Characterization of silica-supported Ni catalysts effective for methane decomposition by Ni K-edge XAFS.
The structural change of Ni species during the methane decomposition into hydrogen and carbon over Ni/SiO2 catalyst was investigated by Ni K-edge XANES/EXAFS. Before the contact of methane with the Ni/SiO2 catalyst, Ni species were present as Ni metal mainly. The structure of the Ni metal did not change appreciably when the Ni/SiO2 was actively decomposing methane. In contrast, the formation of nickel carbide species was observed at the deactivation stage of the catalyst.
Takenaka
S
S
Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Japan. stakenak@o.cc.titech.ac.jp
Ogihara
H
H
Yamanaka
I
I
Otsuka
K
K