Scaling Relations and Kinetic Monte Carlo Simulations To Bridge the Materials Gap in Heterogeneous Catalysis
Artikel i vetenskaplig tidskrift, 2017

Scaling relations combined with kinetic Monte Carlo simulations are used to study catalytic reactions on extended metal surfaces and nanoparticles. The reaction energies are obtained by density functional theory calculations, where the site-specific values are derived using generalized coordination numbers. This approach provides a way to handle the materials gap in heterogeneous catalysis. CO oxidation on platinum is investigated as an archetypical reaction. The kinetic simulations reveal clear differences between extended surfaces and nanoparticles in the size range of 1–5 nm. The presence of different types of sites on nanoparticles results in a turnover frequency that is orders of magnitude larger than on extended surfaces. For nanoparticles, the reaction conditions determine which sites dominate the overall activity. At low pressures and high temperatures, edge and corner sites determine the catalytic activity, whereas facet sites dominate the activity at high pressures and low temperatures. Furthermore, the reaction conditions are found to determine the particle-size dependence of the turnover frequency.

platinum nanoparticles

microkinetic modeling

density functional theory

kinetic Monte Carlo

CO oxidation

generalized coordination number

scaling relation

Författare

Mikkel Jørgensen

Kompetenscentrum katalys (KCK)

Chalmers, Fysik, Kemisk fysik

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

ACS Catalysis

2155-5435 (eISSN)

Vol. 7 8 5054-5061

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Fysikalisk kemi

Annan fysik

Teoretisk kemi

Den kondenserade materiens fysik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1021/acscatal.7b01194

Mer information

Skapat

2017-10-07