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Updated: Jun 5, 2026

Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
Ammonia IRMS-TPD measurements on Brønsted acidity of proton-formed SAPO-34
Katsuki Suzuki1, Takuma Nishio, Naonobu Katada
1Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Koyama-cho, Tottori 680-8552, Japan.
Abstract:
By utilizing the advantages of a combined method of IRMS-TPD of ammonia and DFT calculations, the solid acidity of HSAPO-34 was studied. The number, strength and structure of the Brønsted OH were measured experimentally. The quantitative measurements and DFT calculations supported the identification of Brønsted OH to account for the generation model of the Brønsted OH primarily located in the edge of the Si domain (island). The acid strength of SAPO-34 was slightly weaker than that of chabazite, a zeolite with the same structure. Thus, some important insights were obtained to understand the acid site generation of SAPO-34.
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