In situ XAFS analysis system for high-pressure catalytic reactions and its application to CO2 hydrogenation over a Rh/Y-zeolite catalyst.
An in-situ XAFS cell was developed and used for the structural analysis of a Rh ion-exchanged zeolite catalyst during high-pressure hydrogenation of carbon dioxide. The in-situ cell enabled analyses of the catalyst structures that changed with the reaction atmosphere and elapsed time; the peak assigned to Rh-O scattering changed to that assigned to Rh-Rh scattering at 404 K during the pretreatment by hydrogen. After 30 min. of the carbon dioxide hydrogenation reaction, the peak intensity assigned to Rh-Rh scattering increased corresponding to the increase in the catalytic activity.
Bando
K K
KK
National Institute of Materials and Chemical Research, Tsukuba, Ibaraki, Japan. bando@nimc.go.jp
Saito
T
T
Sato
K
K
Tanaka
T
T
Dumeignil
F
F
Imamura
M
M
Matsubayashi
N
N
Shimada
H
H