Metal-decorated barium calcium aluminum oxide catalyst for NH3 synthesis and cracking and methods of forming the same
Catalysts for NH 3 cracking and/or synthesis generally include barium calcium aluminum oxide compounds decorated with ruthenium, cobalt, or both. These catalysts can be bonded to a metal structure, which improves thermal conductivity and gas conductance.
1. A method of cracking NH 3 into a N 2 +H 2 +NH 3 mixture comprising:
exposing NH 3 to a catalyst comprising barium calcium aluminum oxide decorated with a catalytic species;
wherein the catalytic species comprises one or more selected from the group consisting of ruthenium, cobalt, and cobalt oxide.
2. The method of claim 1 wherein the barium calcium aluminum oxide decorated with catalytic species to which the NH 3 is exposed is bonded to a metal monolith.
3. The method of claim 2 wherein the metal monolith is heated by passing an electric current therethrough while the NH 3 is exposed to the catalyst.
4. The method of claim 1 wherein the barium calcium aluminum oxide is selected from the group consisting of Ba 21 Ca 16 Al 6 O 46 , BaCaAl 2 O 6 , Ba 5 Ca 7 Al 8 O 24 , Ba 3 Ca 3 Al 2 O 12 , Ba 2 Ca 5 Al 2 O 10 , BaCaAl 2 O 5 , and Ba 2 CaAl 2 O 6 .
5. The method of claim 1 wherein the catalyst species comprises ruthenium and cobalt, ruthenium and cobalt oxide, or ruthenium, cobalt and cobalt oxide.
6. The method of claim 1 wherein aluminum oxide in the barium calcium aluminum oxide is partially or fully replaced with boron oxide.
7. A method of synthesizing NH 3 from a N 2 +H 2 mixture comprising:
exposing N 2 +H 2 to a catalyst comprising barium calcium aluminum oxide decorated with a catalytic species;
wherein the catalytic species comprises cobalt.
8. The method of claim 7 wherein the barium calcium aluminum oxide decorated with catalytic species to which the N 2 +H 2 is exposed is bonded to a metal monolith.
9. The method of claim 8 in wherein the metal monolith is heated by passing an electric current through it while the N 2 +H 2 is exposed to the catalyst.
10. The method of claim 7 wherein the barium calcium aluminum oxide of the catalyst is selected from the group consisting of Ba 21 Ca 16 Al 6 O 46 , BaCaAl 2 O 6 , Ba 5 Ca 7 Al 8 O 24 , Ba 3 Ca 3 Al 2 O 12 , Ba 2 Ca 5 Al 2 O 10 , BaCaAl 2 O 5 , and Ba 2 CaAl 2 O 6 .
11. The method of claim 7 wherein aluminum oxide in the barium calcium aluminum oxide is partially or fully replaced with boron oxide.