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- W2085914472 abstract "Abstract Niobia-supported and niobia-promoted rhodium catalysts, which exhibit significant SMSI behavior, have been characterized by temperature-programmed reduction, oxidation and desorption (TPR, TPO and TPD, respectively) of hydrogen. Hydrogen desorption from the rhodium metal decreased with increasing catalyst reduction temperature for the niobia-supported and niobia-promoted rhodium catalysts (SMSI), while no great change was observed for the unpromoted Rh/SiO 2 catalyst (non-SMSI). For the Rh/Nb 2 O 5 catalyst, no spillover of hydrogen occurred even at high temperature (773 K). In contrast, the Rh/SiO 2 catalyst exhibited hydrogen spillover, and the amount was increased substantially by the deposition of niobia promoter. The SMSI states of these catalysts were studied by temperature-programmed oxidation. For the Rh/Nb 2 O 5 catalysts, those partially reduced niobia species covering rhodium particles were oxidized around 460 K, and the partially reduced niobia support was oxidized around 600 K. For the Nb 2 O 5 -promoted Rh/SiO 2 catalysts, the amount of reduced niobia species on rhodium particles was estimated by oxygen consumption measurement: the ratio of reduced niobia species with surface rhodium atoms (Rh s ) is about 1.5 in terms of NbO 2 /Rh s for the state of the strong Rh-Nb 2 O 5 interaction." @default.
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- W2085914472 date "1991-01-01" @default.
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- W2085914472 title "Interaction of hydrogen and oxygen with niobia-supported and niobia-promoted rhodium catalysts" @default.
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- W2085914472 doi "https://doi.org/10.1016/s0166-9834(00)83306-0" @default.
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