[en] The data on hydrogen processing and heating effect in vacuum of ZrR₄/SiO₂ catalysts (where R is allyl, α is metallyl and β is metallyl) on their activity and the transformation character of the surface organometallic compounds are compared. For catalysts based on allyl and on α-metallyl complexes, maximum activity may be reached at the processing by hydrogen within the temperature range of 100-200 deg C. In case of β-metallyl zirconium complexes the temperature growth higher than 100 deg C results in the decrease of their activity. It is stated that the catalyst activity increase, as a result of the processing by hydrogen is connected with the increase of a number of growth centres on their surface