Issue 8, 2011
From the journal:

Physical Chemistry Chemical Physics

Ammonia IRMS-TPD measurements on Brønsted acidity of proton-formed SAPO-34†

Katsuki Suzuki,a   Takuma Nishio,a   Naonobu Katada,a   German Sastreb  and  Miki Niwa*a  

* Corresponding authors

a Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Koyama-cho, Tottori 680-8552, Japan
E-mail: mikiniwa@chem.tottori-u.ac.jp
Fax: +81 857 31 5256
Tel: +81 857 31 5256

b Instituto de Tecnologia Quimica UPV-CSIC, Universidad Politecnica de Valencia, Avenida Los Naranjos s/n, 46022 Valencia, Spain

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.

Graphical abstract: Ammonia IRMS-TPD measurements on Brønsted acidity of proton-formed SAPO-34

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Article information

DOI
https://doi.org/10.1039/C0CP00961J
Article type
Paper
Submitted
23 Jun 2010
Accepted
02 Nov 2010
First published
20 Dec 2010

Phys. Chem. Chem. Phys., 2011,13, 3311-3318

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Ammonia IRMS-TPD measurements on Brønsted acidity of proton-formed SAPO-34

K. Suzuki, T. Nishio, N. Katada, G. Sastre and M. Niwa, Phys. Chem. Chem. Phys., 2011, 13, 3311 DOI: 10.1039/C0CP00961J

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