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The volume of nitrogen adsorbed per gram of SiO2 at 77 °K changes, depending on the ratio of the partial pressure of nitrogen P and the vapor pressure Po:

The volume of nitrogen adsorbed per gram of SiO2 at 77 °K changes, depending on the ratio of the partial pressure of nitrogen P and the vapor pressure Po:

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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4. The volume of nitrogen adsorbed per gram of SiO₂ at 77 °K changes, depending on the ratio of the partial pressure of nitrogen P and the vapor pressure Po: V (ml/g) 30 P/Po 0.05 34 0.10 38 0.15 40 0.20 45 48 0.30 0.40 52 108 59 72 0.50 0.60 0.70 0.80 a. Plot the adsorption isotherm V = f (P/Po). What type of isotherm do we get? Give the equation which makes it possible to determine the specific surface of SiO₂. b. Determine the constants of the proposed equation. c. Calculate the specific surface area of SiO₂ (m²/g), knowing that the area occupied by a nitrogen molecule is 16.20 Ų. d. Calculate AH (adsorption) for N₂ (normal conditions) at 1 atm if 200 cm³ are adsorbed per 1 kg of SiO2 at 100 °K, and 20 cm³ are adsorbed at 0°C.
Transcribed Image Text:4. The volume of nitrogen adsorbed per gram of SiO₂ at 77 °K changes, depending on the ratio of the partial pressure of nitrogen P and the vapor pressure Po: V (ml/g) 30 P/Po 0.05 34 0.10 38 0.15 40 0.20 45 48 0.30 0.40 52 108 59 72 0.50 0.60 0.70 0.80 a. Plot the adsorption isotherm V = f (P/Po). What type of isotherm do we get? Give the equation which makes it possible to determine the specific surface of SiO₂. b. Determine the constants of the proposed equation. c. Calculate the specific surface area of SiO₂ (m²/g), knowing that the area occupied by a nitrogen molecule is 16.20 Ų. d. Calculate AH (adsorption) for N₂ (normal conditions) at 1 atm if 200 cm³ are adsorbed per 1 kg of SiO2 at 100 °K, and 20 cm³ are adsorbed at 0°C.
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