury
  • Hg° is found predominantly in coal-fired boiler flue gas.
  • Mercury can also be bound to fly ash in the flue gas.
  • Mercury speciation (elemental or oxidized) and concentration is dependent on the source (e.g. the characteristics of the fuel being burned), process conditions and the
  • thermodynamically stable predominant form of mercury in the flue gases from coal-fired utilities is the elemental one (Hg°).
  • Hg° the elemental one
  • the oxidized HgCI 2 may be the major species from waste incinerators. Unlike the oxidized forms, the metal in the zero valent state is difficult to remove due its high volatility and low water solubility.
  • Sorbent injection is one of the most promising technologies for application to the utility industry as virtually all coal-fired boilers are equipped with either an electrostatic precipitator (ESP) or a baghouse. Accordingly, there has been a need for novel oxidative sorbent compositions and methods to substantially reduce mercury emissions into the environment. There has been a need for novel oxidative sorbent compositions and method which efficiently and economically substantially reduce mercury in mercury containing fluids such as vapor mercury, the elemental form of mercury, from flue gas.
  • ESP electrostatic precipitator
  • One embodiment is a process that includes injecting a mercury capture admixture into a flue gas generated by the combustion of coal in a coal-fired boiler, the mercury capture admixture comprising an oxidation particulate and a sorbent particulate; oxidizing Hg° in the flue gas to one of Hg(l) and Hg(ll) with the oxidation particulate; capturing Hg(l) or Hg(ll) onto the supported sulfide particulate thereby forming a mercury sulfide; and then separating the mercury from the flue gas.
  • Another embodiment is an oxidative sorbent composition for the oxidation and removal of mercury, the composition includes an oxidation particulate; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or an admixture thereof.
  • the present invention is concerned with an oxidative sorbent composition, a method of making an oxidative sorbeni composition, and a method of using the oxidative sorbent composition for the substantial removal of mercury from a mercury-containing fluid.
  • a first embodiment is a process that includes injecting a mercury capture admixture into a flue gas generated by the combustion of coal in a coal-fired boiler.
  • the mercury capture admixture comprising an oxidation particulate and a sorbent particulate.
  • the process further includes oxidizing Hg° in the flue gas to one of Hg(l) and Hg(ll) with the oxidation particulate; capturing Hg(l) or Hg(ll) onto the supported sulfide particulate thereby forming a mercury sulfide; and then separating the mercury from the flue gas.
  • the mercury capture admixture can be prepared by the solid state mixing of the oxidation particulate and the supported sulfide particulate.
  • the solid state mixing can include the reduction of a particle size for either or both of the oxidation particulate and the supported sulfide particulate.
  • the mercury capture admixture can be prepared by the coinjection of the oxidation particulate and the supported sulfide particulate into the flue gas.
  • the mercury capture admixture can be prepared by the pulsed or continuous injection of the oxidation particulate into the flue gas and the pulsed or continuous injection of the supported sulfide particulate into the flue gas.
  • the oxidation particulate is a metal oxide.
  • the metal oxide can be a manganese oxide, an iron oxide, and a mixture thereof.
  • One preferable manganese oxide is Mn0 2 and one preferable iron oxide is Fe 2 0 3 .
  • the oxidation particulate is substantially free of transition metal halides. That is, the oxidation particulate includes less than 5 wt.%, 4 wt.%, 3 wt.%, 2 wt.%, or 1 wt.% of a transition metal halide; preferably the oxidation particulate includes less than 0.5 wt.% or less than 0.25 wt.% of transition metal halides. Most preferably, the oxidation particulate does not include any transition metal halide.
  • the oxidation particulate is a two-electron oxidant. That is, the oxidation particulate can directly oxidize Hg° to Hg(ll) by accepting two electrons from mercury(O). Even more preferably, the oxidation particulate has a standard reduction potential that is greater (more positive) than 0.85 E°/V, for example a standard reduction potential that is greater than 1 E°/V.
  • the oxidation particulate is a peroxide, for example those peroxides selected from the group consisting of magnesium peroxide, calcium peroxide, sodium percarbonate, carbamide peroxide, and a mixture thereof.
  • the sorbent particulate is capable of adsorbing, absorbing, reacting with or otherwise affecting the concentration of free mercury in the fluid. While the sorbent preferably sorbs mercury in any oxidation state, the sorbent more preferably sorbs Hg(ll) to provide a nonvolatile, non-reactive mercury material, most preferably adhered to the surface of the sorbent.
