Method for making nitrogen aromatic oligomers and polymers
View Patent ↗Methods for synthesizing dimeric or higher polymeric reaction products of nitrogen aromatics comprise contacting a composition comprising the nitrogen aromatic with a catalyst composition. The catalyst is in particulate form and comprises a first metal substrate having a second reduced metal coated on the substrate.
1. A method for synthesizing dimeric or higher polymeric reaction products of nitrogen aromatics, comprising: contacting a composition comprising the nitrogen aromatic with a catalyst composition, wherein the nitrogen aromatic composition comprises a compound or a mixture of compounds represented by the structure
wherein
X is —N— or —CR 2 —;
R 1 , R 2 , and R 3 are independently selected from the group consisting of hydrogen or alkyl, aryl, heterocyclyl, heteroaryl, or cycloalkyl groups containing 1 to 20 carbons; and
wherein the catalyst composition is in particulate form and comprises a first metal substrate having a second reduced metal coated on the substrate, wherein the first metal is selected from the group consisting of Mg, V, Cr, Zn, Al, Li, Na, K, Be, Ca, Sr, Ba, Ti, Si, and alloys thereof; and the second metal is selected from the group consisting of Ni, Co, Cu, Ti, V, Re, Ru, Rh, Ir, Pd, Pt, Ag, Au, and alloys thereof.
2. A method according to claim 1 , wherein the reaction product comprises 2,6-polymerization products.
3. A method according to claim 1 , wherein the reaction product comprises a homopolymer.
4. A method according to claim 1 , wherein the reaction product comprises a copolymer.
5. A method according to claim 4 , wherein the reaction product contains greater than 50 mole % pyridine.
6. A method according to claim 4 , wherein the reaction product comprises greater than 90 mole % pyridine and less than 10 mole % of nitrogen aromatics wherein at least one of R 1 , R 2 , and R 3 contains 6 carbons or more.
7. A method according to claim 1 , wherein the first metal substrate comprises Mg or alloys thereof.
8. A method according to claim 1 , wherein the first metal substrate comprises magnesium or alloys thereof and the second reduced metal coated on the substrate comprises Ni, Co, Cu, or alloys thereof.
9. A method for producing dimeric nitrogen aromatic products comprising:
a) contacting a composition comprising a nitrogen aromatic with a catalyst composition; and
b) reacting for a time sufficient to favor formation of a dimeric product over a polymeric product,
wherein the nitrogen aromatic comprises a compound or compounds represented by the structure
wherein
X is —N— or —CR 2 —; and
R 2 and R 3 are independently selected from the group consisting of hydrogen and alkyl, aryl, heterocyclyl, heteroaryl, or cycloalkyl groups containing 1 to 20 carbons; and the catalyst composition is in particulate form and comprises a first metal substrate having a second reduced metal coated on the substrate, wherein the first metal is selected from the group consisting of Mg, V, Cr, Zn, Al, Li, Na, K, Be, Ca, Sr, Ba, Ti, Si; and alloys thereof, and the second metal is selected from the group consisting of Ni, Co, Cu, Ti, V, Re, Ru, Rh, Ir, Pd, Pt, Ag, Au, and alloys thereof.
10. A method according to claim 9 , wherein the nitrogen aromatic compound comprises pyridine and the reaction product comprises 4,4′-bipyridyl.
11. A method according to claim 9 , wherein the first metal comprises Mg or alloys thereof.
12. A method according to claim 9 , wherein the first metal comprises Mg or alloys thereof and the second metal comprises Ni, Co, Cu, or alloys thereof.