Influence of Support Nature on Properties of Co-, In-Oxide Catalysts in Selective Catalytic Reduction by Methane
The problem of catalytic reduction of nitrogen oxides (NOX) in oxidizing atmosphere (SCR-process) in the presence of sulfurous compounds and high humidity remains topical. The work presents results of studies on influence of the support nature (aluminum and zirconium oxides, their binary compositions) on activity of Co- and In-containing catalysts also structured (honeycomb block-structures) in NO SCR by C1-C4-hydrocarbons including in the presence of H2O and SO2. Activity of Co-In-oxide catalysts depends on support nature, quantity and a method of active component application, at that the catalysts (In2O3-CoO)/ZrO2 are characterized by high moisture and sulfur resistance (NO conversion in the SCR by methane reaches 86 % at 300 °C in the presence of H2O). Activity of the structured catalysts depends on both composition of a secondary support and nature of a skeleton of honeycomb structure (cordierite, kaolin-aerosil). The obtained results are important for development of sensors on the basis of indium oxide to monitor nitrogen oxides (NOX) of oxygen-containing gas emissions with high humidity, for creation of commercial catalysts for purification of great volumes of oxygen-containing emissions, in particular, of gas-compressor, gas-turbine and diesel-generator plants from nitrogen oxides.