  • the sorbent particulate can be selected from an activated carbon, a supported sulfide, or an admixture thereof.
  • the sorbent particulate includes a supported sulfide, which is a sulfide carried by a support, where the sulfide can selected from the group consisting of sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof.
  • These sulfides can include terminal sulfides, bridging sulfides, polysulfides, thiolates, and mixtures thereof.
  • copper sulfide can be sulfide-polysulfide material with copper in more than one oxidation state.
  • the support can be a silicate, clay, zeolite, or other high surface area material (e.g., activated carbon).
  • the support is selected from the group consisting of bentonite,
  • the supported sulfide is a copper sulfide carried by bentonite.
  • Another embodiment is an oxidative sorbent composition for the oxidation and removal of mercury.
  • the composition can include an oxidation particulate; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or an admixture thereof.
  • each of the oxidation particulate and the sorbent particulate has an average particle size; and wherein the average particle size of the oxidation particulate is approximately equal to the average particle size of the sorbent particulate.
  • the oxidation particulate can be a metal oxide.
  • the metal oxide can be manganese oxide (e.g., Mn0 2 ), iron oxide, magnesium peroxide, calcium peroxide, or a mixture thereof.
  • the oxidation particulate can be a peroxide.
  • the peroxide can be calcium peroxide, magnesium peroxide, sodium
  • the sorbent particulate can be a supported sulfide that consists primarily of a sulfide and a support.
  • the sulfide can be selected from the group consisting of sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof.
  • the support can be a silicate, clay, zeolite, or other high surface area material (e.g., activated carbon).
  • the support is selected from the group consisting of bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, a micaceous mineral, makatite, kanemite, octasilicate (illierite), magadiite, kenyaite, attapulgite, palygorskite, sepoilite, and a mixture thereof.
  • the supported sulfide is a copper sulfide carried by bentonite.
  • the oxidative sorbent composition for the oxidation and removal of mercury includes an oxidation particulate selected from the group consisting of a transition metal oxide selected from a group consisting of a chromium oxide, a manganese oxide, an iron oxide, and a mixture thereof, a supported transition metal oxide that consists essentially of the transition metal oxide carried by a silicate support selected from a group consisting of an inosilicates, a phyllosilicate, a tectosilicate, and a mixture thereof, and a mixture thereof; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof.
  • the oxidative sorbent composition includes an oxidation particulate selected from the group consisting of a peroxide selected from a group consisting of calcium peroxide, magnesium peroxide, sodium percarbonate, carbamide peroxide, and a mixture thereof, a supported peroxide that consists essentially of the peroxide carried by a silicate support; and a mixture thereof; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof.
  • a peroxide selected from a group consisting of calcium peroxide, magnesium peroxide, sodium percarbonate, carbamide peroxide, and a mixture thereof
  • a supported peroxide that consists essentially of the peroxide carried by a silicate support
  • a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof.
  • the oxidative sorbent composition for the oxidation and removal of mercury includes an oxidation particulate is a supported halide carried by a phyllosilicate or a tectosilicate; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof.
  • the oxidation particulate and the sorbent particulate each, individually, have average particle sizes.
  • the particle size is preferably determined by sieving, dry samples of the oxidative sorbent and sorbent particulate.
  • the average particle size of the oxidation particulate is approximately equal to an average particle size of the sorbent particulate. Even more preferably, greater than 90% of the oxidative sorbent and the sorbent particulate will pass through a 5 5 mesh sieve, a 10 mesh sieve, an 18 mesh sieve, or a 35 mesh sieve.
  • the sorbent particulate can be a supported sulfide that comprises a sulfide selected from the group consisting of a sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof, carried by a support selected from the group consisting of bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, a micaceous mineral, makatite, kanemite, octasilicate (illierite), magadiite, kenyaite, attapulgite, palyg
  • the oxidation particulate and sorbent particulate are incompatible.
  • the materials are considered incompatible if the active agents (the oxidant and the sorbent) would chemically react to inactivate or reduce the activation of one or both of the active agents.
  • oxidants are known to chemically react with sulfides to produce sulfates; in another example, oxidants are known to chemically react with some transition metal sorbents to form metal oxides or non-sorbent metal oxidation states.
