Supported perovskite-type oxides and methods for preparation thereof

A method for converting hydrocarbons by cyclic auto-thermal reforming into hydrogen and carbon monoxide by contacting alternately air and a hydrocarbon/steam mixture with a composition comprising a supported perovskite-type oxide having a general formula AxA′x′ByB′y′O3−δ, wherein:

• A is an ion of a metal of Group IIIa or IIIb of the periodic table of elements or mixtures of these;
• A′ is an ion of a metal of Groups Ia or IIa of the periodic table of elements or mixtures of these;
• B and B′ are ions of a d-block transition metal of the periodic table of elements or mixtures of these;
• x, x′, y and y′ range from 0 to 1.05;
• 0.95<x+x′<1.05;
• 0.95<y+y′<1.05;
• and
• δ is the deviation from ideal oxygen stoichiometry;
• wherein said supported perovskite-type oxide provides oxygen storage capability.