In situ XPS study of methanol reforming on PdGa near-surface intermetallic phases.

ABSTRACT: In situ X-ray photoelectron spectroscopy and low-energy ion scattering were used to study the preparation, (thermo)chemical and catalytic properties of 1:1 PdGa intermetallic near-surface phases. Deposition of several multilayers of Ga metal and subsequent annealing to 503-523 K led to the formation of a multi-layered 1:1 PdGa near-surface state without desorption of excess Ga to the gas phase. In general, the composition of the PdGa model system is much more variable than that of its PdZn counterpart, which results in gradual changes of the near-surface composition with increasing annealing or reaction temperature.In contrast to near-surface PdZn, in methanol steam reforming, no temperature region with pronounced CO(2) selectivity was observed, which is due to the inability of purely inte

SUBMITTER: Rameshan C 

PROVIDER: S-EPMC3405296 | biostudies-literature | 2012 Jun

REPOSITORIES: biostudies-literature