  • the chemical incompatibility is determined at room temperature (about 20 °C), more preferably, the oxidant and the sorbent are incompatible at temperatures greater than about 100 °C or 150 °C. Still more preferably, the incompatibility of the oxidant and the sorbent is overcome by supporting one or both of the oxidant and/or sorbent on a support, whereas the particulate nature of the oxidant and the sorbent prevent chemical deactivation of one or both of the active agents.
  • one or more of the above described oxidative sorbent compositions is added into a flue gas generated by the combustion of coal in a coal-fired boiler.
  • the oxidation particulate can oxidize Hg° in the flue gas to at least one of Hg(l) and Hg(ll) and the sorbent particulate can capture (e.g., absorb or adsorb) Hg(l) and/or Hg(ll).
  • the mercury can be separated from the flue gas (e.g., the sorbent carrying mercury can be removed from the flue gas or duct work).
  • the process can include the injection of an admixture of the oxidation particulate and the sorbent particulate into the flue gas, the coinjection of the oxidation particulate and the sorbent particulate into the flue gas, and/or the pulsed or continuous injection of the oxidation particulate into the flue gas and the pulsed or continuous injection of the sorbent particulate into the flue gas.

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Abstract

Herein is described a process and product for mercury capture admixture from a flue gas generated by the combustion of coal in a coal-fired boiler. The process includes a mercury capture admixture (the product) that has an oxidation particulate and a sorbent particulate. The process further includes oxidizing Hg° in the flue gas to one of Hg(l) and Hg(ll) with the oxidation particulate; capturing Hg(l) or Hg(ll) onto the supported sulfide particulate thereby forming a mercury sulfide; and then separating the mercury from the flue gas.

Description

MULTICOMPONENT MERCURY OXIDATION AND CAPTURE
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This disclosure claims the benefit of priority to US Provisional Patent Application
61/778,786 filed on 13 March, 2013, the entire disclosure of which is incorporated herein in its entirety.
FIELD OF THE INVENTION
[0002] This invention relates generally to pollution control and more specifically, to adsorbents which substantially reduce the amount of mercury released into the environment by coal-fired utility plants and from other sources.
BACKGROUND
[0003] Mercury and its compounds are significant environmental pollutants and major threats to human life and natural ecosystems. Mercury is of significant environmental concern because of its toxicity, persistence in the environment, and bioaccumulation in the food chain. The toxicity of soluble Hg ions and elemental Hg even in very dilute concentrations has been widely reported in the literature. Mercury is released readily into the environment from natural and anthropogenic sources. Because of its physical and chemical properties, mercury can also be transported regionally through various environmental cycles. Atmospheric deposition of mercury is reported to be the primary cause of elevated mercury levels in fish which is a potential threat to pregnant women and young children.
[0004] In the United States, coal-fired power utility plants are the biggest source of mercury emissions into the air, emitting at least fifty metric tons of mercury into the atmosphere annually. Coal-fired combustion flue gas streams are of particular concern because of their composition that includes trace amounts of acid gases, such as S02, NOx, and HCI plus C02 and oxygen contents. Other sources of mercury emissions may include the chlor-alkali industry, metal sulfide or smelting, gold refining, cement production, fossil fuel combustion and incineration of sewage sludge or municipal garbage or the like.
[0005] The major chemical forms of the metal in the combustion flue gases are elemental Hg° (zerovalent) and the oxidized mercury, HgCI2, Hg(l) and Hg(ll). Mercury vapor, Hg°, is found predominantly in coal-fired boiler flue gas. Mercury can also be bound to fly ash in the flue gas. Mercury speciation (elemental or oxidized) and concentration is dependent on the source (e.g. the characteristics of the fuel being burned), process conditions and the
constituents in the ensuing gas streams (e.g., Cl2, HCI, S02, NOx). The thermodynamically stable predominant form of mercury in the flue gases from coal-fired utilities is the elemental one (Hg°). However, the oxidized HgCI2 may be the major species from waste incinerators. Unlike the oxidized forms, the metal in the zero valent state is difficult to remove due its high volatility and low water solubility.
[0006] There is no currently available control method that efficiently collects all mercury species present in the flue gas stream. The existing mercury removal technologies involve scrubbing solution as in a wet flue gas desulfurization system, filtration and other inertial methods, electrostatic precipitation, and activated carbon based sorbents and a few other types of sorbents. For example, phyllosilicate mineral based sorbent has been described using a polyvalent metal sulfide prepared by ion exchange of tin, iron, titanium, zirconium and molybdenum to the support, and sequentially controlled addition of sulfide ions to the silicate substrate.
[0007] Sorbent injection is one of the most promising technologies for application to the utility industry as virtually all coal-fired boilers are equipped with either an electrostatic precipitator (ESP) or a baghouse. Accordingly, there has been a need for novel oxidative sorbent compositions and methods to substantially reduce mercury emissions into the environment. There has been a need for novel oxidative sorbent compositions and method which efficiently and economically substantially reduce mercury in mercury containing fluids such as vapor mercury, the elemental form of mercury, from flue gas.
SUMMARY
[0008] One embodiment is a process that includes injecting a mercury capture admixture into a flue gas generated by the combustion of coal in a coal-fired boiler, the mercury capture admixture comprising an oxidation particulate and a sorbent particulate; oxidizing Hg° in the flue gas to one of Hg(l) and Hg(ll) with the oxidation particulate; capturing Hg(l) or Hg(ll) onto the supported sulfide particulate thereby forming a mercury sulfide; and then separating the mercury from the flue gas.
[0009] Another embodiment is an oxidative sorbent composition for the oxidation and removal of mercury, the composition includes an oxidation particulate; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or an admixture thereof.
DETAILED DESCRIPTION
[0010] The present invention is concerned with an oxidative sorbent composition, a method of making an oxidative sorbeni composition, and a method of using the oxidative sorbent composition for the substantial removal of mercury from a mercury-containing fluid.
[0011] A first embodiment is a process that includes injecting a mercury capture admixture into a flue gas generated by the combustion of coal in a coal-fired boiler. The mercury capture admixture comprising an oxidation particulate and a sorbent particulate. The process further includes oxidizing Hg° in the flue gas to one of Hg(l) and Hg(ll) with the oxidation particulate; capturing Hg(l) or Hg(ll) onto the supported sulfide particulate thereby forming a mercury sulfide; and then separating the mercury from the flue gas.
[0012] In one example, the mercury capture admixture can be prepared by the solid state mixing of the oxidation particulate and the supported sulfide particulate. The solid state mixing can include the reduction of a particle size for either or both of the oxidation particulate and the supported sulfide particulate. In another example, the mercury capture admixture can be prepared by the coinjection of the oxidation particulate and the supported sulfide particulate into the flue gas. In still another example, the mercury capture admixture can be prepared by the pulsed or continuous injection of the oxidation particulate into the flue gas and the pulsed or continuous injection of the supported sulfide particulate into the flue gas.
[0013] Preferably, the oxidation particulate is a metal oxide. For example, the metal oxide can be a manganese oxide, an iron oxide, and a mixture thereof. One preferable manganese oxide is Mn02 and one preferable iron oxide is Fe203.
[0014] In one example, the oxidation particulate is substantially free of transition metal halides. That is, the oxidation particulate includes less than 5 wt.%, 4 wt.%, 3 wt.%, 2 wt.%, or 1 wt.% of a transition metal halide; preferably the oxidation particulate includes less than 0.5 wt.% or less than 0.25 wt.% of transition metal halides. Most preferably, the oxidation particulate does not include any transition metal halide.
[0015] More preferably, the oxidation particulate is a two-electron oxidant. That is, the oxidation particulate can directly oxidize Hg° to Hg(ll) by accepting two electrons from mercury(O). Even more preferably, the oxidation particulate has a standard reduction potential that is greater (more positive) than 0.85 E°/V, for example a standard reduction potential that is greater than 1 E°/V. In one example, the oxidation particulate is a peroxide, for example those peroxides selected from the group consisting of magnesium peroxide, calcium peroxide, sodium percarbonate, carbamide peroxide, and a mixture thereof.
[0016] Herein, the sorbent particulate is capable of adsorbing, absorbing, reacting with or otherwise affecting the concentration of free mercury in the fluid. While the sorbent preferably sorbs mercury in any oxidation state, the sorbent more preferably sorbs Hg(ll) to provide a nonvolatile, non-reactive mercury material, most preferably adhered to the surface of the sorbent. For example, the sorbent particulate can be selected from an activated carbon, a supported sulfide, or an admixture thereof.
