Composition Cumulative , Volumes

In Table 2 the textural properties of all the composites heat-treated at 150°, 500°C and 850°C are presented. The sample designation is the same as that used for the raw materials with the addition of the letter m to indicate that the results refer to monolith composites. The total pore volume is the sum of the micro- and mesopore volumes (0-2 nm and 2-50 nm) calculated from the corresponding nitrogen adsorption/desorption isotherms, and the macroporosity (50 nm - 100 pm) determined from MIP, respectively. The threshold diameter was that at which in the MIP analysis there was a sudden upswing in the cumulative volume curve where a large part of the porous network became filled. This pore size can be considered as that which controls any transport phenomena through the solid sample. 

Low-level wastes high in sodium content have been collecting at the ICPP for years. Though these wastes represent but a small fraction of the total wastes produced, their cumulative volume is considerable (106 gal). The typical composition of high sodium concentration waste is shown in Table IV. 

A note on intensive and extensive properties Many things we are surrounded with can be added or subtracted money, apples, liters of gas. Mass, distance, volume, and time can accumulate and this is how we label them cumulative properties. We can also use the words extrinsic or extensive for these properties. Pressure, on the other hand, depends on two quantities, two properties force and area. We say that pressure is a composite property. For this reason we cannot add, subtract, or multiply two pressures. There are other properties that cannot be added, subtracted, and multiplied with each other and we have a common name for them intensive properties. Other words with the same meaning as intensive are intrinsic or specific. 

Figure 2. A) Nitrogen adsorption-desorption isotherms of composite catalysts with 0, 25, 50% w/w sepiolite content measured as the volume of N2 (Vn2) versus the relative pressure (P/P ). B) MIP cumulative pore volumes (Vp) for 0,12.5,25, 37.5 and 50% w/w sepiohte.

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