1. What is Adsorption Constant k?

Definition: The adsorption constant k is a parameter that characterizes the adsorption capacity of an adsorbent material for a specific gas at a given temperature.

Purpose: It helps quantify how much gas can be adsorbed by a solid material under specific pressure conditions.

2. How Does the Calculator Work?

The calculator uses the Freundlich isotherm formula:

Where:

• \( k \) — Adsorption constant
• \( x_{gas} \) — Mass of gas adsorbed (kg)
• \( m \) — Mass of adsorbent (kg)
• \( P_{gas} \) — Pressure of gas (Pa)
• \( n \) — Freundlich adsorption constant (dimensionless)

Explanation: The formula relates the amount of gas adsorbed to the gas pressure and the properties of the adsorbent material.

3. Importance of Adsorption Constant

Details: The adsorption constant is crucial for designing adsorption systems, predicting adsorption capacity, and comparing different adsorbent materials.

4. Using the Calculator

Tips: Enter the mass of gas adsorbed, mass of adsorbent, gas pressure, and Freundlich constant. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for k values?
A: k values vary widely depending on the adsorbent-gas system, ranging from 10^-6 to 10³ or more in different units.

Q2: How does temperature affect k?
A: Generally, adsorption decreases with increasing temperature, so k typically decreases as temperature rises.

Q3: What are common adsorbent materials?
A: Activated carbon, silica gel, zeolites, and alumina are common adsorbents.

Q4: What's the relationship between k and n?
A: k represents adsorption capacity while n indicates adsorption intensity. They are both needed to fully characterize the adsorption system.

Q5: Can I use different units?
A: Yes, but all units must be consistent. The calculator uses kg for mass and Pa for pressure by default.