Catalytic Oxidation of Carbon Monoxide at High Humidity and Low Temperature

摘要

Two catalysts (hopcalite and palladium) were tested for efficiency in promoting oxidation of carbon monoxide (CO). The catalysts were tested using air at 21 000 per h to the minus 1 space velocity, 50% relative humidity, and various temperatures. The air was contaminated with approximately 100 ppm each of methane, dichlorofluoromethane (R-12), and dichlorotetrafluoroethane (R-114) in addition to approximately 5000 ppm of CO. Hopcalite was further tested under similar conditions except that the air was at 100% relative humidity. There is little difference in the efficiencies of hopcalite and palladium catalyst for oxidizing CO at 57 to 62 C; both are low. At 119 to 122 C, the palladium is more efficient than hopcalite. The simultaneous presence of three other contaminants decreased the efficiency of both hopcalite and palladium for oxidizing CO. With the hopcalite preheated to about 119 C, the heat of reaction is not sufficient to maintain the oxidation of CO under the conditions tested. The minimum temperature at which hopcalite and palladium catalysts will completely oxidize CO under the conditions tested is in the 70 to 100 C range.