XAFS study on the sulfidation mechanisms of Co-Mo catalysts supported on activated carbon and alumina: effect of complexing agent.
The effect of nitrilotriacetic acid (NTA) as a complexing agent on the sulfidation mechanisms of Co-Mo catalysts supported on activated carbon and alumina was examined by the XAFS technique. The XAFS results revealed that NTA interacted with Co atoms and formed the Co-NTA interaction, while it showed almost no influence on the local structures around Mo atoms. The Co-NTA interaction suppressed the aggregation of cobalt atoms and the interaction between cobalt and alumina during sulfiding, and consequently promoted the formation of the Co-Mo-S phase.
Tsuji
K
K
Cosmo Research Institute, Saitama, Japan. koji_tsuji@cosmo-oil.co.jp
Umeki
T
T
Yokoyama
Y
Y
Kitada
T
T
Iwanami
Y
Y
Nonaka
O
O
Shimada
H
H
Matsubayashi
N
N
Nishijima
A
A
Nomura
M
M