Catalytic oxidation - removing volatile organic compounds
Topsoe's catalytic oxidation process offers a safe and environmentally friendly abatement of volatile organic compounds, VOCs, from off-gasses in a very cost-efficient operation. By lowering the required oxidation temperature to 200-400°C compared to typically 800-900°C in thermal oxidisers, the use of support fuel is reduced or even eliminated.
Depending on the VOC concentration Topsoe offers catalysts for two oxidation technologies:
- CATOX for air with medium to high concentration of VOCs - 2-10 g/Nm3
- REGENOX for air with low to medium concentration of VOCs - 0.3-4 g/Nm3
The CATOX process uses an indirect gas-gas heat exchanger to achieve the required temperature for the catalytic oxidation to occur. Depending on the concentration of VOCs, a support heater may be required.
The REGENOX process uses one or more beds of heat absorbing material for regenerative heat exchange and is able to operate without support heat at lower VOC concentrations than the CATOX process.
Both CATOX and REGENOX units are easily designed for a purification grade of 99% or higher.
Oxidation catalyst applications
Topsoe's CK-series of oxidation catalysts are suitable for treating off-gases to remove noxious and malodorous compounds from a wide range of different industries and applications, e.g:
- chemical and pharmaceutical industries
- food industry
- printing and coating industry
- paint and varnish shops
- the power industry
- metal processing industry
- purified terephtalic acid, PTA, plants
Catalytic oxidation – CO abatement
Topsøe’s DNO series of advanced oxidation catalysts combine the results of Topsøe’s vast experience within catalytic oxidation and within catalytic NOx reduction.
The DNO catalysts are specifically designed for abatement of carbon monoxide. They are prepared from a DNX® SCR catalyst base which is impregnated with an additional active component in the form of palladium. The synergy of vanadium and tungsten oxides and palladium provides the DNO catalysts with a uniquely high oxidation activity. The highly porous DNX® base combined with deep-impregnation of palladium furnishes the DNO catalysts with an unsurpassed stability, also when operating in sulphur- and chlorine-containing gases, e.g. flue gas from biomass-fired boilers or landfill- and digester gas.