US 11,697,663 B2 · Metal-ligand catalysts for selective promotion of electrochemical CO2RR

Abstract

The electrochemical carbon dioxide reduction reaction (CO2RR) provides opportunities to synthesize value-added products from this greenhouse gas in a sustainable manner. Efficient catalysts for this reaction are provided that selectively drive CO2 reduction over the thermodynamic and kinetically competitive hydrogen evolution reaction (HER) in organic or aqueous electrolytes. The catalysts are metal-polypyridyl coordination complexes of a redox non-innocent terpyridine-based pentapyridine ligand and a first-row transition metal. The metal-ligand cooperativity in [Fe(tpyPY2Me)]2+ drives the electrochemical reduction of CO2 to CO at low overpotentials with high selectivity for CO2RR (>90%).

Claims6

Dependent claims

A metal coordination complex catalyst, comprising:

(a) a metal;
and
(b) a tpyPY2Me ligand represented by formula (1)
wherein each substituent lettered A to S of said ligand is independently selected from the group of substituents consisting of H, R, a halide, CF3, OR, NR2, and SiR3, where R is an alkyl group or an aryl group.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/164,281Filed 1 Feb 2021 · us provisional application

Priority

31 Jan 2020

Published

US 2021/0238212 A15 Aug 2021

Granted

11 Jul 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

C07F 15/025
Iron compounds: without a metal-carbon linkage
B01J 31/1815
Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine:…
B01J 31/183
Ligands comprising condensed ring systems, e.g. acridine, carbazole: with more than one complexing nitrogen atom, e.g. phenanthroline
C25B 1/23
Products: carbon monoxide or syngas

Metal-ligand catalysts for selective promotion of electrochemical CO2RR

Life of this patent

Metal-ligand catalysts for selective promotion of electrochemical CO2RR

Life of this patent

Abstract

Claims6