The catalytic and some physicochemical properties of low percentage su
pported Pd and Pd - bimetallic(Re,Co) and Pd - Rare earths oxides cata
lysts are examined in dehydrogenation reactions of cycloalkanes, cyclo
alkenes and cyclohexadienes, their functional derivatives, heterocycli
c compounds, as well as in aromatization of petroleum fractions at inc
reased temperatures and pressures of hydrogen higher than atmospheric.
The termodinamic factors effect on the dehydrogenation reactions and
mechanism of these reations are considered.