PROJECT ADSORPTION

Analysis of experimental data of N2 adsorption on different adsorbents.

Isotherm BET – Specific Surface Area (SSA) Goal: calculate SSA of adsorbents and make a presentation of the results. 1. Adsorption of N 2 on VYCOR

1.1. Make a graph of isotherm 1. Use Excel to make the graph of n as a function of relative pressure.

2. What type of isotherm it corresponds to?

3. Is there any porosity? 1.2. Application of BET method

1. Use two forms of the equation BET (initial and transformed); explain what the

important parameters are.

2. Which points can we use for the analysis?

3. Which domain of experimental data corresponds to these points?

4. Draw the line BET;

5. Calculate the specific surface (BET type) and parameter nm and C of the BET

equation;

6. Verify the results; 1.3. Application of the ‘method of one point’

1. Calculate the specific surface using the ‘method of one point’;

2. Repeat the calculation using different points.

2. Adsorption of N 2 on alumin Follow the same questions as for VYCOR above (except 1.2.1 and 1.2.2).

3. Conclusion 1. Compare the values calculated with different methods.

2. Compare the specific surface in two systems and try to make conclusions related to

the differences between the studied systems.

4. General properties presentation 1. Define general protocol for specific surface calculations

2. Characterize isotherms (types, possible mechanism of adsorption).

3. Characterize porous systems

4. Compare real isotherm with the BET model (and Langmuir model)

5. Make any comments or discussion you will find interesting