Actions for Studies of fundamental factors controlling catalyzation of reactions of gases with carbonaceous solids. First progress report

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Studies of fundamental factors controlling catalyzation of reactions of gases with carbonaceous solids. First progress report

Author
Fisher, R. M.
Published
United States : [publisher not identified], 1977.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1977.
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Mahoney, J. V., Schwerer, F. C., Shirley, C. G., and Szirmae, A.

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Summary
Flakes of natural graphite exposed to various H/sub 2/-H/sub 2/O-He atmospheres at temperatures from 650 to 1100/sup 0/C after deposition of small particles of iron have been examined in the SEM and MVEM. The characteristics of surface channels resulting from iron-catalyzed reactions producing CO and/or CH/sub 4/ appear to depend on temperature and to a lesser extent on P/sub H/sub 2/O/ level. Very narrow, parallel-sided channels catalyzed by small iron particles, initiated at ledge steps on the cleaved graphite, take on (11 anti 2 0) directions at low temperatures and in moist atmospheres, whereas at high temperatures broad wavy tracks result from movement of large particles. Very broad reaction zones are wetted by an unknown iron-silicon phase forming thin ribbons of what appear to be single crystals on samples heated in dry H/sub 2/ at 1100/sup 0/C. Simple models of iron-catalyzed channeling reactions have been examined on the basis of heat balance, gas diffusion, surface migration and other considerations to define limiting conditions and suggest new experimental observations.
Report Numbers
COO-2933-1
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: EY-76-C-02-2933
OSTI Identifier 7214589
Research organization: United States Steel Corp., Monroeville, PA. Research Lab.
View MARC record | catkey: 44280907