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Local forcing of a nonlinear surface reaction: CO oxidation on Pt(100)
Author(s) -
Bilbao Daniel,
McMillan Noah,
Lauterbach Jochen,
Snively Christopher M.
Publication year - 2009
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11655
Subject(s) - forcing (mathematics) , catalysis , perturbation (astronomy) , nonlinear system , surface (topology) , capillary action , chemical physics , thermal stability , thermal , chemistry , materials science , chemical engineering , nanotechnology , thermodynamics , physics , geometry , mathematics , atmospheric sciences , biochemistry , organic chemistry , quantum mechanics , engineering
Abstract A novel spatiotemporal perturbation method for nonlinear surface reactions is reported, thus allowing the creation of new spatially localized structures. Forcing was achieved by dosing reactant gases through a capillary positioned near the catalyst surface, providing control over the local surface coverage and reaction rate. The emergence of localized concentration patterns and oscillations in an otherwise stable system is attributed to a local modification of the catalytic properties of the surface due to external forcing. Based on the spatial orientation, the temporal and thermal stability of the modified surface, as well as the affinity of CO toward the perturbed surface, subsurface O is proposed as a possible source of the observed localized patterning and surface memory effect. © 2008 American Institute of Chemical Engineers AIChE J, 2009