Effect of calcination temperature of alumina on the adsorption/impregnation of Pd(II) compounds
- Syracuse Univ., NY (United States)
A series of alumina supports derived from a common source material was subjected to a range of calcination temperatures and the results of this treatment on the adsorption of Pd(II) compounds were studied. Increasing calcination temperature lead to a decrease in BET surface area and produced a series of alumina samples carrying different inventories of hydroxyl groups. The surface chemistry of these hydroxyl groups was studied using mass and potentiometric titration techniques and form these data the protonation/deprotonation equilibrium constants for the surface hydroxyl groups were obtained. This allowed construction of the pH-dependent surface charge distribution for each alumina sample. Cationic and anionic Pd(II) complexes were used to titrate the negative and positive surface charge sites. The authors find that the adsorption mechanism is primarily controlled by electrostatic effects in that saturation capacities of adsorbed complex showed a correlation with the surface charge density evaluated at the pH used for the adsorption/impregnation experiments.
- DOE Contract Number:
- FG02-87ER13650
- OSTI ID:
- 7202861
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 132:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CORRELATIONS
DECOMPOSITION
IMPREGNATION
OXIDES
OXYGEN COMPOUNDS
PALLADIUM COMPOUNDS
PH VALUE
POTENTIALS
PYROLYSIS
SORPTION
SORPTIVE PROPERTIES
SURFACE AREA
SURFACE POTENTIAL
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TITRATION
TRANSITION ELEMENT COMPOUNDS