Platinum Supported Catalysts: Predictive CO and H2 Chemisorption by a Statistic Cuboctahedron Clusters Model – The Journal of Physical Chemistry C (ACS Publications)

by Anthony Le Valant, Clement Comminges, Fabien Can, Karine Thomas, Marwan C Houalla, and Florence Epron

J. Phys. Chem. C, Just Accepted Manuscript

DOI: 10.1021/acs.jpcc.6b09241

Abstract

Chemisorption of probe molecules such as hydrogen and carbon monoxide on the surface of Pt particles is the most common chemical technique used to estimate the crucial parameters of metal catalysts, namely the dispersion (D), the particle size (d) and the metallic specific surface area (SPt). However, it remains a controversy concerning the stoichiometry of adsorbate per surface metal atom, leading to an inaccurate estimation of D, d and SPt. A model describing the statistics of the surface atoms and sites on perfect cubooctahedron clusters was developed to assess values of D, d and SPt, assuming the most favourable adsorption sites based on DFT calculation of the literature. This model successfully predicted the experimental values of D, d and SPt determined from H or CO chemisorption data, and it allowed providing a set of simple equations for the accurate determination of these parameters from chemisorption experiments on Pt.

Source : Platinum Supported Catalysts: Predictive CO and H2 Chemisorption by a Statistic Cuboctahedron Clusters Model – The Journal of Physical Chemistry C (ACS Publications)