ADSORPTION AND SURFACE REACTION OF H2 AND CO2 ON SUPPORTED CATALYSTS

Tímea Süli-Zakar

Abstract


The adsorption of CO2 on supported Re catalysts have been investigated by FTIR spectroscopy. Addition of H2 to CO2, initiated the dissociation on all catalysts as indicated by CO bands. Besides, new spectral features were developed, attributed to formate species. This assumption was confirmed by the adsorption of HCOOH vapor on these solids. No bands due to formate were detected on Re/SiO2. Adding methane and ethane to CO2 also led to the appearance of CO bands, the intensities of which were much less compared to the H2 + CO2 co-adsorption. The formation of formate also occurred to a small extent.

It was assumed that the formate species identified in the surface interactions is located on the support, where it is stabilized. The possible pathways of the occurrence of formate complex on the oxides are described.


Keywords


catalyst; support; co-adsorption; H2 + CO2 reaction; formate

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References


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LEITNER, W. , 1995, Carbon Dioxide as a Raw Material: The Synthesis of Formic Acid and Its Derivatives from CO2. Angew. Chem. 34: 2207 – 2221.

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LUCRĂRI ȘTIINȚIFICE MANAGEMENT AGRICOL

ISSN print 1453-1410
ISSN online 2069-2307
(former ISSN 1453-1410, E-ISSN 2069-2307)

PUBLISHER: AGROPRINT Timisoara, Romania
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