additives, a mixture of Ce, Zr, La oxides is successfully used.
The most commonly used ratio of Pt:Pd:Rh is 1:5:1 and total concentration of active ingredients is 1.4÷2.1 grams per liter of catalyst. When using this catalyst for complex conversion of emissions from ICE running on natural gas, in λ = 1 mode or methane oxidation (λ>1) the concentration of Pt-Pd-Rh is increased to 4 or more grams per liter of catalyst.