NH3 adsorption on the brönsted and Lewis acid sites of V2O5(010): A periodic density functional study

Xilin Yin, Huanmei Han, Isao Gunji, Akira Endou, S. Salai Cheettu Ammal, Momoji Kubo, Akira Miyamoto

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76 Citations (Scopus)

Abstract

This paper deals with the adsorption states of ammonia on both the Brönsted and Lewis acid sites of V2O5-(010) surface using the periodic boundary first-principles density functional (DFT) calculations. The calculated results indicate that ammonia adsorption takes place on both the Brönsted and Lewis sites of V2O5 surface, whereas the adsorption on the Brönsted sites is found to be more favorable energetically. It is observed that ammonia adsorbs on the Lewis sites with different coverages, whereas stability under high coverage is low due to the steric repulsion derived from the coadsorbed ammonia molecules. In both the cases, it shows that the coordination interaction and hydrogen bonding between the N-H and vanadyl oxygen contributes to the binding energy. As for the adsorption on the Brönsted sites, it is found that the H-bonding plays a crucial role and that the ammonium species was formed when NH3 adsorbs at the hydroxyl group containing the vanadyl oxygen. This is in agreement with the IR observations. Furthermore, it is confirmed that the hydroxyl group consisting of the vanadyl oxygen acts as the most reactive site for ammonia adsorption.

Original languageEnglish
Pages (from-to)4701-4706
Number of pages6
JournalJournal of Physical Chemistry B
Volume103
Issue number22
DOIs
Publication statusPublished - 1999 Jun 3

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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