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A Study of the Carbon Dioxide-Carbon Reaction by Oxygen Exchange.

PB221756

Publication Date	1973
Personal Author	Mentser, M.; Ergun, S.
Page Count	48
Abstract	The exchange of oxygen between CO2 and CO that occurs reversibly on carbon surfaces was studied at temperatures of 750-850C and a pressure of one atmosphere. Carbon-14 was used to detect and measure the exchange reaction. The extent of oxygen exchange was a linear function of composition of the gas mixture. Equilibrium constants agreed well with values in the literature that were derived only by indirect procedures. This result established the validity of oxygen exchange in the mechanism of carbon gasification by CO2. Rates of carbon gasification were less than an order of magnitude slower than rates of oxygen exchange. The closeness in the activation energies argues against any change in the rate-controlling step over a wide temperature span at atmospheric pressure. The role of CO as a retardant on the CO2-C reaction, and the nature of the carbon-oxygen complex are also discussed in view of the data obtained. (Modified author abstract)
Keywords	Carbon dioxide Exchange reactions Carbon monoxide Surface chemistry Oxygen Carbon Chemical equilibrium Reaction kinetics Carbon 14
Source Agency	Invalid Source Agency Code
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Prepared in cooperation with Pittsburgh Energy Research Center, Pa.
Document Type	Technical Report
Title Note	Research rept. 1959-1970.
NTIS Issue Number	197317

A Study of the Carbon Dioxide-Carbon Reaction by Oxygen Exchange.

A Study of the Carbon Dioxide-Carbon Reaction by Oxygen Exchange.
PB221756

Publication Date	1973
Personal Author	Mentser, M.; Ergun, S.
Page Count	48
Abstract	The exchange of oxygen between CO2 and CO that occurs reversibly on carbon surfaces was studied at temperatures of 750-850C and a pressure of one atmosphere. Carbon-14 was used to detect and measure the exchange reaction. The extent of oxygen exchange was a linear function of composition of the gas mixture. Equilibrium constants agreed well with values in the literature that were derived only by indirect procedures. This result established the validity of oxygen exchange in the mechanism of carbon gasification by CO2. Rates of carbon gasification were less than an order of magnitude slower than rates of oxygen exchange. The closeness in the activation energies argues against any change in the rate-controlling step over a wide temperature span at atmospheric pressure. The role of CO as a retardant on the CO2-C reaction, and the nature of the carbon-oxygen complex are also discussed in view of the data obtained. (Modified author abstract)
Keywords	Carbon dioxide Exchange reactions Carbon monoxide Surface chemistry Oxygen Carbon Chemical equilibrium Reaction kinetics Carbon 14
Source Agency	Invalid Source Agency Code
NTIS Subject Category	99F - Physical & Theoretical Chemistry
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Supplemental Notes	Prepared in cooperation with Pittsburgh Energy Research Center, Pa.
Document Type	Technical Report
Title Note	Research rept. 1959-1970.
NTIS Issue Number	197317