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Improved Cyclohexane Oxidation Catalyzed by a Heterogenized Iron (II) Complex on Hierarchical Y Zeolite through Surfactant Mediated Technology
Author(s) -
VanDúnem Vanmira,
Carvalho Ana P.,
Martins Luísa M. D. R. S.,
Martins Angela
Publication year - 2018
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201800921
Subject(s) - zeolite , cyclohexanol , cyclohexanone , cyclohexane , catalysis , hydrogen peroxide , chemistry , inorganic chemistry , pulmonary surfactant , nuclear chemistry , organic chemistry , biochemistry
The hydrotris (pyrazol‐1‐yl) methane iron (II) complex [FeCl 2 (Tpm)] [Tpm=HC(C 3 N 2 H 3 ) 3 ] was successfully immobilized, by the incipient wetness impregnation method, in parent and hierarchical Y zeolite modified through surfactant mediated methodology using different bases (NH 4 OH, NaOH or TPAOH). The catalytic performance and recyclability of supported Fe complex was evaluated in the oxidation of cyclohexane with hydrogen peroxide to cyclohexanol and cyclohexanone under mild conditions and two distinct behaviors were observed: using commercial Y and modified Y with NaOH the complex is anchored mainly at the outer surface of the zeolite supports, resulting in high lixiviation after the first catalytic cycle. When NH 4 OH and TPAOH are used during the zeolite treatments the particular textural parameters exhibited by these two supports are able to effectively retain the complex molecules, resulting in a high recyclability observed after three consecutive cycles, especially when NH 4 OH treated zeolite was used as support.