TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The rhodium compound promoter comprises a combination of metal compounds selected from iron + zirconium and optionally a lanthanide; iron + a lanthanide; iron + vanadium zirconium and optionally a lanthanide; vanadium and iron + a lanthanide. The lanthanide compound is selected from lanthanum, praseodymium and samarium. The combination of metal comprises iron and zirconium compounds. Combination of metal compounds further comprises a lanthanide. The catalytic composition has no alkali metal. The precursor of rhodium compound is an inorganic salt selected from chloride, bromide, iodide, rhodium nitrate and carbonate; an organic salt selected from rhodium acetate and oxalate; or a rhodium complex selected from ethylenediamine, pyridine complexes, cyclooctadiene complexes, cyclopentadienyl complexes, pi-allyl complexes, rhodium complexes and allene complexes trialkylphosphine and triarylphosphine. The precursor of rhodium compound promoter is selected from inorganic salts are chlorides, nitrates, carbonates and hydroxides; selected from acetates, formates, oxalates, silyl ether salts, acetylacetonates, alkoxides polyhydroxystearates and organic salts; dicyclopentadienyl complex or pi-allyl complexes, benzyl complexes and iron allene complexes, zirconium, vanadium and lanthanide elements. Preferred Composition: The rhodium compound is in an amount ranging between 0.1 and 20 wt.% relative to the total weight of the catalyst composition. The molar ratio between the compound of rhodium and the promoter s between 1:10 and 10:1. Preferred Process: Impregnation of the precursor compound and rhodium precursor rhodium compound promoter is performed sequentially in any order, or simultaneously. Preferably, impregnation of the precursor compound and rhodium precursor rhodium compound promoter is performed simultaneously, and involves: (a) co-impregnating the ceria support with a solution comprising a precursor rhodium compound and a precursor of rhodium compound promoter; (b) subjecting the impregnated carrier to a drying step; (c) subjecting the dried impregnated support to a calcination step; and (d) subjecting the calcined solid obtained in step (c) to a reduction process. The process involves: (a) impregnating the ceria support with a precursor solution comprising a zirconium compound or a precursor vanadium compound; (b) subjecting the impregnated carrier to a drying step to remove solvent from the solution used in step (a); (c) co-impregnating the support obtained in step (b) with a solution comprising a precursor compound of rhodium metal and other metal precursors of compounds which act as promoter of rhodium compound not included in the solution of step (a); (d) subjecting the impregnated support obtained in step (c) to a drying step to remove solvent from the solution used in step (c); (e) subjecting the impregnated and dried carrier obtained in step (d) to a calcination step; and (f) subjecting the calcined solid obtained in step (e) to a reduction process. Calcination step is performed by subjecting the impregnated and dried support to heating between 250 and 600 degrees C, and applying a heating rate of between 1 and 10 degrees C/minute. The reduction step is carried out by applying onto the calcined solid at temperature between 275 and 500 degrees C, and passing a gas containing a reducing agent. EXAMPLE - No suitable example given.