Structure of NiO/SiO/sub 2/ catalyst for ethylene dimerization as observed by infrared absorption

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · J. Catal.; (United States)

OSTI ID:6368306

Sohn, J R; Ozaki, A

Two groups of nickel oxide/silica catalysts were tested: for Group 1, a mixture of sodium silicate, nickel sulfate, and sulfuric acid containing a 1:4 ratio of NiO to SiO/sub 2/ was precipitated with sodium hydroxide at pH 6-12.7; in Group 2, the original solutions contained NiO/SiO/sub 2/ ratios of 1:11 to 7:1 and all were precipitated at pH 7.5. In Group 1, after calcination, the nickel oxide content increased and the structure changed from montmorillonite to antigorite as the pH of the preparative solution increased; above pH 11, no free silica was detected. Group 2 catalysts, after calcination at 550/sup 0/C, showed a maximum specific surface area at 34Vertical Bar3< NiO (compared with a maximum at 13Vertical Bar3< for Group 1), and a change of structure from montmorillonite to antigorite at approx. 60Vertical Bar3< NiO. Static activity tests for ethylene dimerization as a function of catalyst evacuation temperatures (room temperature to 650/sup 0/C) showed two dimerization activity peaks for all catalysts, one activated by pretreatment at 100/sup 0/C and attributed to montmorillonite, and the other which was higher and more dependent on nickel oxide content, activated at 550/sup 0/-650/sup 0/C and attributed to antigorite.

• Research Organization: Tokyo Inst. Technol.
• OSTI ID: 6368306
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 59:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020500* -- Petroleum-- Products &amp; By-Products
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
ALKENES
CALCINATION
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
DATA
DECOMPOSITION
DIMERIZATION
ETHYLENE
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
MINERALS
NICKEL COMPOUNDS
NICKEL OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
POLYMERIZATION
PYROLYSIS
QUANTITY RATIO
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS