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Determination of acid sites in solid catalysts by mass spectrometry
Author(s) -
Aramendí María Angeles,
Borau Victoriano,
Jiménez Cesar,
Marinas José María,
Porras Andrés,
Urbano Francisco José
Publication year - 1994
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290080806
Subject(s) - chemistry , titration , pyridine , lewis acids and bases , catalysis , desorption , acid strength , mass spectrometry , brønsted–lowry acid–base theory , inorganic chemistry , analytical chemistry (journal) , chromatography , adsorption , organic chemistry , zeolite
This paper reports a temperature‐programmed desorption mass spectrometry method for determining the nature, number and distribution, according to relative strength, of acid sites in solid catalysts. By using pyridine as the titrant, the overall, Brönsted (B) and Lewis (L) acidities are determined. The Brönsted acidity is obtained individually by titration with 2,6‐dimethylpyridine, whereas the Lewis acidity is calculated by difference. The desorption temperatures for the amines are used as measures of the relative strengths of the different types of acid sites. The results obtained are compared with those provided by a UV‐visible spectrophotometric method reported elsewhere (J. M. Campelo et al., Can. J. Chem. Vol. 61, p. 544 (1983)).