Effect of thermal treatment on catalytic and surface characteristics of a diluted supported Co/Al/sub 2/O/sub 3/ catalyst

Journal Article · Sat Apr 01 04:00:00 EST 1978 · J. Catal.; (United States)

OSTI ID:5872797

Hassan, S A; Abdel-Khalik, M; Hassan, H A

A very dilute hydrocracking catalyst containing 0.453% by wt cobalt on ..gamma..-alumina was treated for 0.5-6 hr at 350/sup 0/, 400/sup 0/, and 450/sup 0/C in vacuo. The sintered catalysts were studied by surface area and pore structure measurements, hydrogen chemisorption, electron microscopy, and catalytic activity for the model reaction of hydrogen peroxide decomposition. The results show that below 400/sup 0/C, sintering and deactivation occur mainly by surface diffusion, with an activation energy for the sintering process of 14.70 kcal/mole. Activation takes place at 450/sup 0/C as a result of increased migration of supported cobalt atoms on the support surface. Apparently at 450/sup 0/C, the alumina surface with the cobalt behaves as a solid solution with a lowered melting point, which leads to a readjustment of sintering parameters. Graphs, photomicrograph, and 30 references.

• Research Organization: Ain Shams Univ., Cairo, Egypt
• OSTI ID: 5872797
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 52:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COBALT
CRACKING
DECOMPOSITION
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HYDROCRACKING
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
METALS
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
PYROLYSIS
SEPARATION PROCESSES
SINTERING
SORPTION
SURFACE PROPERTIES
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS