Reactive membrane for filtration and purification of gases of impurities and method utilizing the same
First Claim
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1. A reactive membrane for removing impurities from a gas comprising:
- (a) a porous inorganic substrate; and
(b) at least one carbon layer deposited on substantially all of the porous inorganic substrate, the carbon layer being modified to present active sites which include at least partially deoxygenated metal species selected from the group consisting of manganese, magnesium, the alkali metals and mixtures thereof, wherein the metal species is chemically bonded to the carbon layer and serves as a scavenger, interacting with impurities and removing them from the gas.
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Abstract
A reactive membrane for removing impurities, such as water, oxygen and organic compounds, from a gas is provided. The reactive membrane includes a porous inorganic substrate having exposed surfaces and at least one carbon layer, which is modified to present active sites, deposited on the exposed surfaces. The active sites include metal species which are at least partially deoxygenated and are chemically bonded to the carbon layer. Methods of forming the reactive membrane and of removing impurities from a gas with the membrane are also provided.
47 Citations
146 Claims
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1. A reactive membrane for removing impurities from a gas comprising:
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(a) a porous inorganic substrate; and (b) at least one carbon layer deposited on substantially all of the porous inorganic substrate, the carbon layer being modified to present active sites which include at least partially deoxygenated metal species selected from the group consisting of manganese, magnesium, the alkali metals and mixtures thereof, wherein the metal species is chemically bonded to the carbon layer and serves as a scavenger, interacting with impurities and removing them from the gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 146)
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37. A method for forming a reactive membrane for removing homogeneous and heterogeneous impurities from gases, said method comprising:
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(a) depositing at least one layer of carbon on substantially all of a porous inorganic substrate; (b) depositing a precursor metal species on the carbon layer, thereby forming a membrane; and (c) then heating the membrane to form active sites on the carbon layer, thereby forming a reactive membrane, wherein the active sites include at least partially deoxygenated metal species selected from the group consisting of manganese, magnesium, the alkali metals and mixtures thereof, and wherein the metal species is chemically bonded to the carbon layer and serves as a scavenger, interacting with impurities and removing them from the gas. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87)
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88. A reactive membrane for removing impurities from a gas comprising:
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(a) a porous metal substrate; and (b) at least one carbon layer deposited on the porous metal substrate, the carbon layer being modified to present active sites which include at least partially deoxygenated metal species selected from the group consisting of manganese, magnesium, the alkali metals and mixtures thereof, wherein the metal species is chemically bonded to the carbon layer and serves as a scavenger, interacting with impurities and removing them from the gas. - View Dependent Claims (89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101)
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102. A method for forming a reactive membrane for removing homogeneous and heterogeneous impurities from gases, said method comprising:
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(a) depositing at least one layer of carbon on a porous metal substrate; (b) depositing a precursor metal species on the carbon layers, thereby forming a membrane; and (c) heating the membrane to form active sites on the carbon layer, thereby forming a reactive membrane, wherein the active sites include at least partially deoxygenated metal species selected from the group consisting of manganese, magnesium, the alkali metals and mixtures thereof, and wherein the metal species is chemically bonded to the carbon layer and serves as a scavenger, interacting with impurities and removing them from the gas. - View Dependent Claims (103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 132, 133, 134, 135, 136, 137)
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122. A method for forming a reactive membrane for removing homogeneous and heterogeneous impurities from gases, said method comprising:
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(a) depositing at least one layer of carbon on a porous inorganic substrate; (b) forming a membrane including the porous inorganic substrate, the at least one carbon layer, and a precursor metal species, the at least one carbon layer positioned between the substrate and the precursor metal species, the precursor metal species being deposited on the carbon layer by contacting the carbon layer with the precursor metal species in a non-aqueous solvent; and (c) heating the membrane to form active sites on the carbon layer including at least partially deoxygenated metal species selected from the group consisting of manganese, magnesium, the alkali metals and mixtures thereof, thereby forming a reactive membrane, wherein the metal species is chemically bonded to the carbon layer and serves as a scavenger, interacting with impurities and removing them from the gas. - View Dependent Claims (123, 124, 125, 126, 127, 128, 129, 130)
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131. A method for activating a reactive membrane comprising heating to greater than about 300°
- C. in a reducing atmosphere a porous inorganic substrate which includes a carbon layer having sites comprising metal species selected from the group consisting of manganese, magnesium, and the alkali metals and chemically bonded to the carbon layer, and activating the sites by at least partially deoxygenating the metal species whereby the metal species serve as a scavenger, interacting with impurities in a gas and removing the impurities from the gas.
- View Dependent Claims (138, 139, 140, 141, 142, 143, 144, 145)
Specification