Synthesis and characterization of the magnesium silicoaluminophosphates MAPSO-43 and MAPSO-39

Akporiaye, Duncan; Andersen, A. P.; Dahl, Ivar M.; Mostad, Helle B.; Wendelbo, Rune

doi:10.1021/j100038a055

Cited by 24 publications

(28 citation statements)

References 2 publications

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“…Both samples are dominated by a peak at ca. 36 ppm, which is typical for 27 Al chemical shift, relating to tetrahedrally coordinated Al in AlPO-5 based materials. 24 However, the position of this peak is slightly shifted to a higher chemical shift for 6%CoSn-700C sample, which could be as a result of the successful substitution of Al(III) sites by Co species in this sample.…”

Section: Sn Mas Nmrmentioning

confidence: 89%

“…119 Sn, 31 P and 27 27 Al spectra, respectively (see ESI file for detailed experimental conditions). DR UV/Vis spectra were collected using a UV-Vis 2600 spectrometer with an integrated sphere in the range of 200-800 nm.…”

Section: Characterizationmentioning

confidence: 99%

“…As with the DR UV-Vis analysis, the 119 Sn MAS NMR spectra show an evidence for multiple Sn species, with the strongest evidence for framework Sn sites present for the 3%Sn-700C sample. 27 Al MAS NMR Fig. 3B (curves a and b) displays the 27 Al MAS NMR spectra of 3%Sn-700C and 6%CoSn-700C catalysts, respectively.…”

Section: Sn Mas Nmrmentioning

confidence: 99%

“…27 Al MAS NMR Fig. 3B (curves a and b) displays the 27 Al MAS NMR spectra of 3%Sn-700C and 6%CoSn-700C catalysts, respectively. Both samples are dominated by a peak at ca.…”

Section: Sn Mas Nmrmentioning

confidence: 99%

“…Structural and spectroscopic techniques were used to probe the nature of the solid-acid sites, at the molecular level, using a combination of XRD, DR UV-Vis, solid state MAS NMR ( 119 Sn, 27 Al and 31 P) and XAFS. The nature and strength of the solidacid sites were experimentaly probed by FT-IR spectroscopy using CD3CN as a probe molecule.…”

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confidence: 99%

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Design and control of Lewis acid sites in Sn-substituted microporous architectures

et al. 2016

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Monometallic and bimetallic tin-containing framework architectures have been prepared by hydrothermal methods. Structural and spectroscopic techniques were used to probe the nature of the solid-acid sites, at the molecular level, using a combination of XRD, DR UV-Vis, solid state MAS NMR ( 119 Sn, 27 Al and 31 P) and XAFS. The nature and strength of the solidacid sites were experimentaly probed by FT-IR spectroscopy using CD3CN as a probe molecule. To elucidate further the localstructure, the structural characteristics of the Sn sites were probed using DFT calculations, with a view to rationalising the experimental findings. These detailed structural and spectroscopic studies revealed the presence of multiple Sn environments, with the monometallic SnAlPO-5 catalyst displaying a greater number of tetrahedral Sn(IV) active centres. These framework Sn(IV) centres generated stong Lewis acid sites, when compared with their bimetallic Co-Sn analogue, thereby affording attractive possibilities for modulating catalytic reactivity. IntroductionTetrahedral (Td) sites in microporous solids are widely reported as catalytic active centres in selective oxidation and acidcatalysed transformations, 1-4 of which Ti in TS-1, 5 Fe in ZSM-5 6 and Co in AlPO-5 7 are significant examples. Controlling the nature of these active sites allows one to tune the Lewis 8 and Brønsted acidity, 9 and regulate redox 10 centres for oxidation catalysis. The addition of a second heteroatom allows for further optimisation of these properties, as well as influencing the coordination geometry of the initial heteroatom. [2][3][4] The incorporation of Sn into zeolitic 11 and non-zeolitic 1,4 architectures has received significant attention for its promising performance in Baeyer-Villiger oxidations. 11 The activity of these systems was correlated with the presence of Sn in Td sites, with well isolated Lewis acidic centres, which can be used for a wide range of catalytic reactions. [11][12][13] The synthetic findings were supported by a large number of characterization techniques, including DR UV-Vis, 119 Sn MAS NMR and in situ IR spectroscopy. 11,14 Although such materials could be expected to show significant catalytic functionality, the incorporation of Sn into AlPO-5 frameworks in Td sites is, however, very limited and poorly understood.This work focuses on the isomorphous substitution of P(V) with Sn (IV) within AlPO-5 using a modified hydrothermal preparation method. 4 Cobalt (Co 2+ /Co 3+ ) ions can be simultaneously introduced into the AlPO-5 architecture 2,3,15 by the substitution of (Al 3+ ) sites. Recently, a combined DFT and EXAFS study demonstrated the potential of effecting catalytic synergy in Co−Ti bimetallic nanoporous frameworks. 16 However, the prospects of introducing a relatively heavier element like Sn, alongside a redox transition-metal such as Co, could pave the way for probing bifunctional catalytic transformations. Nevertheless, the structural and spectroscopic features of such a system needs to be probed in meticulous detail...

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Section: Sn Mas Nmrmentioning

confidence: 89%

Section: Characterizationmentioning

confidence: 99%

Section: Sn Mas Nmrmentioning

confidence: 99%

“…27 Al MAS NMR Fig. 3B (curves a and b) displays the 27 Al MAS NMR spectra of 3%Sn-700C and 6%CoSn-700C catalysts, respectively. Both samples are dominated by a peak at ca.…”

Section: Sn Mas Nmrmentioning

confidence: 99%

mentioning

confidence: 99%

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Design and control of Lewis acid sites in Sn-substituted microporous architectures

et al. 2016

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Synthesis of ATN‐Type FeAPO‐39 Molecular Sieves without Solvent using the Additional Structure‐Directing Effect of the Iron Source

et al. 2018

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ATN-type FeAPO-39 molecular sieves with high iron content has been successfully synthesized under non-solvent conditions, which is the first example of iron-incorporated aluminophosphate with the ATN-zeotype structure. The optimum synthetic conditions of this material were refined. It was found that the following synthetic conditions, i.e. a low P 2 O 5 /Al 2 O 3 ratio, a high DPA/Al 2 O 3 ratio (DPA: di-n-propylamine) and an elevated crystallization temperature, seemed to be more favorable for the non-solvent synthesis of ATN phase. The composition and structural characteristics of resultant relatively pure FeAPO-39 molecular sieves were intensively studied by XRD, FT-IR, TG-DTA, CHN elemental analysis, ICP-AES, SEM, TEM, [a]

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Atn

Baur¹,

Fischer²

Zeolite Structure Codes ABW to CZP

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Synthesis and characterization of the magnesium silicoaluminophosphates MAPSO-43 and MAPSO-39

Cited by 24 publications

References 2 publications

Design and control of Lewis acid sites in Sn-substituted microporous architectures

Design and control of Lewis acid sites in Sn-substituted microporous architectures

Synthesis of ATN‐Type FeAPO‐39 Molecular Sieves without Solvent using the Additional Structure‐Directing Effect of the Iron Source

Atn

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