The ammonia TPD experiment typically involves the following steps:
Sample Preparation: The catalyst sample is pretreated to remove any adsorbed impurities. Ammonia Adsorption: Ammonia gas is introduced to the sample at a low temperature, allowing it to adsorb on the surface. Temperature Ramp: The temperature is gradually increased at a controlled rate. Desorption Measurement: The desorbed ammonia is measured, usually with a mass spectrometer or a thermal conductivity detector.
