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METHOD AND APPARATUS FOR THE DYNAMIC SURFACE AREA MEASUREMENT AND FOR THE ISOTHERMAL DETERMINATION BY ADSORPTION AND DESORPTION OF A GAS MIXTURE OF A CONSTANT COMPOSITION
METHOD AND APPARATUS FOR THE DYNAMIC SURFACE AREA MEASUREMENT AND FOR THE ISOTHERMAL DETERMINATION BY ADSORPTION AND DESORPTION OF A GAS MIXTURE OF A CONSTANT COMPOSITION
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机译:通过固定成分的气体混合物的吸附和脱附进行动态表面积测量和等温测定的方法和装置
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摘要
An apparatus applying the dynamic BET-type approach to the measurement of solid surface areas, allowing the pressure on the sample to be varied from a lower, subatmospheric value to a plurality of upper values either greater than or less than atmospheric pressure. Apparatus comprises, in the order of their appearance from upstream to downstream, the following parts: a source of a mixture of gaseous adsorbate and non-adsorbable gas, a pressure reducing valve, a reference circuit and a measurement circuit arranged in parallel, said measurement circuit incorporating a sample holding a cell and both said circuits going through a katharometer, then converging into a vacuum pump. A flow control valve is installed upstream from the sample holding cell and a throttling valve is inserted between said sample cell and the katharometer.
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