Temperature effects weighing data

Figure 2-6 Effect of temperature on weighing data. Absolute error as a function of time after the object was removed from a 110°C drying oven.

The coal gas isothermal adsorption and desorption experiment system mainly includes coal gas adsorption and desorption experiment system, data acquisition system, constant temperature system, weighing system and drying of degassing system. In order to investigate the effect of coal... 

We now cite the types of experimental data in the literature, by which an analysis of surface adsorption effects is carried out. One common experiment involves measuring adsorption isotherms. By weighing or by volumetric techniques one determines as a function of equilibrium gas pressure the amount of gas held on a given surface at a specified temperature. Usually this quantity varies sigmoidally with rising pressure P, as sketched in Fig. 5.2.1 for a variety of temperatures 7). By standard methods that rely on the Brunauer, Emmett, Teller isotherm equa-tion one can determine the point on the isotherms at which monolayer coverage of the surface is complete it is usually is located fairly close to the knee of the isotherm. From the cross sectional area of the adsorbate molecules and from the amount needed for monolayer coverage one may then ascertain more or less quantitatively the surface area of the adsorbent. As-... 

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