The invention relates to a method for cleaning crude terephthalic acid by means
of catalytic, hydrogenating aftertreatment using a catalyst material containing
at least one hydrogenation metal applied to a carbon carrier consisting of carbon
fibres. The invention also relates to a catalyst consisting of the at least one
catalyst material containing the at least one hydrogenation metal applied to the
carbon fibres, the BET surface of the carbon carrier being 500 m2/g,
and a monolithic catalyst consisting of said at least one catalyst material containing
the at least one hydrogenation material applied to the carbon fibres, and at least
one support element or skeleton element which differs from the catalyst material
and is connected to the same, said element mechanically supporting the catalyst
material and maintaining the same in a monolithic form. The invention further relates
to a method for producing the monolithic catalyst and the use thereof, a reactor
containing a plane catalyst material in the form of woven fabric, knitted fabric
and/or felt, the use of the same and a method for the selective hydrogenation of
carbon-carbon double or triple bonds and/or hydrogenable functional groups in organic
compounds containing the same.