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The hydroxyl species and acid sites on diatomite surface: a combined IR and Raman study

Yuan, Peng, Wu, D. Q., He, Hongping, & Lin, Z. Y. (2004) The hydroxyl species and acid sites on diatomite surface: a combined IR and Raman study. Applied surface Science, 227(1-4), pp. 30-39.

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Abstract

Diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), Raman spectroscopy of adsorbed Pyridine molecules (Py-Raman) and in situ Py-IR have been used to investigate the hydroxyl species and acid sites on diatomite surfaces. The Lewis (L) and BrØnsted (B) acid sites, and various hydroxyl species, including isolated hydroxyl groups, H-bonded hydroxyl groups and physically adsorbed water, are identified. The L acid sites in diatomite samples are resulted from the clay impurities, and the B acid sites are resulted from some moderate strength H-bonded hydroxyl groups. At room temperature, both of the isolated and H-bonded silanols associate with the physically adsorbed water by hydrogen bond. After calcination treatment, physically adsorbed water will be desorbed from the silanols, and the silanols will condense with the increase of temperature. Generally, the H-bonded silanols condense more easily than the isolated ones. The properties of surface hydroxyl species of diatomaceous silica are more similar to precipitated silica rather than fumed silica.

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ID Code: 1733
Item Type: Journal Article
Keywords: diatomite, hydroxyl species, acid sites, IR, Raman
DOI: 10.1016/j.apsusc.2003.10.031
ISSN: 0169-4332
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 24 Jun 2005
Last Modified: 09 Jun 2010 22:26

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