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US 5,686,613 AGranted
Tridentate metal ligands of certain pyridine phosphonic acids
AssigneeWheelabrator Clean Air Systems Inc.
InventorsDerek McManus, Arthur E. Martell, Dian Chen
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Abstract
Novel pyridine phosphonate ligands are disclosed that when combined with polyvalent metals results in useful catalyst compositions for the conversion of hydrogen sulfide to solid sulfur. Catalysts containing these novel ligands exhibit resistance to metal precipitation and demonstrate little or no oxidative chemical degradation when employed to convert hydrogen sulfide to elemental sulfur.
Claims6
A metal chelate composition having the following formula:
- ML.sub.2 where,
- (a) L has the following formula:
- ##STR4## (b) R is COOH or PO(OH).sub.2 ;
- (c) R.sub.1, R.sub.2 and R.sub.3 are each selected independently from the group consisting of H, OH, alkyl containing 1 through 3 carbon atoms, NO.sub.2, SO.sub.3 H, Cl, Br, F, and CN;
- and
- (d) M is a polyvalent metal that exists in more than one oxidation state.
3 more elements
A metal chelate composition having the following formula:
- ML where,
- (a) L has the following formula:
- ##STR5## (b) R is COOH or PO(OH).sub.2 ;
- (c) R.sub.1, R.sub.2 and R.sub.3 are each selected independently from the group consisting of H, OH, alkyl containing 1 through 3 carbon atoms, NO.sub.2, SO.sub.3 H, Cl, Br, F, and CN;
- and
- (d) M is a polyvalent metal that exists in more than one oxidation state.
3 more elements
Dependencies are inferred from the claim text.