Temperature-programmed desorption of pyridine on solid superacids

摘要

Temperature-programmed desorption of pyridine on solid superacids has been investigated using an on-line thermal conductivity detector and a flame ionization detector. The effluent gases were collected under liquid N_2 temperature and analyzed using a mass spectrometer. Pyridine is oxidized on both the sulfated and tungstated oxides, and CO_2 and SO_2 are found to desorb above 500℃. The results from the temperature-programmed desorption of pyridine cannot be correlated with the acid strength and the n-butane isomerization activity of the solid superacids.