Acidity of nickel silicate and its bearing on the catalytic activity for ethylene dimerization and butene isomerization
Experimental results obtained with nickel silicate catalysts precipitated at pH 6-10 (Group 1) or containing 4-90% nickel oxide (Group 2) provided evidence that 1-butene was the primary product of ethylene dimerization; that 2-butene was a secondary isomerization product; that the selectivity for 2-butene isomerization ran parallel to the previously measured dimerization activity, i.e., had maxima at 100/sup 0/ and 600/sup 0/C pretreatment temperatures; that the montmorillonite sites which were activated at 100/sup 0/C consisted of protonic acid sites; that the protonic sites for dimerization and isomerization differed and that the number of isomerization sites was about one order of magnitude greater than that of dimerization sites; and that the antigorite sites activated at 600/sup 0/C were nonprotonic acid sites. The experiments included n-butylamine titration with dicinnamalacetone indicator, ammonia chemisorption, selective poisoning studies with water and sodium, deuterium tracer studies, and IR spectroscopy.
- Research Organization:
- Tokyo Inst. of Technol.
- OSTI ID:
- 6360648
- Journal Information:
- J. Catal.; (United States), Vol. 61:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BUTENES
ISOMERIZATION
CATALYSTS
ETHYLENE
DIMERIZATION
NICKEL SILICATES
CATALYTIC EFFECTS
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
NICKEL OXIDES
PH VALUE
STRUCTURAL CHEMICAL ANALYSIS
SURFACES
ALKENES
CHALCOGENIDES
CHEMICAL REACTIONS
HYDROCARBONS
KINETICS
NICKEL COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
REACTION KINETICS
SILICATES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
400201 - Chemical & Physicochemical Properties