Characterization of the hydrophobicity of mesoporous silicas and clays with silica pillars by water adsorption and DRIFT

Pires, João; Pinto, Moisés L.; Estella, Juncal; Echeverría, Jesús C.

doi:10.1016/j.jcis.2007.09.035

Cited by 51 publications

(25 citation statements)

References 45 publications

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“…This can be interpreted as a result of the APTES grafting not only in the clay sheets borders but also in the clay interlayer region at least in some extension, leading to some degree of expansion of the interlayer region. A similar situation was also reported in the literature for other types of montmorillonite clays [41]. Furthermore, a further shift to low 2 values is observed after complex anchoring (curve 3).…”

Section: Textural Propertiessupporting

confidence: 89%

Anchoring of Chiral Manganese(III) Salen Complex onto Organo Clay and Porous Clay Heterostructure and Catalytic Activity in Alkene Epoxidation

et al. 2009

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The chiral Mn(III) salen complex (C1) was immobilised onto a natural clay (BEN) and a porous clay heterostructure (PCH) functionalised with 3-aminopropyltriethoxysilane (APTES). FTIR, XPS and Mn chemical analysis confirm the C1 anchorage in both materials, but with higher efficiency in BEN_APTES clay. The catalytic activity of C1@BEN_APTES and C1@PCH_APTES, was assessed in the epoxidation of styrene (sty) and µ-methylstyrene (µ-Mesty) using NaOCl and m-chloroperoxybenzoic acid (m-CPBA)/N-methylmorpholine-N-oxide (NMO). Both materials behave as moderate catalysts, show high epoxide selectivity but low enantiomeric excesses. In the case of sty epoxidation with m-CBPA/NMO the C1@PCH_APTES catalyst showed the highest catalytic activity, whereas in µ-Mesty epoxidation, the C1@PCH_APTES catalyst, although leading to lower substrate conversion than the BEN analogue, presented the lowest complex leaching. In all cases, the oxidant NaOCl had some destructive effect in the hybrid catalysts, highlighting the importance of a careful choice of catalyst and oxidant system.

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Section: Textural Propertiessupporting

confidence: 89%

Anchoring of Chiral Manganese(III) Salen Complex onto Organo Clay and Porous Clay Heterostructure and Catalytic Activity in Alkene Epoxidation

et al. 2009

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“…Some studies on the synthesis of PCHs have reported the diffi culty of detecting the diffraction peaks when oriented and non-oriented samplers are used [28,48]. This is because, as already reported [49], such materials have low ordering and long range.…”

Section: Characterizationsmentioning

confidence: 98%

Porous heterostructured clays - recent advances and challenges - revisão

Schwanke

Pergher

2013

Cerâmica

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Porous heterostructured clays -PCHs -are lamellar solids with acid and adsorptive properties serving as catalysts or catalyst supports formed on a template mechanism. This work provides information about porous heterostructured clays. Historical aspects of the development of lamellar solids to porous heterostructured clays will be discussed, and detailed information on synthesis and applicationaspects, as well as on the infl uence of eachreagent on these materials and the characterization techniques used to prove their formation will be given. Keywords: porous heterostructured clays, PCHs, lamellar solids. Resumo Argilas porosas heteroestruturadas -PCHs -são sólidos lamelares com propriedades ácidas e adsortivas que servem de catalisadores ou suporte de catalisadores formados pelo mecanismo de gabarito. O presente trabalho traz informações sobre as argilas porosas heteroestruturadas -PCHs. Aspectos históricos sobre o desenvolvimento dos materiais lamelares até osPCHs são abordados, bem como informações detalhadas sobre aspectos de síntese, aplicações, a infl uência de cada reagente na formação destes materiais e as técnicas de caracterização essenciais utilizadas para comprovar a sua formação. Palavras-chave: argilas porosas heteroestruturadas, PCHs, sólidos lamelares.Cerâmica 59 (2013) 576-587

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“…The hysteresis loops suggested the characteristics of type IVa with meso-and macroporosity. The mixed features of type I and IV were most probably because the pore sizes of the PCHs were in the transition range from micro-to mesopores [17,40,46,47]. In addition, the layered textural character of the base clay was preserved, which was manifested by the unchanged H3 hysteresis loop of the curves for PCHs.…”

Section: Morphological and Structural Properties Of Pchsmentioning

confidence: 99%

A new insight into the compositional and structural control of porous clay heterostructures from the perspective of NMR and TEM

Wang

Zhang

Wen

et al. 2016

Microporous and Mesoporous Materials

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Characterization of the hydrophobicity of mesoporous silicas and clays with silica pillars by water adsorption and DRIFT

Cited by 51 publications

References 45 publications

Anchoring of Chiral Manganese(III) Salen Complex onto Organo Clay and Porous Clay Heterostructure and Catalytic Activity in Alkene Epoxidation

Anchoring of Chiral Manganese(III) Salen Complex onto Organo Clay and Porous Clay Heterostructure and Catalytic Activity in Alkene Epoxidation

Porous heterostructured clays - recent advances and challenges - revisão

A new insight into the compositional and structural control of porous clay heterostructures from the perspective of NMR and TEM

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