Study on kinetic model for desorption activation energy of solid acids and characterization of their acidity

The kinetic model for desorption activation energy of solid acids was determined.A new simulation method for determination of desorption activation energy over solid acid catalysts from temperature programmed desorption(TPD) results was established.The results showed that the TPD process fits well with second-order desorption mechanism,and the activation energy for the desorption(acidity) first increased and then declined with activation temperature of the catalyst.The same adsorption order and trends in desorption activation energy over different catalysts were seen between kinetic model from single group of TPD data and multi-groups of TPD data.The kinetic model from single group of TPD data is simpler and more reliable.