Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces

Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces

Acid activation increases the protonated species on a kaolinite surface at the expense of coordinately bound NH 3 entities. The presence of NH + 4 ions on an activated sample is not proof of the presence of protonic acid centres alone since the added proton may have come from the residual water in t...

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Main Authors: Tabak Ahmet, Afsin Beytullah
Format: Article
Language:English
Published: Hindawi - SAGE Publishing 2001-10-01
Series:Adsorption Science & Technology
Online Access:https://doi.org/10.1260/0263617011494484
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spelling doaj-4d1ddec7085243ddb9cb2d1b1d546fd82021-04-02T11:44:38ZengHindawi - SAGE PublishingAdsorption Science & Technology0263-61742048-40382001-10-011910.1260/0263617011494484Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite SurfacesTabak AhmetAfsin BeytullahAcid activation increases the protonated species on a kaolinite surface at the expense of coordinately bound NH 3 entities. The presence of NH + 4 ions on an activated sample is not proof of the presence of protonic acid centres alone since the added proton may have come from the residual water in the interlayer. Progressive dehydration of the surface results in a strong increase in chemisorbed NH 3 . However, the ‘ring frequency’ region of coordinately bound pyridine (Py) and of the pyridiniumion (Py + ) indicates that the strong acid sites on activated kaolinite are of the Lewis type.https://doi.org/10.1260/0263617011494484
collection DOAJ
language English
format Article
sources DOAJ
author Tabak Ahmet
Afsin Beytullah
spellingShingle Tabak Ahmet
Afsin Beytullah
Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces
Adsorption Science & Technology
author_facet Tabak Ahmet
Afsin Beytullah
author_sort Tabak Ahmet
title Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces
title_short Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces
title_full Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces
title_fullStr Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces
title_full_unstemmed Firmly Adsorbed Ammonia and Pyridine Species at Activated Kaolinite Surfaces
title_sort firmly adsorbed ammonia and pyridine species at activated kaolinite surfaces
publisher Hindawi - SAGE Publishing
series Adsorption Science & Technology
issn 0263-6174
2048-4038
publishDate 2001-10-01
description Acid activation increases the protonated species on a kaolinite surface at the expense of coordinately bound NH 3 entities. The presence of NH + 4 ions on an activated sample is not proof of the presence of protonic acid centres alone since the added proton may have come from the residual water in the interlayer. Progressive dehydration of the surface results in a strong increase in chemisorbed NH 3 . However, the ‘ring frequency’ region of coordinately bound pyridine (Py) and of the pyridiniumion (Py + ) indicates that the strong acid sites on activated kaolinite are of the Lewis type.
url https://doi.org/10.1260/0263617011494484
work_keys_str_mv AT tabakahmet firmlyadsorbedammoniaandpyridinespeciesatactivatedkaolinitesurfaces
AT afsinbeytullah firmlyadsorbedammoniaandpyridinespeciesatactivatedkaolinitesurfaces
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