Catalytic destruction of ozone at room temperature

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:351069

Singh, N; Pisarczyk, K S; Sigmund, J J ^[1]

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1. Carus Chemical Co., LaSalle, IL (United States)

Ozone is a toxic gas and even in low concentrations it can adversely affect the health of humans, animals, and negatively effect the yields of crops. Ozone in the work environment causes serious health problems, corrodes most metals, causes rubber to crack, deteriorates textile fibers and damages most plastics. The Occupational Safety and Health Administration (OSHA) require that the indoor Threshold Limit Value (TLV) of an eight hour exposure to ozone be reduced to 0.1 ppm. The toxicity of ozone is a major concern and, thus, the USEPA typically requires the ozone to be controlled to specified levels. Ozone is also produced in many applications where the corona treaters are used in printing and copying operations. The off gas from these applications must be treated to meet USEPA standards. Catalysts accelerate the decomposition of ozone into molecular oxygen. Manganese dioxide based catalysts provide the high ozone destruction efficiencies at ambient temperatures whereas other commercially available catalysts and thermal technologies require higher temperatures. The manganese dioxide based catalysts provide ozone destruction efficiency of greater than 99.9% at an ambient temperature and are able to effectively perform in high humidity applications. These catalysts can be used in extruded, granular or powder forms depending upon the application. The performance characteristics, measured as ozone destruction efficiency of these catalysts is dependent upon the operating conditions of the catalytic reactor. Reactor configuration and operating conditions; such as, gas phase linear velocity, contact time, temperature, relative humidity, and inlet ozone concentration of the gas stream, all influence the efficiency of these catalytic systems. A model relating the ozone destruction efficiency of a catalyst, as it is affected by these parameters, will be presented.

• OSTI ID: 351069
• Report Number(s): CONF-970677--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
AIR POLLUTION ABATEMENT
CATALYSTS
EFFICIENCY
INDUSTRIAL WASTES
MANGANESE OXIDES
MATHEMATICAL MODELS
OZONE
WASTE PROCESSING