Experimental study of reaction instability and oscillatory behavior during CO oxidation over Pd supported on glass fiber catalysts
The catalytic ignition-extinction limits and oscillatory behavior of the CO oxidn. at atm. pressure over Pd supported on glass fibers were investigated as a function of catalyst sp. surface area, surface concn. and dispersion of Pd. The ignition-extinction limits for each specific catalyst depend on the CO concn. and the gas flow rate. Three reactivity regions were found as a function of temp. and CO concn.: high reactivity region with conversion close to 100%, low reactivity region and the region of multiplicity of steady states. In the region of multiplicity the self-sustained oscillations with a period up to 6 h were obsd. for the catalyst with Pd loading of 0.2%wt. High and low reactivity states of the catalyst were assocd. with reduced and oxidized state of Pd on the glass fiber surface. It is believed that the reaction rate oscillations are due to the cycles of Pd partial oxidn.-redn. [on SciFinder (R)]
WOS:000081204500021
1999
Amsterdam
191
198
Studies in Surface Science and Catalysis; 122
CAN 130:357680 67-3 Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms Institute of Chemical Engineering, EPFL,Lausanne,Switz. Journal 0167-2991 written in English. 7440-05-3 (Palladium) Role: CAT (Catalyst use), PRP (Properties), USES (Uses) (exptl. study of reaction instability and oscillatory behavior during CO oxidn. over Pd supported on glass fiber catalysts); 630-08-0 (Carbon monoxide) Role: PEP (Physical, engineering or chemical process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or reagent) (exptl. study of reaction instability and oscillatory behavior during CO oxidn. over Pd supported on glass fiber catalysts)