Acyclic aza-containing ligands for use as catalytic carbon capture systems
According to one embodiment, a catalyst includes a metal ion, and an acyclic ligand having at least one aza-containing moiety, where the ligand is complexed to the metal ion.
1. A catalyst, comprising:
a metal ion; and
an acyclic ligand having at least one aza-containing moiety and at least one m-membered heterocyclic amine moiety, wherein m is from 3 to 6,
wherein the ligand is complexed to the metal ion.
2. A catalyst, comprising:
a metal ion; and
an acyclic ligand having at least one aza-containing moiety,
wherein the ligand is complexed to the metal ion,
wherein the metal ion is a zinc ion.
3. The catalyst of claim 1 , wherein the metal ion is an ion of a metal selected from a group consisting of: Zn, Cu, Co and Ni.
4. A catalyst, comprising:
a metal ion; and
an acyclic ligand having at least one aza-containing moiety,
wherein the ligand is complexed to the metal ion,
wherein the acyclic ligand has the formula
wherein a is 0 to 1,
wherein each R group independently comprises a moiety selected from the group consisting of a hydrogen and a C 1-10 alkyl,
wherein each R′ group independently comprises a heterocyclic moiety, wherein at least one of the R′ groups comprises a heterocyclic amine moiety.
5. The catalyst of claim 4 , wherein at least one of the R groups is a methyl.
6. The catalyst of claim 4 , wherein at least one R′ groups is an m-membered heterocyclic amine moiety, wherein m is from 3 to 6.
7. The catalyst of claim 4 , wherein at least one of the R′ groups is a heteroaromatic moiety.
8. The catalyst of claim 7 , wherein the heteroaromatic moiety is selected from a group consisting of: a pyrrole, a pyrroline, an imidazole, a thiazole, an oxazole, and a triazole.
9. The catalyst of claim 1 , wherein the catalyst exhibits a catalytic activity for conversion of CO 2 into bicarbonate about equal to or greater than a zinc cyclen catalyst.
10. The catalyst of claim 4 , wherein the system exhibits a catalytic activity for conversion of CO 2 into bicarbonate greater than a zinc cyclen catalyst under otherwise identical conditions.
11. The catalyst of claim 4 , wherein the catalyst exhibits a catalytic activity of about 80,000 mol −1 s −1 for the conversion of CO 2 into bicarbonate at about 75° C.
12. The catalyst of claim 1 , wherein the catalyst is characterized as exhibiting a greater catalytic activity in hydration of CO 2 than a zinc cyclen catalyst having a formula:
under otherwise identical conditions.
13. A method of making the catalyst of claim 1 , comprising:
providing a first compound having at least two amine moieties;
providing a second compound having a carbonyl moiety;
reacting the first and second compound to form a third compound;
reducing carbonyl groups present in the third compound to form the ligand; and
coupling the metal ion to the ligand.
14. The method of claim 13 , wherein the first compound has the formula
wherein n is 0 or 1, and wherein R independently comprises a moiety selected from the group consisting of a hydrogen and a C 1-10 alkyl.
15. The method of claim 13 , wherein the second compound has the formula
wherein R′ is a heterocyclic amine moiety and R″ is H or OH.
16. A method of depolymerizing amorphous silica, comprising using the catalyst of claim 1 .
17. A method of hydrolyzing ester compounds using the catalyst of claim 1 .
18. A method for capturing CO 2 , comprising:
contacting the catalyst of claim 1 with a gas comprising CO 2 to at least partially remove CO 2 from the gas.
19. The method of claim 18 , further comprising liberating the CO 2 after the contacting, wherein the liberating comprises heating the catalyst.
20. The catalyst of claim 1 , wherein the heterocyclic amine moiety is a heteroaromatic moiety.