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Polyaniline protonated with heteropolyacids as organicinorganic hybrid materials for catalytic conversion of ethanol

A. POPA1,* , N. PLESU1, V. SASCA1

Affiliation

  1. Institute of Chemistry Timisoara of the Romanian Academy,, Bl. Mihai Viteazu 24, RO-300223 Timişoara, Roumania

Abstract

PANI supported heteropolyacids (HPAs) H3[PMo12O40]⋅xH2O (HPMo) and H4[PMo11VO40]⋅yH2O (HPVMo) were prepared, characterised and tested as catalysts for ethanol conversion. Supported and unsupported samples were characterised by nitrogen physisorption, SEM, thermal analysis and FT-IR spectroscopy. The thermal decomposition of PANI support started at ca. 673K, while for PANI-supported HPAs a decrease of decomposition temperature are observed. The reaction rates of ethanol conversion and acetaldehyde formation increased on PANI supported HPAs comparatively with pure HPAs. The values of apparent activation energies in case of PANI-supported catalysts have lower values as the unsupported HPAs for acetaldehyde formation. A "compensation effect" was evidenced for acetaldehyde and ethylene formation..

Keywords

Polyaniline, Heteropolyacids, Texture, Structure, Ethanol, Catalytic conversion.

Submitted at: Aug. 19, 2008
Accepted at: April 28, 2009

Citation

A. POPA, N. PLESU, V. SASCA, Polyaniline protonated with heteropolyacids as organicinorganic hybrid materials for catalytic conversion of ethanol, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 4, pp. 502-508 (2009)