caa a22 4500 47575980X CHVBK 20180406123547.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1007/BF02495757 doi (NATIONALLICENCE)springer-10.1007/BF02495757 Study of the state of rhodium in the potassium rhodiumundecatungstosilicate/alumina system by diffuse-reflectance IR spectroscopy [Elektronische Daten] [P. Korovchenko, R. Gazarov, L. Kustov] Adsorption of CO on the catalytic system K5[SiW11RhO39]/Al2O3 was studied by diffuse-reflectance IR spectroscopy. The electronic state of rhodium and thermal stability of the system in the redox cycles were studied. The oxidized heteropolycompound (HPC) contains the charged forms Rh+, Rh2+, and Rh3+. Their ratio strongly depends on the pre-treatment temperature of the sample. In the reduced HPC two main forms of rhodium exist: the ionic Rh+ and metallic Rh0. The supported HPC structure is stable in an oxidative medium at temperatures below ∼900 K. The properties of the K5[SiW11RhO39]/Al2O3 system are retained in the redox cycles up to ∼670 K, and the highly dispersed state of rhodium is observed up to 900 K. Kluwer Academic/Plenum Publishers, 2000 heteropolycompound nationallicence heteropolyanion nationallicence Keggin unit nationallicence rhodium nationallicence heteroatom nationallicence redox cycle nationallicence thermal stability nationallicence diffuse-reflectance FTIR spectroscopy nationallicence carbon monoxide nationallicence probe molecule nationallicence Korovchenko P. I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp, 117917, Moscow, Russian Federation aut Gazarov R. I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp, 117917, Moscow, Russian Federation aut Kustov L. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913, Moscow, Russian Federation aut Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/7(2000-07-01), 1174-1177 1066-5285 49:7<1174 2000 49 11172 https://doi.org/10.1007/BF02495757 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02495757 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Korovchenko P. I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp, 117917, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Gazarov R. I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp, 117917, Moscow, Russian Federation aut NATIONALLICENCE 700 1- Kustov L. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913, Moscow, Russian Federation aut NATIONALLICENCE 773 0- Russian Chemical Bulletin Kluwer Academic Publishers-Plenum Publishers 49/7(2000-07-01), 1174-1177 1066-5285 49:7<1174 2000 49 11172 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer