Studies of ethylene hydrogenation and of adsorbed C/sub 2/H/sub 4/ and H/sub 2/ on chromia and lanthana catalysts

Journal Article · Tue Jan 01 04:00:00 EST 1980 · J. Catal.; (United States)

OSTI ID:6229509

Khodakov, Y S; Makarov, P A; Delzer, G; Minachev, K M

Temperature-programed desorption of ethylene or hydrogen adsorbed at -78/sup 0/, -68/sup 0/, and +20/sup 0/C on chromic oxide, a 1:7 chromic oxide/alumina catalyst prepared by impregnation, alumina, and lanthanum oxide pretreated at 400/sup 0/-900/sup 0/C in vacuo showed that ethylene adsorbed on these oxides on three different sites from which it desorbed at -40/sup 0/ to +10/sup 0/C, at 50/sup 0/-100/sup 0/C, and at 350/sup 0/-400/sup 0/C; and that hydrogen adsorbed only on the latter two sites. One preadsorbed ethylene molecule was displaced at room temperature by 16 molecules of carbon monoxide, 79 molecules of carbon dioxide, or 135 molecules of water. Hydrogen was displaced at lower temperature. The nature of the surface sites and of the adsorbed species, and their reactivities are discussed.

• Research Organization: Inst. Org. Chem., Acad. Sci. USSR
• OSTI ID: 6229509
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 61:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
DATA
DESORPTION
ELEMENTS
ETHYLENE
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFORMATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SORPTION
SURFACE PROPERTIES
SYNTHESIS
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS