One-Dimensional Ceria as Catalyst for the Low-Temperature Water-Gas Shift Reaction

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of Physical Chemistry C

DOI:https://doi.org/10.1021/jp9066444· OSTI ID:1020141

Han, W; Wen, W; Hanson, J; Teng, X; Marinkovic, N; Rodriguez, J

Synchrotron-based in situ time-resolved X-ray diffraction and X-ray absorption spectroscopy were used to study pure ceria and Pd-loaded ceria nanotubes and nanorods (1D-ceria) as catalysts for the water-gas shift (WGS) reaction. While bulk ceria is very poor as WGS catalysts, pure 1D-ceria displayed catalytic activity at a temperature as low as 300 C. The reduction of the pure 1D-ceria in pure hydrogen started at 150 C, which is a much lower temperature than those previously reported for the reduction of 3D ceria nanoparticles. This low reduction temperature reflects the novel morphology of the oxide systems and may be responsible for the low-temperature WGS catalytic activity seen for the 1D-ceria. Pd-loaded 1D ceria displayed significant WGS activity starting at 200 C. During pretreatment in H{sub 2}, the ceria lattice parameter increased significantly around 60 C, which indicates that Pd-oxygen interactions may facilitate the reduction of Pd-loaded 1D-ceria. Pd and ceria both participate in the formation of the active sites for the catalytic reactions. The low-temperature hydrogen pretreatment results in higher WGS activity for Pd-loaded 1D-ceria.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1020141
• Report Number(s): BNL--95991-2011-JA
• Journal Information: Journal of Physical Chemistry C, Journal Name: Journal of Physical Chemistry C Journal Issue: 52 Vol. 113; ISSN 1932-7447
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
ABSORPTION SPECTROSCOPY
CATALYSTS
HYDROGEN
LATTICE PARAMETERS
MORPHOLOGY
NANOTUBES
OXIDES
WATER GAS
X-RAY DIFFRACTION
national synchrotron light source