Investigation of dispersed iron alloy catalysts in the carbon monoxide-hydrogen synthesis reaction. Progress report, August 1, 1979-July 31, 1980

Technical Report · Tue Apr 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5350917· OSTI ID:5350917

Butt, J. B.; Schwartz, L. H.

A series of Fe-Ni, Fe-Co, Fe-Cu and Fe-K catalysts supported on SiO/sub 2/ have been prepared, characterized, and investigated with respect to activity and selectivity in CO-H/sub 2/ synthesis. In addition, several silica supported iron nitrides have been prepared and characterized. During the period encompassed by this report, our catalyst characterization activities have been directed toward the identification of the particle sizes and phases formed upon preparation, calcination, reduction and carburization. We have employed a combination of methods in doing these characterizations: transmission electron microscopy, x-ray diffraction, Moessbauer spectroscopy and temperature programmed oxidation-reduction. Study of the activity and selectivity of the catalyst series has been carried out in a differential reactor system in the range of 225 to 300/sup 0/C with 3H:CO stoichiometry. We have also been developing a hydrogen uptake procedure for determining exposed surface in supported iron catalysts. It has been found that the conditions of preparation strongly affect the nature of the resulting catalyst, both with respect to alloy homogeneity, metal particle size, and catalytic activity. For the Fe system in particular, standard methods of preparation via impregnation and calcination result in very large particle (ca.80 nm) composites of smaller individual grains (ca.10 nm). characterization via x-ray or Moessbauer, however, reveals only the characteristic dimension of the granules and not of the composite particles.

• Research Organization: Northwestern Univ., Evanston, IL (USA)
• DOE Contract Number: AC02-78ER04993
• OSTI ID: 5350917
• Report Number(s): COO-4993-2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CALCINATION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBURIZATION
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT ALLOYS
COPPER ALLOYS
CRYOGENIC FLUIDS
DECOMPOSITION
ELEMENTS
FLUIDS
HARDENING
HYDROGEN
IRON ALLOYS
IRON COMPOUNDS
IRON NITRIDES
NICKEL ALLOYS
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHASE STUDIES
PNICTIDES
POTASSIUM ALLOYS
PYROLYSIS
REDUCTION
RESEARCH PROGRAMS
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SURFACE HARDENING
SURFACE TREATMENTS
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS