TPD Calculation Desorption Energy for Zero Order
Expert Guide to TPD Calculation Desorption Energy for Zero Order
Introduction & Importance
TPD (Temperature Programmed Desorption) is a powerful technique used to study the surface properties of materials. The desorption energy for zero order is a crucial parameter in understanding these properties…
How to Use This Calculator
- Enter the TPD rate (K/min) in the first input field.
- Enter the activation energy (kJ/mol) in the second input field.
- Enter the pre-exponential factor (1/min) in the third input field.
- Click the “Calculate” button.
Formula & Methodology
The formula for calculating the desorption energy for zero order is:
E = -R * T * ln(A * T^2 / β)
Where:
- E is the activation energy (kJ/mol)
- R is the universal gas constant (8.314 J/(mol·K))
- A is the pre-exponential factor (1/min)
- T is the temperature (K)
- β is the heating rate (K/min)
Real-World Examples
Let’s consider three case studies…
Data & Statistics
| Material | E (kJ/mol) | A (1/min) |
|---|---|---|
| Sample 1 | 120 | 1.5 x 10^5 |
| Sample 2 | 150 | 2.1 x 10^6 |
| Temperature (K) | Desorption Rate (mol/min) |
|---|---|
| 300 | 0.01 |
| 350 | 0.1 |
Expert Tips
- Always ensure your TPD data is noise-free for accurate results.
- Consider using multiple heating rates to confirm zero order kinetics.
Interactive FAQ
What is TPD?
TPD is a technique used to study the desorption of adsorbed species from a surface…
What is the difference between zero and first order desorption?
The main difference lies in the dependence of the desorption rate on the surface coverage…