Abstract
A modified gas effluent analysis apparatus is combined with a high-precision gas mixer to be extensively applied to the study of the gas-solid reaction involving not only evolution but absorption of gases and also to the measurement of physico-chemical change of solid. The sample is heated or cooled at the constant rate in a mixed flow of two or more different gases such as He-O2, He-CO2 Ar-H2, etc. The change in the composition of the gas passing through the reactor, due to the decomposition or the gas-solid reaction, are detected at a high sensitivity by a thermal conductivity detector. The sample weight required for the usual measurement is 550 mg. It is applicable to the range from room temperature to 1600°C and the gas flow of any mixing ratio. Although the limits of determination are affected by the operating conditions, an increase or decrease of 0.010.0001 ml of oxygen in the He-O2 mixtures can be detected.
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