from first principles PP-I-1

PP-III-92shown that at supporting of vanadium oxide on Н- Ti-MCM - 41 order of mesoporousstructure has been violated, a diameter and volume of its mesopores has been decreased andmicropores has been generated. But diameter of mesopores remained in limits that is typicalfor mesoporous materials. In the processes of dehydrogenation of propane the obtainedcatalysts has shown high activity. In the process of DH at 650-675 o C the maximal yield ofpropylene was ~ 70 mol. % and it was 50 mol. % in the process of ODH. The maximal yieldof propylene extremely depended on the formed volume of pores and its correlation withacidity of active sites on the surface of the systems and it corresponded to a certain optimalturn-down of these values, regardless of method of supporting of vanadium oxide. Beingbased on these data, it was supposed that for effective work of catalyst in the processes ofdehydrogenation of propane it is necessary to provide optimal frequency of co-operation ofpropane with active catalytic sites on the surface of walls of mesopores, which causeactivating of propane with continuation of chain reaction in the volume of pores. It is assistedby certain, depending on the concentration of mixture, time of its contact and concentration ofactive sites, optimal size of diameter and volume of pores of support.251