Activity and mechanism of the catalytic action of rare-earth oxides in low-temperature ethylene hydrogenation
Journal Article
·
· J. Catal.; (United States)
The variation in catalytic activity of rare-earth oxides and their analogs, scandia and yttria, in ethylene hydrogenation between -120 and 20/sup 0/C has been studied as a function of the temperature of pretreatment. Thermal analysis has been used to study the decomposition of the hydroxides from which the oxides were prepared. The oxides show catalytic activity after pretreatment at 600/sup 0/C when dehydration, decarboxylation, and denitroxylation have gone to completion and, in addition, when partial dehydroxylation of the surface has also taken place. Sesquioxides showed high activity, whereas dioxides were of low activity. A decrease in hydrogenating activity in the series of oxides from lanthana to lutecia correlates with a decrease in their basicity. As was shown by means of thermodesorption, hydrogen and ethylene are chemisorbed in two forms. With dysprosia it has been shown, by using deuterated species, that ethylene hydrogenation proceeds by involving loosely bound forms of hydrogen and ethylene via a semihydrogenated complex. Associatively adsorbed ethylene is involved in the reaction, and hydrogen activation is likely to be the limiting step.
- Research Organization:
- Zelinsky Inst. of Organic Chemistry, Moscow
- OSTI ID:
- 5457025
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 49:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400* -- Petroleum-- Processing
ALKENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ERBIUM COMPOUNDS
ERBIUM OXIDES
ETHYLENE
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
HYDROCARBONS
HYDROGENATION
KINETICS
LUTETIUM COMPOUNDS
LUTETIUM OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SCANDIUM COMPOUNDS
SCANDIUM OXIDES
TEMPERATURE DEPENDENCE
THULIUM COMPOUNDS
THULIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTERBIUM COMPOUNDS
YTTERBIUM OXIDES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
020400* -- Petroleum-- Processing
ALKENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ERBIUM COMPOUNDS
ERBIUM OXIDES
ETHYLENE
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HOLMIUM COMPOUNDS
HOLMIUM OXIDES
HYDROCARBONS
HYDROGENATION
KINETICS
LUTETIUM COMPOUNDS
LUTETIUM OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SCANDIUM COMPOUNDS
SCANDIUM OXIDES
TEMPERATURE DEPENDENCE
THULIUM COMPOUNDS
THULIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTERBIUM COMPOUNDS
YTTERBIUM OXIDES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES