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

摘要

PANI supported heteropolyacids (HPAs) H_3[PMo_12O_40]xH_2O (HPMo) and H_4[PMo_11VO_40]_yH_2O (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 PANT-supported catalysts have lower values as the unsupported HPAs for acetaldehyde formation. A "compensation effect" was evidenced for acetaldehyde and ethylene formation.