Oxidation of graphite by low concentrations of water vapor and carbon dioxide in helium

✍ Scribed by L.G. Overholser; J.P. Blakely

• Publisher: Elsevier Science
• Year: 1965
• Tongue: English
• Weight: 865 KB
• Volume: 2
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(65)90009-6

✦ Synopsis

The rates of reaction of a spherical specimen of Speer Moderator-2 graphite with lot< partial pressures of carbon dioxide and water vapor were determined in flowing helium at a totat pressure of 1 atm. The rates were obtained from weight changes of the specimen and from analyses of the effluent gases. The activation energy for the CO,-graphite reaction was determined between 875 and 1025°C at carbon dioxide concentrations of 550 and 1100 vpm. The apparent order of thlreaction was established at 975°C using carbon dioxide concentrations ranging from 60 to 1650 vpm The temperature coefficient of the H,O-graphite reaction was measured at temperatures of 825 to 1025°C using water vapor concentrations of 110 and 460 vpm. The apparent order of this reaction <-'ti established at 975°C in the water vapor concentration range of 20-760 vpm. Thcs retardation of the H,O-graphite reaction hy hydrogen and carbon monoxide additions ~vxs studied. 1. IN~ODU~ION Con) to a zero order at very high oxidant pressures.