III International Conference

PP-II-127THE DESIGN OF THE ACTIVE COMPONENTS DISTRIBUTION THROUGHOUTTHE PORES OF DIFFERENT SIZE IN CATALYSTS OF HYDROCATALYTICPROCESSES (OIL REFINING)Smolikov M.D., Udras I.E., Belyi A.S.Institute of Hydrocarbon Processing SB RAS, Omsk, RussiaE-mail: udras@incat.okno.ruThe present-day condition of problem of catalyst active component distribution in thesupporter porous matrix is analyzed. An experimental approach for measurement of thequantity of surface centers of Pt, Pd and Mo in the pores with different size of hydrocatalyticprocesses catalysts on the basis of SiO 2 and Al 2 O 3 is suggested. The results of the influence ofpreparation parameters on the active components distribution on the surface of pores withdifferent radius are cited.Distribution of an active component (AC) in porous structure of hydrocatalytic processescatalysts is an important characteristic because it influences on the local concentration(density) of substances fixed on certain areas of supporter surface and so determines thestability of an active phase to agglomeration. Displacement of the active phase localization inthin supporter pores can determine its accessibility for reactive molecules and also stability todeactivation by coconut sediment at plugging (blocking) of thin pores by coconut. Thus thenature of AC distribution throughout the pores with different size will influence on theretention of catalyst operating characteristics at its exploitation to a great extent.During the preparation process of supported catalysts of hydrocatalytic processes(reforming, hydrofining) combination of diffusion and sorption processes on the soaking stageof porous matrixes of supporters by active substances controls penetration and consequentlydistribution of the active component not only throughout the volume of a supporter granule(this phenomenon is well-known and studied for a long time [1]). At the same time with thedisplacement of the active substances throughout a granule the migration of adsorbedpredecessors throughout the volume of the pores with different size with the followingprecipitation of the active substances in them always takes place. Because of diffusionprocesses the appearance of differences of metal concentration in thin and large pores wouldbe expected.In the work the present-day condition of problem of catalyst active componentdistribution in the supporter porous matrix is analyzed. An experimental approach formeasurement of the quantity of surface centers of Pt, Pd and Mo in the pores with different396