[0017] When the sorbent particulate includes a supported sulfide, which is a sulfide carried by a support, where the sulfide can selected from the group consisting of sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof. These sulfides can include terminal sulfides, bridging sulfides, polysulfides, thiolates, and mixtures thereof. For example, copper sulfide can be sulfide-polysulfide material with copper in more than one oxidation state. The support can be a silicate, clay, zeolite, or other high surface area material (e.g., activated carbon). Preferably, the support is selected from the group consisting of bentonite,
montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, a micaceous mineral, makatite, kanemite, octasilicate (illierite), magadiite, kenyaite, attapulgite, palygorskite, sepoilite, and a mixture thereof. In one example, the supported sulfide is a copper sulfide carried by bentonite.
[0018] Another embodiment is an oxidative sorbent composition for the oxidation and removal of mercury. The composition can include an oxidation particulate; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or an admixture thereof. In this embodiment, each of the oxidation particulate and the sorbent particulate has an average particle size; and wherein the average particle size of the oxidation particulate is approximately equal to the average particle size of the sorbent particulate.
[0019] In one example, the oxidation particulate can be a metal oxide. For example, the metal oxide can be manganese oxide (e.g., Mn02), iron oxide, magnesium peroxide, calcium peroxide, or a mixture thereof. In another example, the oxidation particulate can be a peroxide. For example, the peroxide can be calcium peroxide, magnesium peroxide, sodium
percarbonate, carbamide peroxide, or a mixture thereof. [0020] As described above, the sorbent particulate can be a supported sulfide that consists primarily of a sulfide and a support. The sulfide can be selected from the group consisting of sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof. The support can be a silicate, clay, zeolite, or other high surface area material (e.g., activated carbon).
Preferably, the support is selected from the group consisting of bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, a micaceous mineral, makatite, kanemite, octasilicate (illierite), magadiite, kenyaite, attapulgite, palygorskite, sepoilite, and a mixture thereof. In one example, the supported sulfide is a copper sulfide carried by bentonite.
[0021] In one example, the oxidative sorbent composition for the oxidation and removal of mercury includes an oxidation particulate selected from the group consisting of a transition metal oxide selected from a group consisting of a chromium oxide, a manganese oxide, an iron oxide, and a mixture thereof, a supported transition metal oxide that consists essentially of the transition metal oxide carried by a silicate support selected from a group consisting of an inosilicates, a phyllosilicate, a tectosilicate, and a mixture thereof, and a mixture thereof; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof. In another example, the oxidative sorbent composition includes an oxidation particulate selected from the group consisting of a peroxide selected from a group consisting of calcium peroxide, magnesium peroxide, sodium percarbonate, carbamide peroxide, and a mixture thereof, a supported peroxide that consists essentially of the peroxide carried by a silicate support; and a mixture thereof; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof. In still another example, the oxidative sorbent composition for the oxidation and removal of mercury includes an oxidation particulate is a supported halide carried by a phyllosilicate or a tectosilicate; and a sorbent particulate selected from the group consisting of an activated carbon, a supported sulfide, or a mixture thereof.
[0022] Preferably, in these examples, the oxidation particulate and the sorbent particulate each, individually, have average particle sizes. The particle size is preferably determined by sieving, dry samples of the oxidative sorbent and sorbent particulate. In one instance, the average particle size of the oxidation particulate is approximately equal to an average particle size of the sorbent particulate. Even more preferably, greater than 90% of the oxidative sorbent and the sorbent particulate will pass through a 5 5 mesh sieve, a 10 mesh sieve, an 18 mesh sieve, or a 35 mesh sieve.
[0023] The sorbent particulate can be a supported sulfide that comprises a sulfide selected from the group consisting of a sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof, carried by a support selected from the group consisting of bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, a micaceous mineral, makatite, kanemite, octasilicate (illierite), magadiite, kenyaite, attapulgite, palygorskite, sepoilite, and a mixture thereof. In one instance, sorbent particulate is a bentonite supported copper sulfide.
