TITLE: New Approach to the Generation of Metal-Bearing, Medium-Pore, Shape-Selective Zeolites for Fischer-Tropsch Catalysis. Spectroscopic Studies of Zeolites.

AUTHOR: L. E. Iton;   R. B. Beal;   D. T. Hodul.

INST.  AUTHOR: Argonne National Lab., IL.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  1983,  53p.

NOTES: International symposium on relations between hemogeneous and heterogeneous catalysis, Asilomar, CA, USA, 2 Oct 1983.

ABSTRACT:

Two recent developments in zeolite synthesis and modification were successfully combined to demonstrate a new approach to the generation of metal-bearing, medium-pore, shape-selective zeolites for use as catalysts in Fischer-Tropsch conversions. The steps are: (1) synthesis of an aluminoferrisilicate zeolite having the ZSM-5-type structure; (2) removal of the organic base template incorporated in the channel system during synthesis; (3) formation of a polycyano inclusion compound in the AFS zeolite; and (4) reduction of the inclusion compound by hydrogen at approx. 400 exp 0 C. PAS and EPR spectroscopy have been used to establish that the as-synthesized AFS zeolite contains Fe exp 3+ ions in both framework and non-framework sites. FMR spectroscopy has been used to confirm the formation of the metallic (Fe) and bimetallic (Fe/Ru and Fe/Co) particles as products of the reduction of the inclusion compounds by hydrogen. The application of other spectroscopic techniques in recent studies of cations, complexes, and metal particles in zeolites is reviewed: high-resolution solid-state NMR, nuclear-spin-relaxation studies, FMR, EXAFS, and XANES. (ERA citation 08:050834)

REPORT  NUMBER: CONF-8310120-1

CONTRACT  NUMBER: W-31-109-ENG-38