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Hydrazine Decomposition over Irn/Al2O3 Model Catalysts Prepared by Size-Selected Cluster Sungsik Lee, Chaoyang Fan, Tianpin Wu, and Scott L. Anderson*
 

Summary: Hydrazine Decomposition over Irn/Al2O3 Model Catalysts Prepared by Size-Selected Cluster
Deposition
Sungsik Lee, Chaoyang Fan, Tianpin Wu, and Scott L. Anderson*
Department of Chemistry, UniVersity of Utah, Salt Lake City, Utah 84112
ReceiVed: August 30, 2004; In Final Form: October 13, 2004
Hydrazine decomposition chemistry was probed over a temperature range from 100 to 800 K for a series of
model catalysts prepared by mass-selected Irn
+
deposition on planar Al2O3/NiAl(110). Two sets of experiments
are reported. Temperature-programmed desorption (TPD) was used to study hydrazine desorption and
decomposition on Al2O3/NiAl(110) and on a model catalyst prepared by deposition of Ir+
on Al2O3/NiAl(110)
at a density large enough (5 1014
cm-2
) that formation of a distribution of small Irn clusters on the surface
is expected. This model catalyst was found to have hydrazine decomposition properties qualitatively similar
to those observed on single-crystal Ir and polycrystalline Rh. This catalyst was also studied by X-ray
photoelectron spectroscopy (XPS), to probe TPD-induced changes in the samples. A substantial decrease in
the Ir XPS intensity suggests that considerable sintering takes place when the samples are heated to 800 K.
In addition, a significant fraction of the nitrogen contained in the hydrazine is converted to an aluminum

  

Source: Anderson, Scott L. - Department of Chemistry, University of Utah

 

Collections: Energy Storage, Conversion and Utilization; Materials Science; Chemistry