Catalytic oxidation of carbon monoxide on lanthanum cobalt oxide and its strontium doped derivatives
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"In the last few years the quest for stable and active catalyst for the treatment of automotive exhaust and for electrocatalytic fuel cell has stimulated wide interest in rare earth perovskite compounds (1). Lanthanum cobalt oxide, LaCo0g3, as a member of this class of compounds has received particular attention due to its distinct structural, electronic and catalytic properties. Katzman et al. (2) has reported the use of LaCo03, as an inexpensive and really promising auto exhaust oxidation catalyst which can withstand tetracethyl lead and ethylene dibromide poisoning. It has also been reported (3) that strontium doped LaCo0g3 (La0.8Sr0.2Co03) rivaled platinum as an oxygen electrode and that La0.5Sr0.5Co03 performs as a nearly ideal reversible electrode in a 45% KOH aqueous electrolyte at 20°C (4). Pederson and Libby (5) have reported that use of LaCoO3 as a good catalyst for hydrogenolysis and more recent studies (1) have investigated the possibility of tailoring the catalytic properties of these systems on the basis of their known solid state properties. The most interesting of these experimental reports was Kuo's (6) report on emission of visible light during catalytic oxidation of carbon monoxide and oxygen on LaCo03 and its strontium doped derivatives. From this report it was envisioned that if the light emission could be confirmed and proved to be a function of the reaction rate, it is conceivable that at controlled high reaction rates, strong chemiluminescence could be produced to provide an inexpensive high intensity laser. From these ideas the major emphasis of the thesis originally, was to investigate the chemiluminescence and catalytic properties of LaCo03 and its strontium doped derivatives, La1-xSrsCo03. The electronic structure of the compound was investigated to establish probable explanations of the observed catalytic properties. However, it was subsequently observed that no luminescence can be identified during reaction and no observable conversion occurred at the reported temperatures (6). From these observations, the major objective of this research was redirected toward the possible identification and explanations of the opposing reports."--Introduction.
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