Geometric and electronic approaches to size effects in heterogeneous catalysis |
| |
Authors: | P E Strizhak A I Trypolskyi G R Kosmambetova O Z Didenko T N Gurnyk |
| |
Institution: | 1.Pisarzhevskii Institute of Physical Chemistry,National Academy of Sciences of Ukraine,Kiev,Ukraine |
| |
Abstract: | The influence of electronic and geometric factors is considered in the context of the manifestation of size effects in heterogeneous
catalytic oxidation and hydrogenation reactions. Both of the factors are interdependent; however, the electronic factor predominates
with regard to small metal and metal oxide particles (smaller than 10 nm), for which the energies of electron transitions
in an activated complex are size-dependent. Only the geometry of active component nanoparticles exerts the main effect on
the catalytic properties of coarser particles. In this case, the geometric factor depends on the accessibility of the active
surface to reactants. The probability of the occurrence of complex active centers including several surface atoms increases
as the active component particles of a catalyst become larger. The efficiency of the approach proposed to study the activating
effect of nanophase catalysts is demonstrated using the oxidation and hydrogenation reactions of carbon oxides and the hydrogenation
of acetonitrile and acetone as examples. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|