Trimethylamine as a probe molecule to differentiate acid sites in Y-FAU zeolite: FTIR study

Article Abstract:

Trimethylamine (TMA) is studied as a probe molecule that is able to distinguish between the different Bronsted acid sites in zeolite frameworks. Typical infrared (IR) bands assigned to TMA-protonated species are detected in the HY zeolite, the wavenumbers of some typical IR bands assigned to TMA-protonated species appear to depend on the acidic strength and a complementary study with ZSM-5 and X-FAU samples have confirmed this proposition.

Methylamines, Zeolites, Acids

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Destructive adsorption of CCl(sub 4) over lanthanum-based solids: Linking activity to acid-base properties

Article Abstract:

The relative activities of a low-surface crystalline and high-surface amorphous LaOCl, are compared for the destructive adsorption of CCl(sub 4). The analogy between methanol dissociation and the removal of the first chlorine atom in the destructive adsorption of CCl(sub 4), the sites enabling twofold coordination were likely to be the same Lewis acid sites actively involved in the destructive adsorption of CCl(sub 4).

Carbon Tetrachloride, Lanthanum & Compounds, Adsorption, Lanthanum

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Infrared study of the surface properties of HTB-type A1-, Cr-, Fe- hydroxyflourides

Article Abstract:

The surface characteristics of iron, chromium and aluminum fluorides in their hexagonal tungsten bronze (HTB) structure are examined by infrared spectroscopy. The power of the acid sites is clearly found powerful than that reported for iron, chromium and aluminum oxides.

Aluminum Fluoride, Usage, Infrared spectroscopy, Fluorides

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