Question

What is the monolayer capacity of a sample of activated alumina with a surface area of 200 m2/g, using the BET theory of multilayer adsorption and assuming a specific surface area of 16.2 × 10-20 m2 for nitrogen at 77 K?

Answer 1

To calculate the monolayer capacity of the activated alumina sample, we need to determine the number of adsorption sites per gram of the sample. We can do this by dividing the total surface area of the sample by the specific surface area of nitrogen.Total surface area of the sample  A  = 200 m/gSpecific surface area of nitrogen  a  = 16.2  10^-20 mNumber of adsorption sites per gram  N  = A / aN = 200 m/g /  16.2  10^-20 m N = 200 / 16.2  10^20N  12.35  10^20 sites/gThe monolayer capacity of the activated alumina sample is approximately 12.35  10^20 sites per gram.