In:
Green Chemistry, Royal Society of Chemistry (RSC), Vol. 24, No. 23 ( 2022), p. 9303-9314
Abstract:
Selective oxidation of benzene to phenol in a single step is a long-standing challenge and has been a subject of potential interest for researchers. In this study, a nanostructured iron chromite spinel in the pure form was prepared, and it was found that this catalyst selectively oxidized benzene to phenol in a single step under mild and environmentally friendly conditions. The material was thoroughly characterized by XRD, Raman spectroscopy, BET, TEM, SEM, TPR, XPS and TGA. Under optimum reaction conditions, ∼71% benzene conversion with a phenol selectivity of ∼100% was achieved. The recyclability test was conducted and it was found that there was no significant loss of catalytic activity even after 5 recycles confirming the truly heterogeneous nature of the catalyst. For comparison, pure Cr 2 O 3 and Fe 2 O 3 were also prepared by the same hydrothermal method and characterized, and their catalytic activity results were also tested. DFT calculations showed that sp 2 C–H bond activation of benzene over FeCr 2 O 4 (102) and Cr 2 O 3 (102) surfaces required an activation energy of 133.6 kJ mol −1 and 144.2 kJ mol −1 , respectively, matching the experimentally calculated activation barrier of 114 kJ mol −1 and 127.4 kJ mol −1 , obtained from kinetic studies.
Type of Medium:
Online Resource
ISSN:
1463-9262
,
1463-9270
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
1485110-6
detail.hit.zdb_id:
2006274-6
Permalink