Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Catalysis and surface chemistry--2. Reactions of propylene over reduced molybdena-alumina catalysts

Conference · · J. Catal.; (United States)
OSTI ID:6320244
The effects of eight different poisons on the isomerization of cyclopropane to propylene, the metathesis of propylene to ethylene and butenes, the hydrogenation of C/sub 2/-C/sub 4/ alkenes, and propylene-deuterium exchange was studied over alumina-supported 8% molybdenum trioxide, a potential coal hydrogenation catalyst. The tests were conducted in a circulation and a microcatalytic pulse system with catalysts that were reduced to various extents. The results showed that the studied reactions occurred only on a small fraction of the surface; that CO and NO were effective poisons for hydrogenation and exchange; that CO also partially poisoned isomerization; that H/sub 2/O, pyridine, and NH/sub 3/ poisoned all reactions; that CO/sub 2/ and N/sub 2/O did not poison any reaction; and that O/sub 2/ poisoned hydrogenation by reoxidizing reduced surface sites. The adsorption of NO and CO, and the hydrogenation and exchange reactions corresponded to the extent of reduction and vacancy concentration. Methathesis was nearly independent of degree of reduction. Therefore, the previously postulated common adsorbed alkyl intermediate on a coordinatively unsaturated molybdenum ion could not be confirmed.
Research Organization:
Univ. of Wisconsin-Milwaukee
OSTI ID:
6320244
Report Number(s):
CONF-780601-
Conference Information:
Journal Name: J. Catal.; (United States) Journal Volume: 64:1
Country of Publication:
United States
Language:
English