Direct dehydration of 1,3-butanediol into butadiene over aluminosilicate catalysts

Fangli Jing (1, 2) , Benjamin Katryniok (1) , Marin Araque (1) , Robert Wojcieszak (1) , Mickaël Capron (1) , Sébastien Paul (1) , Marco Daturi (3) , Jean-Marc Clacens (1) , Floryan de Campo (4) , A. Liebens (4) , Franck Dumeignil (1, 5) , Marc Pera-Titus (4)

1 UCCS - Unité de Catalyse et Chimie du Solide - UMR 8181
2 SCU - Sichuan University [Chengdu]
3 LCS - Laboratoire catalyse et spectrochimie
4 E2P2L - Eco-Efficient Products & Processes Laboratory
5 IUF - Institut universitaire de France

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

Fangli Jing, Benjamin Katryniok, Marin Araque, Robert Wojcieszak, Mickaël Capron, et al.. Direct dehydration of 1,3-butanediol into butadiene over aluminosilicate catalysts. Catalysis Science & Technology, 2016, 6 (15), pp.5830-5840. ⟨10.1039/c5cy02211h⟩. ⟨hal-01772450⟩