TAILIEUCHUNG - Thermodynamics Interaction Studies Solids, Liquids and Gases 2011 Part 6

Tham khảo tài liệu 'thermodynamics interaction studies solids, liquids and gases 2011 part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 240 Thermodynamics - Interaction Studies - Solids Liquids and Gases pv c 77-77- 158 Vm T The parameter Wo is the micropore volume and Vm is the liquid molar volume. Here we have assumed that the state of adsorbed molecule in micropores behaves like liquid. Dubinin-Radushkevich equation 157 is very widely used to describe adsorption isotherm of sub-critical vapors in microporous solids such as activated carbon and zeolite. One debatable point in such equation is the assumption of liquid-like adsorbed phase as one could argue that due to the small confinement of micropore adsorbed molecules experience stronger interaction forces with the micropore walls the state of adsorbed molecule could be between liquid and solid. The best utility of the Dubinin-Radushkevich equation lies in the fact that the temperature dependence of such equation is manifested in the adsorption potential A defined as in eq. 154 that is if one plots adsorption data of different temperatures as the logarithm of the amount adsorbed versus the square of adsorption potential all the data should lie on the same curve which is known as the characteristic curve. The slope of such curve is the inverse of the square of the characteristic energy E pEO. To show the utility of the DR equation we fit eq. 157 to the adsorption data of benzene on activated carbon at three different temperatures 283 303 and 333 K. The data are tabulated in Table and presented graphically in Figure . 283 K 303 K 333 K p kPa cu mtnole g p kPa cu mmole g p kPa Cp mmole g 0 0133 36260 3 9380 .

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