[0024] In a particularly relevant example, the oxidation particulate and sorbent particulate are incompatible. As used herein, the materials are considered incompatible if the active agents (the oxidant and the sorbent) would chemically react to inactivate or reduce the activation of one or both of the active agents. By way of example, oxidants are known to chemically react with sulfides to produce sulfates; in another example, oxidants are known to chemically react with some transition metal sorbents to form metal oxides or non-sorbent metal oxidation states. Preferably, the chemical incompatibility is determined at room temperature (about 20 °C), more preferably, the oxidant and the sorbent are incompatible at temperatures greater than about 100 °C or 150 °C. Still more preferably, the incompatibility of the oxidant and the sorbent is overcome by supporting one or both of the oxidant and/or sorbent on a support, whereas the particulate nature of the oxidant and the sorbent prevent chemical deactivation of one or both of the active agents.
[0025] In another embodiment, one or more of the above described oxidative sorbent compositions is added into a flue gas generated by the combustion of coal in a coal-fired boiler. Therein, the oxidation particulate can oxidize Hg° in the flue gas to at least one of Hg(l) and Hg(ll) and the sorbent particulate can capture (e.g., absorb or adsorb) Hg(l) and/or Hg(ll). Thereafter, the mercury can be separated from the flue gas (e.g., the sorbent carrying mercury can be removed from the flue gas or duct work). The process can include the injection of an admixture of the oxidation particulate and the sorbent particulate into the flue gas, the coinjection of the oxidation particulate and the sorbent particulate into the flue gas, and/or the pulsed or continuous injection of the oxidation particulate into the flue gas and the pulsed or continuous injection of the sorbent particulate into the flue gas. [0026] Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited, except as by the appended claims.

Claims

WHAT IS CLAIMED:
1. An oxidative sorbent composition for the oxidation and removal of mercury, the composition comprising:
an oxidation particulate selected from the group consisting of
a transition metal oxide selected from a group consisting of a chromium oxide, a manganese oxide, an iron oxide, and a mixture thereof,
a supported transition metal oxide that consists essentially of the transition metal oxide carried by a silicate support selected from a group consisting of an inosilicates, a phyllosilicate, a tectosilicate, and a mixture thereof, and
a mixture thereof; and
a sorbent particulate selected from the group consisting of an activated carbon, supported sulfide, or a mixture thereof.
2. An oxidative sorbent composition for the oxidation and removal of mercury, the composition comprising:
an oxidation particulate selected from the group consisting of
a peroxide selected from a group consisting of calcium peroxide, magnesium peroxide, sodium percarbonate, carbamide peroxide, and a mixture thereof,
a supported peroxide that consists essentially of the peroxide carried by silicate support; and
a mixture thereof; and
a sorbent particulate selected from the group consisting of an activated carbon, supported sulfide, or a mixture thereof.
3. An oxidative sorbent composition for the oxidation and removal of mercury, the composition comprising:
an oxidation particulate is a supported halide carried by a phyllosilicate or a tectosilicate; and
a sorbent particulate selected from the group consisting of an activated carbon, supported sulfide, or a mixture thereof.
4. The oxidative sorbent composition of any one of the preceding claims, wherein an average particle size of the oxidation particulate is approximately equal to an average particle size of the sorbent particulate.
5. The oxidative sorbent composition of any one of the preceding claims, wherein the sorbent particulate is a supported sulfide that comprises a sulfide selected from the group consisting of a sodium sulfide, a potassium sulfide, a manganese sulfide, an iron sulfide, a cobalt sulfide, a nickel sulfide, a copper sulfide, a zinc sulfide, and a mixture thereof, carried by a support selected from the group consisting of bentonite, montmorillonite, hectorite, beidellite, saponite, nontronite, volkonskoite, sauconite, stevensite, fluorohectorite, laponite, rectonite, vermiculite, illite, a micaceous mineral, makatite, kanemite, octasilicate (illierite), magadiite, kenyaite, attapulgite, palygorskite, sepoilite, and a mixture thereof.
6. The oxidative sorbent composition of claim 5, wherein the supported sulfide is a bentonite supported copper sulfide.
7. The oxidative sorbent composition of any one of the preceding claims, wherein the oxidation particulate and sorbent particulate are incompatible.
8. A process comprising:
injecting the oxidative sorbent composition of any one of the preceding claims into a flue gas generated by the combustion of coal in a coal-fired boiler;
oxidizing Hg° in the flue gas to one of Hg(l) and Hg(ll) with the oxidation particulate;
capturing Hg(l) or Hg(ll) with the sorbent particulate; and
separating the mercury from the flue gas.
9. The process of claim 8 further comprising preparing the oxidative sorbent composition by coinjection of the oxidation particulate and the sorbent particulate into the flue gas.
