The present invention relates to a composition comprising: a) at least one support material; b) at least one metal selected from transition group VIII of the Periodic Table of the Elements and c) at least one compound of the formula (I) R′-A-R″ (I), where A, R′ and R″ are each an organic radical, where R′ and R″ have the structural element —O—P(—O—)2 with trivalent P and are bonded covalently to the A radical via the latter, with the proviso that R′≠R″, to a process for producing such a composition, to the use of the composition and to a process and an apparatus for hydroformylation in which the composition is used.