Size-dependent heterogeneous catalytic kinetics

A quantitative thermodynamic approach is considered with the aim to describe the size-dependent Langmuir–Hinshelwood mechanism and the two-step catalytic cycle. The general treatment takes into account surface energy excess due to an intrinsic increase in chemical potential with size decrease as well as the changes in chemical potential upon adsorption. Numerical simulations as well as qualitative analysis show that for catalytic reactions over nanoparticles not only the rates but also reaction orders can vary depending on the size of nanoclusters. Comparison with experimental data is given.

A quantitative thermodynamic approach is considered with the aim to describe the size-dependent Langmuir–Hinshelwood mechanism and the two-step catalytic cycle. The general treatment takes into account surface energy excess due to an intrinsic increase in chemical potential with size decrease as well as the changes in chemical potential upon adsorption.Figure optionsDownload high-quality image (82 K)Download as PowerPoint slide