In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 51, No. 27 ( 2022), p. 10486-10500
Abstract:
Metal oxide catalysts are known to trigger C–H bond activation selectively, indicating their suitability for olefin epoxidation. Nano-structured Co 3 O 4 supported on TiO 2 was prepared for selective epoxidation of a number of olefins under optimized reaction conditions. An appropriate synthetic procedure yielded a catalytic material (Co–Ti (NP) HT ) with desired crystal size and interface conditions. Incorporation of Co into the Ti matrix resulted in an enhancement in the specific surface of Ti–Co nanoparticles (77.93 m 2 g −1 ). XPS measurements evaluated the surface cobalt atom concentration (5.77%) in Ti–Co(NP) HT , indicating more dispersion of cobalt oxide species. Catalytic application of the material, using various olefins (under optimized reaction conditions) shows higher conversion ( 〉 85%) in a 6-h time interval. The substrate : oxidant (H 2 O 2 ) concentration in an optimized molar ratio of 1 : 2 shows high olefin conversion for the formation of olefin oxide. The reactivity of olefins was found to be in the order: cyclohexene 〉 methylstyrene 〉 styrene 〉 chlorostyrene 〉 p -nitrostyrene. A DFT model compared the HOMO–LUMO energies of styrene and its substituted forms. The reusability of Ti–Co (NP) HT tested up to four continuous cycles of batch operations indicates a negligible loss (0.25–0.30%) of catalytic activity.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1472887-4
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