10. The process of claim 8 further comprising preparing the oxidative sorbent composition by pulsed or continuous injection of the oxidation particulate into the flue gas and the pulsed or continuous injection of the sorbent particulate into the flue gas.
PCT/US2014/023996 2013-03-13 2014-03-12 Multicomponent mercury oxidation and capture WO2014164979A1 (en)

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CN104907085A (en) * 2015-05-12 2015-09-16 山东科技大学 Preparation method for copper sulphide-montmorillonite nano composite material
WO2016126550A1 (en) * 2015-02-02 2016-08-11 Novinda Corporation Expanded, mercury-sorbent materials
CN108940378A (en) * 2018-07-17 2018-12-07 江苏中能电力设备有限公司 A kind of demercuration catalyst and its preparation method and application for flue gas
WO2019018132A1 (en) * 2017-07-17 2019-01-24 Cabot Corporation Erodants as conveyance aids and method of mercury removal
CN110394183A (en) * 2019-07-29 2019-11-01 常州大学 A kind of ATP/Zn0.5Cd0.5The preparation method of S composite visible light catalyst
US10792612B2 (en) 2015-03-16 2020-10-06 University Of Wyoming Methods and compositions for the removal of mercury from gases
CN112237822A (en) * 2020-09-17 2021-01-19 中南大学 Method for recovering elemental mercury in nonferrous smelting flue gas
WO2021257349A1 (en) * 2020-06-15 2021-12-23 Environmental Energy Services, Inc. Activated amended silicate compositions for mercury control
CN113926304A (en) * 2021-03-22 2022-01-14 青岛大学 Low-temperature demercuration adsorbent for coal-fired flue gas
CZ309479B6 (en) * 2021-07-15 2023-02-15 Absory s.r.o Sorbent made from expanded inorganic materials for reducing the content of mercury and other metals in flue gas

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US20110230334A1 (en) * 2007-08-02 2011-09-22 David Goldberg Composition, Production And Use Of Sorbent Particles For Flue Gas Desulfurization

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US7048781B1 (en) * 2002-10-07 2006-05-23 Ada Technologies, Inc. Chemically-impregnated silicate agents for mercury control
US20110230334A1 (en) * 2007-08-02 2011-09-22 David Goldberg Composition, Production And Use Of Sorbent Particles For Flue Gas Desulfurization

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016126550A1 (en) * 2015-02-02 2016-08-11 Novinda Corporation Expanded, mercury-sorbent materials
US10792612B2 (en) 2015-03-16 2020-10-06 University Of Wyoming Methods and compositions for the removal of mercury from gases
CN104907085A (en) * 2015-05-12 2015-09-16 山东科技大学 Preparation method for copper sulphide-montmorillonite nano composite material
WO2019018132A1 (en) * 2017-07-17 2019-01-24 Cabot Corporation Erodants as conveyance aids and method of mercury removal
CN108940378B (en) * 2018-07-17 2021-04-30 江苏中能电力设备有限公司 Demercuration catalyst for flue gas and preparation method and application thereof
CN108940378A (en) * 2018-07-17 2018-12-07 江苏中能电力设备有限公司 A kind of demercuration catalyst and its preparation method and application for flue gas
CN110394183A (en) * 2019-07-29 2019-11-01 常州大学 A kind of ATP/Zn0.5Cd0.5The preparation method of S composite visible light catalyst
WO2021257349A1 (en) * 2020-06-15 2021-12-23 Environmental Energy Services, Inc. Activated amended silicate compositions for mercury control
CN112237822B (en) * 2020-09-17 2021-10-15 中南大学 Method for recovering elemental mercury in nonferrous smelting flue gas
CN112237822A (en) * 2020-09-17 2021-01-19 中南大学 Method for recovering elemental mercury in nonferrous smelting flue gas
CN113926304A (en) * 2021-03-22 2022-01-14 青岛大学 Low-temperature demercuration adsorbent for coal-fired flue gas
CN113926304B (en) * 2021-03-22 2024-01-16 青岛大学 Low-temperature mercury-removing adsorbent for coal-fired flue gas
CZ309479B6 (en) * 2021-07-15 2023-02-15 Absory s.r.o Sorbent made from expanded inorganic materials for reducing the content of mercury and other metals in flue gas

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