Environments of Ni atoms were probed by extended X-ray absorption fine structure (EXAFS) at every elementary step of Ni/SiO2 catalyst preparation by two different methods. Combining the structural information obtained at the atomic level by EXAFS with the observation of the bulk by electron microscopy, detailed reaction procedures leading to different products have been revealed. The reason metal particle size distribution depends on the preparation procedure employed is ascribed to whether or not homogeneous dispersion of a small metal oxide cluster is realized before reduction.
ASJC Scopus subject areas
- Colloid and Surface Chemistry