An easy and convenient TPD method based on the Langmuir adsorption model is developed to calculate the integral heat (Delta(H) over bar (0)) of gaseous adsorbate sorbed on the metallic catalysts. And, the mathematical description for this method is also established. Two systems, the hydrogen absorption into palladium black and the hydrogen adsorption on Ir/Al2O3, were taken to verify this method. The sorbed heats were calculated to be 13.2, 30.6 and 31.5 kJ (.) mol(-1) for Pd black, 10% Ir/Al2O3 and 3% Ir/Al2O3, respectively. The calculated heats are consistent with those obtained from the isosteric and calorimetric methods. [References: 16]
展开▼
