Temperature Programmed Desorption of Basic Probes on Solid Superacids

Abstract

Abstract: Temperature programmed desorption of pyridine, benzene and toluene from various solid superacids was studied by using both TCDand FIDdetectors.The desorbed gases were collected at liquid N2 temperature and analyzed with a mass-spectrometer.It was found that all these compounds are oxidized on the solid superacids,and CO₂ and SO₂ are found to desorb above 400～500℃ instead of the probes.The peak temperatures and areas on the temperature programmed desorption profiles of the probes from the solid superacids are not correlated with their acid strengths and n-butane isomerization activities.Tlie results verify that pyridine, benzene and toluene cannot be used as the basic probes for the characterization of solid superacids.

Key words: Solid superacid, Pyridine-TPD, Benzene-TPD, Toluene-TPD, Butane isomerization

TrendMD:

HUA Wei-Ming, CHEN Jian-Min, LIAO Chang-Xi, GAO Zi. Temperature Programmed Desorption of Basic Probes on Solid Superacids[J]. Chem. J. Chinese Universities, 1996, 17(3): 447.

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Temperature Programmed Desorption of Basic Probes on Solid Superacids

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