Reactions of alkenes on lanthana
Journal Article
·
· J. Catal.; (United States)
Reactions of ethene, propene, butenes, 2-methylpropene, cyclopentene, 2,3-dimethylbut-1-ene, and 3,3-dimethylbut-1-ene have been studied with hydrogen, and sometimes deuterium, on lanthana catalysts. Many alkene/lanthana systems show evidence of self-poisoning which is more marked with straight-chain hydrocarbons than with branched hydrocarbons and at higher temperatures; the catalysts are also highly sensitive to impurities. The temperature required to attain a fixed rate of hydrogenation (10/sup 16/ molecules s/sup -1/ m/sup -2/) varied from 220 K for ethene to over 373 K for the 2,3-dimethylbutenes. Fast hydrogenation without accompanying deuterium exchange was observed with alkenes which cannot form allylic species. The ability to form such species led to rapid isomerization of the butenes below 273 K and of 2-3-dimethylbut-1-ene at 373 K, and to exchange rates with deuterium which were comparable to (propene) or faster than (2-methylpropene) addition reactions at 380 K. Deuterium NMR spectroscopy was used for analysis of the products from the reactions with deuterium. Although the hydrogenation of 3,3-dimethylbut-1-ene occurred readily at 245 K, no isomerization was detected even at 510 K.
- Research Organization:
- Univ. of Edinburgh, Scotland
- OSTI ID:
- 5393965
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 105:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Isomerization of 3,3-dimethyl-1-butene, 3-methyl-1-cyclopentene, and methylenecyclopentane over. gamma. -alumina
Absorption spectra of contact-charge-transfer bans and photochemical reactions of simple alkenes in the cryogenic oxygen matrix
Skeletal isomerization of 3,3-dimethylbut-1-ene on OH-free alumina
Journal Article
·
Thu Jan 31 23:00:00 EST 1980
· J. Catal.; (United States)
·
OSTI ID:6199818
Absorption spectra of contact-charge-transfer bans and photochemical reactions of simple alkenes in the cryogenic oxygen matrix
Journal Article
·
Wed Mar 11 23:00:00 EST 1987
· J. Phys. Chem.; (United States)
·
OSTI ID:6807395
Skeletal isomerization of 3,3-dimethylbut-1-ene on OH-free alumina
Journal Article
·
Fri Jul 01 00:00:00 EDT 1983
· J. Catal.; (United States)
·
OSTI ID:5105310
Related Subjects
02 PETROLEUM
020400* -- Petroleum-- Processing
ALKENES
BUTENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CYCLOALKENES
DEUTERATION
DEUTERIUM
ELEMENTS
ETHYLENE
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
HYDROGENATION
ISOMERIZATION
ISOTOPES
ISOTOPIC EXCHANGE
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LIGHT NUCLEI
MAGNETIC RESONANCE
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POISONING
PROPYLENE
RARE EARTH COMPOUNDS
REACTION INTERMEDIATES
RESONANCE
STABLE ISOTOPES
TEMPERATURE EFFECTS
020400* -- Petroleum-- Processing
ALKENES
BUTENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CYCLOALKENES
DEUTERATION
DEUTERIUM
ELEMENTS
ETHYLENE
HYDROCARBONS
HYDROGEN
HYDROGEN ISOTOPES
HYDROGENATION
ISOMERIZATION
ISOTOPES
ISOTOPIC EXCHANGE
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LIGHT NUCLEI
MAGNETIC RESONANCE
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POISONING
PROPYLENE
RARE EARTH COMPOUNDS
REACTION INTERMEDIATES
RESONANCE
STABLE ISOTOPES
TEMPERATURE EFFECTS