Waste gases are heated in the presence of special CTP oxidation catalysts which are responsible for the high cleaning efficiency and outstanding cost-effectiveness of the recuperative catalytic oxidation (CO). Low reaction temperature achievable with catalysts and the outstanding thermal efficiency of the regenerative thermal oxidation (RTO) are the benefits of the regenerative catalytic oxidation (RCO). Further CTP has developed recuperative as well as regenerative selective catalytic reduction system solutions (SCR). The SCR technology converts NOx with a reduction agent to nitrogen and water in the presence of a catalyst. The chemical reaction is selective and this means oxides of nitrogen are preferentially reduced while unwanted side reactions are inhibited.