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CAER Seminars

MODIFIED IRON OXIDES: CATALYSTS FOR ACID-CATALYZED REACTIONS

Speaker:
Malvina Farcasiu
Springview R & D Corporation
Stony Brook, New York

Date:
Wednesday, November, 18, 1998 3:30 pm
Ben Bandy Conference Center
Center for Applied Energy Research

Abstract:
Data will be presented regarding work performed in the last few years to develop a new class of very stable and active solid acid catalysts. The catalysts are modified iron oxides with an egg-shell structure. The precursors are magnetites doped with small amounts of metals with radius and electrical charge compatible with Fe3+ or Fe2+. Among them are: Cu2+, Zn2+, Co2+, Al3+, Ga3+, V3+. Active acid-catalysts are formed when the percursors are heat-treated in the presence of halogenated hydrocarbons.

During activation the dopant metal ions diffuse to the surface of the iron oxide particles and interact with metal ions diffuse to the surface of the iron oxide particles and interact with halogen forming a complex catalytic surface containing ions of Fe3+, Fe2+, dopant metal(s), halogen, and oxygen. The catalysts have been characterized by a large variety of physical methods and by catalytic testing.