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Tracking catalytic reactions in microreactors
Date:2/21/2014

at ALS beamline 1.4.

"ALS beamline 1.4 provides a bright infrared beam with a diameter of less than 10 micrometers," Gross says. "The small diameter of the beam enabled us to draw a map of the flow reactor with high spatial resolution of up to 15 micrometers. Without this high resolution imaging, we would not be able to track and understand key processes in the catalytic reaction."

In following the reaction kinetics step-by-step, the Berkeley researchers discovered that the catalytic reaction they were observing is completed within the first five-percent of the flow reactor's volume, which meant that the remaining 95-percent of the reactor, though packed with catalyst did not contribute to the catalytic process.

"Based on this result, we were able to minimize the volume of the flow reactor and the amount of catalyst by an order of magnitude without deteriorating the catalytic reactivity," Gross says.

While the infrared microspectroscopy technique employed in this study allowed one-dimensional mapping of a catalytic reaction along the path of the flow reactor, the actual flow reactor is three-dimensional. Gross and Toste along with Michael Martin and Hans Bechtel, beam-scientists at the ALS infrared beamline, are now exploring techniques that would permit two- and three-dimensional mapping of catalytic reactions.

"Multidimensional imaging will give us the ability to know where exactly inside the volume of the flow reactor the catalytic reaction takes place," Gross says. "This will provide us advanced tools for better understanding and optimization of the catalytic reaction."


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Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

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