Encapsulation of chiral Mn(III) salen complexes into aluminium pillared clays: Application as heterogeneous catalysts in the epoxidation of styrene

Das, Pankaj; Kuźniarska‐Biernacka, Iwona; Silva, Ana Rosa; Carvalho, Ana P.; Pires, João; Freire, Cristina

doi:10.1016/j.molcata.2005.12.023

Cited by 44 publications

(21 citation statements)

References 52 publications

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“…The number of articles devoted to this field is very long, and we include here only a few references, but it may be taken into account that catalysts based in Co (64,73,102,103), Cr (104,105), Cu (64, 102, 106 -114), Fe (104,113,115,116), Mn (64,103,(117)(118)(119)(120)(121), Ni (64, 107, 111, 122 -126), Pd (33, 127 -136), Pt (60, 133, 137 -150), Rh (151 -155) or V (156 -158), among others, have been prepared. Selective reduction of NOx has been the reaction of environmental interest for which PILCs have been most widely used (102, 103, 106, 109, 111 -115, 117, 132, 157 -164), other reactions, as complete oxidation of VOCs or of CFCs (104, 105, 119, 135, 136, 145, 146, 165 -168) and wet hydrogen peroxide catalytic oxidation of waste (108, 169 -189), have also been studied.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in the Control and Characterization of the Porous Structure of Pillared Clay Catalysts

2008

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Several methods have been developed and applied in recent years in the characterization of the structure of microporous materials, in general, and of pillared clays, in particular. In the present article, the latest results obtained in the control of the microstructure developed in alumina-pillared clays and various approaches used to the evaluation of the porosity of these materials are reviewed. These include the control of the microstructure developed in pillared clays by adjusting the several parameters involved in the synthesis process, and the evaluation of the porosity of pillared clays. Emphasis is given to the methods to evaluate the pore size and pore size distribution (PSD) of these materials. Two separate sections are devoted to review mathematical modeling studies and 129 Xe NMR spectroscopy of physisorbed Xe to investigate the microporous structural properties of these materials.

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Section: Introductionmentioning

confidence: 99%

Recent Advances in the Control and Characterization of the Porous Structure of Pillared Clay Catalysts

2008

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“…This behavior was related to complex leaching and metal deactivation occurring for all materials during the catalytic cycles. The authors extended these studies considering chiral counterparts and enantioselective styrene epoxidation by using two oxidants: iodosylbenzene (PhIO) and a mixture of m-chloroperoxybenzoic acid (m-CPBA) and N-methylmorpholine (NMO) as co-oxidant [70]. The encapsulated complexes gave alkene conversions ranging from 16 to 40%.…”

Section: Epoxidationmentioning

confidence: 99%

Pillared Clay Catalysts in Green Oxidation Reactions

Vicente

Trujillano

Ciuffi

et al. 2010

Pillared Clays and Related Catalysts

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In this chapter, the use of pillared clays as catalysts in green oxidation reactions is considered. Several catalytic oxidation reactions have been selected, and special attention is given to the reaction products and to the yields achieved.Keywords PILC · Pillared clays · Green oxidation reactions · Catalysts IntroductionPillared InterLayered Clays (PILCs, in short) are prepared by exchanging the charge-compensating cations present in the interlamellar space of the clays with hydroxy-metal polycations. On calcination, the inserted polycations yield rigid, thermally stable oxide species, which prop the clay layers apart and prevent their collapse. The intercalation and pillaring processes produce the development of a porous structure with the presence of particular surface sites. These solids have been used in catalytic, purification, and sorption-based separation applications.The methods and the mathematical models used in the characterization of the porous structure of PILCs have been presented in a recent review [1]. From this study and all the references cited therein, it is clear that a great interest exists in the microporous structure of PILCs as well as in the effect of their structure on the applications of these materials. In summary, several researchers have suggested a bimodal micropore distribution for the microporous structure developed by the intercalated and the pillared clays, but this suggestion is open to questioning and can contribute to the expansion of this field in the coming years.Interest in the application of PILCs as catalysts has undergone a huge increase over the last few years [1,2]. One of the most studied subjects related to PILCs

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“…Indeed, when molecular oxygen is used as oxygen atoms donor in homogeneous catalysis, l-oxo dimers are systematically formed in the medium causing a neat weakening of the oxidation reaction evolution due to their inactive catalytic character [18][19][20][21]. To overcome these difficulties, heterogenization of the catalyst have received considerable attention by using different immobilization methods such as (i) intercalation into clays [14,[21][22][23][24][25][26], (ii) encapsulation onto zeolites or mesoporous molecular sieves [8,14,[27][28][29][30][31][32] and (iii) electropolymerization or grafting on polymer matrices [33][34][35][36] or silicates [37,38]. It was concluded that the formation of l-oxo dimers is limited by the immobilization, which consequently increases the turnover frequencies of the catalytic reaction.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical study with cavity microelectrode containing clay-supported Mn(III)salen complex – Dioxygen activation with cytochrome P450 model

Zidane¹,

Ourari²,

Bataille³

et al. 2010

Journal of Electroanalytical Chemistry

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Encapsulation of chiral Mn(III) salen complexes into aluminium pillared clays: Application as heterogeneous catalysts in the epoxidation of styrene

Cited by 44 publications

References 52 publications

Recent Advances in the Control and Characterization of the Porous Structure of Pillared Clay Catalysts

Recent Advances in the Control and Characterization of the Porous Structure of Pillared Clay Catalysts

Pillared Clay Catalysts in Green Oxidation Reactions

Electrochemical study with cavity microelectrode containing clay-supported Mn(III)salen complex – Dioxygen activation with cytochrome P450 model

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