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Definition: This calculator determines the mass of gas adsorbed onto a solid surface according to the Langmuir adsorption model.
Purpose: It helps chemists and chemical engineers quantify gas adsorption for applications like catalysis, gas purification, and surface chemistry studies.
The calculator uses the Langmuir adsorption isotherm formula:
Where:
Explanation: The formula describes monolayer adsorption where the adsorption rate equals the desorption rate at equilibrium.
Details: Accurate adsorption calculations are crucial for designing adsorption systems, understanding surface interactions, and optimizing industrial processes.
Tips: Enter the mass of adsorbent in grams, the adsorption constant (typically determined experimentally), and gas pressure in atm. All values must be > 0.
Q1: What is the adsorption constant (k)?
A: The adsorption constant represents the affinity between the gas and adsorbent. Higher values indicate stronger adsorption.
Q2: What are typical units for the adsorption constant?
A: The adsorption constant typically has units of atm-1 when pressure is in atm.
Q3: What assumptions does the Langmuir model make?
A: It assumes monolayer adsorption, uniform adsorption sites, and no interactions between adsorbed molecules.
Q4: How do I determine the adsorption constant experimentally?
A: It's typically found by measuring adsorption at different pressures and fitting the data to the Langmuir isotherm.
Q5: Can this calculator be used for liquid-phase adsorption?
A: The Langmuir model can be adapted for liquids, but you would need to replace pressure with concentration.