Versatile semi-batch apparatus for manometric measurement of gas-solid reaction rates.

Rev Sci Instrum

Sigma Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Published: September 2021

We describe the design, construction, operation, and performance of a simple and versatile semi-batch reactor that is especially useful for measurement of gas/solid reaction rates at pressures in the range of 1 mTorr to 1500 Torr. The reactor operates by repeatedly imposing small AC modulations of reactant gas pressure on top of a much larger DC pressure background. Based on the rate of pressure relaxation following each AC pulse, the reaction rate is determined. Our design is characterized by modular construction from off-the-shelf, ultra-high-vacuum-compatible components, which facilitate easy retrofitting and adaptation to a range of experimental conditions. Automated experiment control and data acquisition is accomplished via a custom National Instruments LabView virtual instrument. Data analysis is automated using a custom series of Mathworks Matlab scripts. We demonstrate reactor performance through measurements of hydrogenation kinetics for a composite H getter material consisting of 1,4-bis(phenylethynyl)benzene mixed with a palladium/carbon catalyst.

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Source
http://dx.doi.org/10.1063/5.0058181DOI Listing

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