TY - JOUR
T1 - Some aspects of metal-support strong interactions in Rh/Al2O3 catalyst under oxidising and reducing conditions
AU - Zimowska, M.
AU - Wagner, Jakob Birkedal
AU - Dziedzic, J.
AU - Camra, J.
AU - Borzęcka-Prokop, B.
AU - Najbar, M.
PY - 2006
Y1 - 2006
N2 - The aim of the Letter is to elucidate the nature of metal-support interaction in the 2wt% Rh/Al2O3 catalyst obtained by annealing Rh–O–Al xerogel at 1113K in air.XPS, HRTEM, and XRD results reveal that during the Rh–O–Al xerogel annealing in air, rhodium incorporates into forming alumina, which results mostly in Rh4+/δ-Al2O3 solid solution formation. However, in the course of the catalyst reduction at 773 with H2 and at 823K with CH4 the Rh4+/δ-Al2O3 solid solution transforms into Rh–Al alloy. The islands of rhodium form on the surface of the Rh–Al alloy nanocrystallites if the reduction is slow enough.
AB - The aim of the Letter is to elucidate the nature of metal-support interaction in the 2wt% Rh/Al2O3 catalyst obtained by annealing Rh–O–Al xerogel at 1113K in air.XPS, HRTEM, and XRD results reveal that during the Rh–O–Al xerogel annealing in air, rhodium incorporates into forming alumina, which results mostly in Rh4+/δ-Al2O3 solid solution formation. However, in the course of the catalyst reduction at 773 with H2 and at 823K with CH4 the Rh4+/δ-Al2O3 solid solution transforms into Rh–Al alloy. The islands of rhodium form on the surface of the Rh–Al alloy nanocrystallites if the reduction is slow enough.
U2 - 10.1016/j.cplett.2005.09.112
DO - 10.1016/j.cplett.2005.09.112
M3 - Journal article
SN - 0009-2614
VL - 417
SP - 137
EP - 142
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 1-3
ER -