The effect of loading, with chromium and manganese, on the activity of yttria-supported catalysts in the three-way neutralisation of gas emissions

Maximum catalytic activity in NO + CO neutralisation and CH₄ combustion was observed for M/Y₂O₃ (M=Cr and Mn) at a M loading of 3-5%; this is understood to result from the stabilisation of active isolated M ions in yttria due to oxide-oxide interactions between the active transition metal oxide and the support.