Decomposition of N-butane on alkaline-earth mordenites
The activity of H-mordenite and of partially exchanged Ca-H, Mg-H, and Ba-H mordenites for n-butane decomposition at 400/sup 0/-600/sup 0/C was correlated to the catalyst acidity as detected by IR spectroscopy of adsorbed pyridine. The mordenite acidity was varied by pretreating at 400/sup 0/-700/sup 0/C in vacuum. The results showed that the cation-exchanged mordenites were less active than the decationated form, that the activity decreased in the order Ba Vertical Bar3: Ca Vertical Bar3: Mg, and that the cation had no effect on the relative yields of isomerization, dehydrogenation, and cracking products. With increasing pretreatment temperature, the activity had a maximum at 500/sup 0/C, which corresponded to a maximum pyridinium ion concentration. The results suggested that the reaction proceeded on Broensted sites, that only a fraction of the Broensted sites were involved, and that an inductive effect of adjacent Lewis acid sites, which increased the Broensted acid strength, was necessary for the reaction.
- Research Organization:
- Inst. Catal. Petroquim., Cons. Super., Invest. Cient., Madrid
- OSTI ID:
- 7138649
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 54:3; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
ADSORPTION
ALKANES
AZINES
BUTANE
CATALYTIC EFFECTS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
HYDROCARBONS
INFRARED SPECTRA
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
MORDENITE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINE
PYRIDINES
SILICATE MINERALS
SORPTION
SORPTIVE PROPERTIES
SPECTRA
SURFACE PROPERTIES
YIELDS
ZEOLITES