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The effect of boundaries on pattern formation was studied for the catalytic oxidation of carbon monoxide on platinum surfaces. Photolithography was used to create microscopic reacting domains on polycrystalline foils and single-crystal platinum (110) surfaces with inert titanium overlayers. Certain domain geometries give rise to patterns that have not been(More)
We present a major improvement to the Fourier-transform infrared (FTIR) imaging technique brought about by replacement of the commonly used step-scan spectrometer with a rapid-scanning spectrometer. This advancement dramatically decreases the time required for data collection without decreasing the data quality. With this new instrumental setup, an imaging(More)
High-throughput experimentation in heterogeneous catalysis has recently experienced nearly exponential growth. Initial qualitative screening has evolved into quantitative high-throughput experimentation, characterization, and analysis. This allows high-throughput catalysis now to rise above simple screening to the level of fundamental understanding of(More)
In the asynchronous, rapid-scan approach to Fourier transform infrared (FT-IR) imaging, data sampling is not correlated with the zero crossings of the interference fringes of the HeNe reference laser. The success of this data collection scheme depends on the reproducibility of the clock signals driving the interferometer mirror and focal plane array data(More)
The traditional approach followed for mathematically modeling physico-chemical processes on catalytic surfaces in®ol®es the choice of an infinitesimal surface area on the catalyst and formulation of mass balances in®ol®ing adsorbate surface concentrations. Such a strategy is inadequate when the catalytic surface itself changes dynamically (with respect to(More)
Introduction The oxidation of CO on Pt catalysts has been shown to exhibit complex, non-linear behavior, such as reaction rate oscillations and spatio-temporal pattern formation over a wide range of reaction conditions [1]. At pressures above 1x10 Torr, individual regions of the catalyst surface are primarily coupled through thermal fluctuations within the(More)
Experimental studies of CO oxidation on Pt͑100͒ over two different ranges of reactant pressures will be reviewed. Using photoemission electron microscopy ͑PEEM͒, spatio-temporal pattern formation was observed at temperatures between 420 and 540 K in the 10 Ϫ5 mbar pressure range. In an attempt to bridge the ''pressure-gap,'' ellipsomicroscopy for surface(More)
Introduction Interfacial patterning is a common feature of many non-linear systems ranging from isothermal chemical reactions [1] to viscous flow systems [2]. Underlying this behavior is the spatial decoupling of chemical species due to differences in convective or diffusive transport. The oxidation of CO on Pt(100) represents a non-linear system where(More)