Chemical Adsorption Methods

Preparation steps for standard methods of chemical adsorption have been developed over a number of years and are recommended starting points for creating other methods.

 

For each method, the recommended vacuum set point is 5 mmHg; the recommended temperature increase rate is 10 ºC per minute.

Method 1 * Prepares the sample for carbon monoxide as the analysis gas.
Method 2 * Prepares the sample for hydrogen as the analysis gas.
Method 3 Prepares the sample for oxygen as the analysis gas; usually used with silver.
Method 4 Prepares the sample for hydrogen-oxygen titration.

* Requires repeat analysis

Samples are evacuated to the vacuum set point and evacuation continues for the specified time.

  • Flow (soak). Ramp up to the specified temperature, and then continue flowing (soaking) for the specified time.
  • Time. Total time below the vacuum set point that the sample spends at the specified temperature or pressure.
 
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