New Methods for Studying Gas Solid Reaction Kinetics Using Automated Resistance Monitoring

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Abstract
A new analog‐to‐digital method of monitoring and recording transient electrical resistance vs time data is described, together with its application to kinetic studies of gas/metal reactions at filament temperatures above 1000 K. Resistance measurements with a precision of 0.02% are recorded at up to 40/sec on paper tape to facilitate digital computer data processing. Owing to its speed and accuracy, the method is shown to permit reaction rate determinations during transient temperature operation; allowing a portion of the Arrhenius diagram to be obtained in a single experiment, and experiments through or up to phase transformation temperatures (e.g., filament melting). Illustrative results are presented and discussed for the F‐atom/platinum reaction, which exhibits a reaction rate maximum at a temperature well below the Pt melting point.