Selective hydrogenation of alkenes using ZIF-67 shell membrane deposited on platinum/alumina core catalyst

Feng Jiao (1) , Hailing Guo (1) , Lei Zhao (1) , Junjuan Liu (1) , Yongming Chai (1) , Svetlana Mintova (2, 1) , Chenguang Liu

1 China University of Petroleum
2 LCS - Laboratoire catalyse et spectrochimie

A new core–shell catalyst (Pt/Al2O3@ZIF-67) for selective hydrogenation of alkenes was prepared by coating platinum/alumina (Pt/Al2O3) core with ZIF-67 shell membrane. The aperture size of the ZIF-67 (0.34 nm) is sufficiently small thus exclude large reactant and toxic substances thereby preventing deactivation and leakage of noble metal (Pt) incorporated in the core. The Pt/Al2O3@ZIF-67 core−shell catalyst exhibited exceptional size-selective catalytic properties in hydrogenation reaction. The core-shell catalyst is selective toward alkenes (hexene 0.17 nm, cyclohexene 0.42 nm, cyclooctene 0.55 nm), and showed excellent resistance to sulfur poisoning. The Pt/Al2O3@ZIF-67 core−shell catalyst displayed outstanding stability and maintain high activity and selectivity after four subsequent working cycles. The conversion of hexene reached 100% at 200 °C, while the conversion of cyclohexene and cyclooctene was 40% and 10%, respectively.

Mots clés: Core-shell catalyst; Selective hydrogenation; Sulfur-tolerant material

Domaines: Catalyse; Chimie organique

Feng Jiao, Hailing Guo, Lei Zhao, Junjuan Liu, Yongming Chai, et al.. Selective hydrogenation of alkenes using ZIF-67 shell membrane deposited on platinum/alumina core catalyst. Microporous and Mesoporous Materials, 2019, 276, pp.98-106. ⟨10.1016/j.micromeso.2018.09.026⟩. ⟨hal-02410035⟩