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BIBTEX RIS

Adsorption and reaction of formaldehyde on TiO2-supported Rh catalysts studied by FTIR and mass spectrometry

2004; Elsevier BV; Volume: 226; Issue: 1 Linguagem: Inglês

10.1016/j.jcat.2004.05.024

ISSN

1090-2694

Autores

J. Raskó,

Tópico(s)

Carbon dioxide utilization in catalysis

Resumo

The adsorption and surface reactions of formaldehyde were studied on TiO2 and Rh/TiO2 catalysts at 300–473 K by Fourier-transform infrared spectroscopy (FTIR) and mass spectrometry (MS). FTIR bands due to molecularly adsorbed formaldehyde, formate, and formic acid were detected. The dominant surface species was dioxymethylene (DOM, H2CO2(a)) species, a part of which underwent surface polymerization resulting in polyoxymethylene (POM) on the surface. At higher temperatures molecularly adsorbed formaldehyde and DOM surface species decompose producing mainly H2 and CO in the gas phase. The amounts of H2 and CO were proportional with the Rh content of the catalysts. The quantity of ethylene (also formed in the above decomposition), however, changed inversely with the increase of Rh content.

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