A simple laboratory procedure to detect potential strong metal-support interactions (SMSI) for well-dispersed catalytic metals on oxide supports is described. Cation exchange capacity measurements of the support and the prepared catalyst are determined and the comparison between their values is called the differential cation exchange capacity (DCEC). DCEC results for the high- and low-temperature reduced 2% Pt-TiO2 system are presented and their values are consistent with previous suggestions (Tauster, S. J.; et al. J. Am. Chem. Soc. 1978, 100, 170) of platinum-titanium bonding interactions following high-temperature reductions. A conceptual model is proposed involving isomorphic substitution of Pt into the TiO2 tetrahedral structure. The application of the DCEC technique to other metal-supported catalysts is discussed.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry