Decomposition of Ammonia and Hydrogen on Ir Surfaces:  Structure Sensitivity and Nanometer-Scale Size Effects

The adsorption and decomposition of ammonia and hydrogen have been studied on surfaces of clean planar Ir(210) and clean nanoscale-faceted Ir(210), which are prepared from the same crystal in situ. We find evidence for structure sensitivity in recombination and desorption of H2 and in thermal decomp...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Chemical Society 2005-04, Vol.127 (14), p.5014-5015
Main Authors: Chen, Wenhua, Ermanoski, Ivan, Madey, Theodore E
Format: Article
Language:English
Subjects:
Adsorption and desorption kinetics
evaporation and condensation
Chemistry
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
General and physical chemistry
Physics
Solid-fluid interfaces
Solid-gas interface
Surface physical chemistry
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The adsorption and decomposition of ammonia and hydrogen have been studied on surfaces of clean planar Ir(210) and clean nanoscale-faceted Ir(210), which are prepared from the same crystal in situ. We find evidence for structure sensitivity in recombination and desorption of H2 and in thermal decomposition of NH3 on clean planar Ir(210) versus clean faceted Ir(210). Moreover, the decomposition kinetics of NH3 on faceted Ir(210) exhibit size effects on the nanometer scale, which is the first observation of size effects in surface chemistry on an unsupported monometallic catalyst with controlled and well-defined structure and size.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja042617c