Direct dehydration of 1,3-butanediol into butadiene over aluminosilicate catalysts
Résumé
The catalytic dehydration of 1,3-butanediol into butadiene was investigated over various aluminosilicates
with different SiO2/Al2O3 ratios and pore architectures. A correlation between the catalytic performance
and the total number of acid sites and acid strength was established, with a better performance for lower
acid site densities as inferred from combined NH3-TPD, pyridine adsorption and 27
Al-NMR MAS spectro-
scopy. The presence of native Brønsted acid sites of medium strength was correlated to the formation of
butadiene. A maximum butadiene yield of 60% was achieved at 300 °C over H-ZSM-5 with a SiO2/Al2O3
ratio of 260 with the simultaneous formation of propylene at a BD/propylene selectivity ratio of 2.5. This
catalyst further exhibited a slight deactivation during a 102 h run with a decrease in the conversion from
100% to 80% due to coke deposition as evidenced by XPS and TGA-MS, resulting in a 36% loss of the spe-
cific surface area.
Domaines
Catalyse
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Licence : CC BY NC - Paternité - Pas d'utilisation commerciale
Licence : CC BY NC - Paternité - Pas d'utilisation commerciale