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Influence of surface texture and acid–base properties on ozone decomposition catalyzed by aluminum (hydroxyl) oxides

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Abstract.
The decomposition of aqueous ozone in the presence of three aluminum (hydroxyl) oxides was studied,
respectively. It was hypothesized that surface hydroxyl groups and acid–base properties of aluminum
(hydroxyl) oxides play an important role in catalyzed ozone decomposition. The variables investigated
were oxide dose, aqueous pH, presence of inorganic anions (sulfate and nitrate), the effect of tert-butyl
alcohol (TBA) and surface hydroxyl groups density of the three aluminum (hydroxyl) oxides. All three
aluminum (hydroxyl) oxides tested, i.e. y-AlOOH (HAO), y-Al2O3 (RAO) and a-Al2O3 (AAO), enhanced the
rate of ozone decomposition. The net surface charge of the aluminum (hydroxyl) oxides favored in
catalyzed ozone decomposition. The greatest effect on catalyzed ozone decomposition was observed
when the solution pH was close to the point of zero charge of the aluminum (hydroxyl) oxide. Sulfate and
nitrate were substituted for the surface hydroxyl groups of the aluminum (hydroxyl) oxides, which then
complexed with Al3+ in a ligand exchange reaction. Therefore, inorganic anions may be able to inhibit
catalyzed ozone decomposition. It was confirmed that surface hydroxyl groups were important for ozone
decomposition with aluminum (hydroxyl) oxides as catalysts. TBA inhibited ozone decomposition in the
presence of HAO, RAO and AAO. It was also tested whether aluminum (hydroxyl) oxides catalyzed ozonetransformed hydroxyl radicals. The relationship between surface hydroxyl groups and the ratio of
hydroxyl radical concentration to ozone concentration (Rct) was investigated quantitatively. Higher
density of surface hydroxyl groups of the aluminum oxide tested was favorable for the decay of ozone
into hydroxyl radicals.

Keywords: Aluminum (hydroxyl) oxide, Acid–base property, Point of zero charge, Surface hydroxyl group, Hydroxyl radical.

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Informasi Detail

Judul Seri

Applied Catalysis B: Environmental

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis B: Environmental 84 (2008) 684–690

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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