Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 334, Issue 1-2, Pages 44-51Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2010.10.021
Keywords
Epoxidation; Alkene; Co-L; Co-ZSM-5(L); Schiff-base ligands; Air
Categories
Funding
- Hubei Provincial Education Department of China [T200701]
- Hubei Provincial Science & Technology Department of China [2008CDA030]
- SRF for ROCS, SEM of China [[2007]24]
- Chen Guang Scheme for Young Scientists of Wuhan City [201050231087]
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Three tridentate or bidentate Schiff-base ligands inclusive of salicylaldehyde benzoylhydrazone (L-1), vanillic aldehyde benzoylhydrazone (L-2) and 4-methyl benzaldehyde benzoylhydrazone (L-3), have been designed, synthesized and employed to coordinate with Co2+ ions and ion-exchanged Co-ZSM-5 forming several Co-L complexes and Co-ZSM-5(L) composite catalysts. The catalytic epoxidation of several alkenes with dry air has been carried out at 90 degrees C under atmospheric pressure using Co-L complexes and Co-ZSM-5(L) catalysts (using TBHP in small amounts as the initiator). In contrast, the catalysts Co-ZSM-5(L) shows higher catalytic activity than Co-ZSM-5 itself and Co-L complexes. Among three Co-ZSM-5(L) catalysts, Co-ZSM-5(L-1) exhibits the highest activity for the selective epoxidation of alkenes. Recycling studies show the recyclability of Co-ZSM-5(L-1) as a heterogeneous catalyst, which does not lose the catalytic activity after even eight reuses appreciably. Based on the experiments, one possible reaction mechanism is proposed. (C) 2010 Elsevier B.V. All rights reserved.
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