US11478784B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11478784-B2 |
| Application number | US-202016781843-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 4, 2020 |
| Priority date | Feb 4, 2020 |
| Publication date | Oct 25, 2022 |
| Grant date | Oct 25, 2022 |
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A method for ammonia decomposition to produce hydrogen, the method comprising the steps of introducing an ammonia stream to a reactor, wherein the ammonia stream comprises ammonia, wherein the reactor comprises a cobalt-based catalyst, the cobalt-based catalyst comprising 15 wt % and 70 wt % of cobalt, 5 wt % and 45 wt % of cerium, and 0.4 wt % and 0.5 wt % barium, wherein a remainder of weight of the cobalt-based catalyst is oxygen; contacting the ammonia in the ammonia stream with the cobalt-based catalyst, wherein the cobalt-based catalyst is operable to catalyze an ammonia decomposition reaction; catalyzing the ammonia decomposition reaction to cause the ammonia decomposition in the presence of the cobalt-based catalyst to produce hydrogen; and withdrawing a product stream from the reactor, the product stream comprising hydrogen.
Opening claim text (preview).
That which is claimed is: 1. A method for ammonia decomposition to produce hydrogen, the method comprising the steps of: introducing a flow of hydrogen gas to the reactor; increasing a temperature in the reactor to 500° C. at a rate of 2° C. per minute, wherein the reactor comprises a cobalt-based catalyst, the cobalt-based catalyst comprising: 15 wt % and 70 wt % of cobalt, 5 wt % and 45 wt % of cerium, and 0.4 wt % and 0.5 wt % barium, wherein a remainder of weight of the cobalt-based catalyst is oxygen; maintaining the temperature in the reactor at 500° C. for at least 3 hours to activate metal sites on the cobalt-based catalyst; introducing an ammonia stream to the reactor, wherein the ammonia stream comprises ammonia; contacting the ammonia in the ammonia stream with the cobalt-based catalyst at temperature in a range between 250-700° C. to decompose the ammonia, wherein the cobalt-based catalyst is operable to catalyze an ammonia decomposition reaction; catalyzing the ammonia decomposition reaction to cause the ammonia decomposition in the presence of the cobalt-based catalyst to produce hydrogen; and withdrawing a product stream from the reactor, the product stream comprising hydrogen. 2. The method of claim 1 , wherein a pressure in the reactor is in a range between 1 bar and 40 bar. 3. The method of claim 1 , wherein the product stream further comprises nitrogen. 4. The method of claim 1 , wherein the conversion of ammonia is greater than 95%.
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