Redox behaviour of transition metal ions in zeolites. Part 8.—Characterization of a ruthenium metal phase in NaY zeolite

摘要: RuNaY zeolite was prepared by ion exchange with Ru3+-hexammine. This complex decomposed and the ions reduced to metal state. The influence of water present during reduction sintering in oxygen investigated at different temperatures.Temperature programmed oxidation experiments allow an overall characterization detection possible bidisperse systems particle sizes. Ruthenium is held very easily supercages. When Ru agglomerates are built up holes crystals. In presence excessive occurs large crystals formed outside zeolite. picture obtained using transmission electron microscopy, microprobe analysis X-ray line broadening techniques. Chemisorption hydrogen its desorption a temperature run indicate that particles absorb subsurface hydrogen. determination Ru-particle sizes from latter measurements not straight-forward.