Abstract
Nanoparticles of rhodium oxides of size <3 nm or 6–8 nm were synthesized in the mesoporous MCM-41 molecular sieve (Rh-MCM-41) via sol-gel method. The size of the RhOx particles was varied depending on the synthesis conditions. Rh-MCM-41 samples were characterized by XRD; TEM, 29Si Solid State NMR; BET analysis; XPS and Rh K edge EXAFS. Rh-MCM-41 with <3 nm sized RhOx had exhibited novel promotional effect in the formation of N2 and N2O in the NO-CO catalytic reaction where as the RhOx with size 6–8 nm showed a negative effect.
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