TITLE: Heterobimetallic Complexes for CO Reduction: Final Report, March 1,1985-January 31, 1989.

AUTHOR: J. K. Stille.

INST.  AUTHOR: Colorado State Univ., Fort Collins. Dept. of Chemistry.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1 Feb 89,  48p.

NTIS ORDER NO.: DE89011586/INW

ABSTRACT:

The goal of this research was to synthesize certain homogeneous heterobimetallic catalysts, containing both an early and a late transition metal, that would reduce carbon monoxide selectively under mild reaction conditions. Because there are a number of examples of heterogeneous catalysts which are mixed metal oxides or mixed alloy catalysts that reduce carbon monoxide under relatively mild conditions more selectively than a catalyst composed only of one metal, heterobimetallic catalyst synthesis was emphasized. Complexes containing combinations of early (Mo, W) and late (Co, Fe, Ru) transition metals that could be expected to activate carbon monoxide most effectively were primary targets. The late transition metals were selected because they are the most efficient in heterogeneous catalysts used in Fischer-Tropsch and other carbon monoxide reductions. As models for reactions occurring in the reduction of CO, some key reactions of certain dinuclear palladium complexes were observed. The reaction of the dimer containing a hydride and a methyl on adjacent palladiums with CO gives an acyl complex that eliminates acetaldehyde. Iron-tungsten complexes bridged by a phosphino cyclopentadienyl ligand, and containing hydride and carbonyl were prepared. A new method of synthesizing homo- and heterodinuclear complexes containing two bridging cyclopentadienyl ligands was developed. 82 refs. (ERA citation 14:028960)

REPORT  NUMBER: DOE/ER/13340-4

CONTRACT  NUMBER: FG02-85ER13340