Methods of producing oxygen reduction catalyst
First Claim
1. An oxygen reduction catalyst comprising (a) about 95 wt % to about 99.9 wt % carbon black, and (b) about 0.1 wt % to about 5.0 wt % metal, and (c) about 0.05 wt % to about 5.0 wt % nitrogen derived from non-polymerized molecules.
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Abstract
Methods of making an oxygen reduction catalyst are described in which carbon black, one or more metal-containing and/or nitrogen-containing precursor(s) are provided to a reaction zone, and the carbon black is rendered catalytically active. To form this catalytic activity, the carbon black and one or more metal-containing and/or nitrogen-containing precursor(s) are introduced to a reaction zone heated to a temperature of between about 600 and about 1000 degrees Celsius, and maintained together in the reaction zone for a cumulative time between 5 seconds and 240 minutes.
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Citations
64 Claims
- 1. An oxygen reduction catalyst comprising (a) about 95 wt % to about 99.9 wt % carbon black, and (b) about 0.1 wt % to about 5.0 wt % metal, and (c) about 0.05 wt % to about 5.0 wt % nitrogen derived from non-polymerized molecules.
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19. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and a reducing agent to a reaction zone; and
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
maintaining the temperature in the reaction zone via heating with a heat source. - View Dependent Claims (52, 53, 54)
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55. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
introducing a carrier gas to the reaction zone, wherein the carrier gas comprises nitrogen, argon, helium, or suitable combinations thereof.
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56. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone, wherein the one or more metal-containing and/or nitrogen-containing precursor(s) comprises at least one precursor comprising a metal and at least one precursor comprising a nitrogen, and the nitrogen-containing precursor comprises ammonia; and
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes.
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57. A method of making particles of a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
producing the particles at a production rate of not less than about 10 grams per day. - View Dependent Claims (58, 59)
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60. A method of making particles of a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
producing the particles at a production rate in the range from about 10 grams per day to about 100 kilograms per hour.
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61. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
maintaining the reaction zone vertical tube surrounded in part by a heating element.
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62. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
maintaining the reaction zone rotating kiln tilted at an angle from the horizontal.
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63. A method of making a catalyst, the method comprising:
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providing carbon black, one or more metal-containing and/or nitrogen-containing precursor(s), and an optional reducing agent to a reaction zone;
heating the reaction zone to a temperature of between about 600 and about 1000 degrees Celsius and maintaining the carbon black, the one or more metal-containing and/or nitrogen-containing precursor(s), and the reducing agent in the reaction zone while so heated for a cumulative time in the range from between about 5 seconds and about 240 minutes; and
providing carbon black particles widely dispersed over a supporting surface to the reaction zone.
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64. A method of making a catalyst, comprising:
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entraining an atomized carbon black/metal salt fluid suspension in a gas mixture comprising a nitrogen-containing gas, a reducing gas, and a carrier gas;
directing the gas mixture and entrained suspension along a flow path past a heat source;
heating the gas mixture and entrained suspension so that the temperature at the surface of the atomized carbon black/metal salt fluid suspension is in the range from about 600 to about 1000 degrees Celsius; and
heating the gas mixture and entrained suspension for a cumulative time in the range from about 5 seconds to about 240 minutes.
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Specification