Influence of framework silicon to aluminium ratio on aluminium coordination and distribution in zeolite Beta investigated by 27Al MAS and 27Al MQ MAS NMR

Abraham, Anuji; Lee, Song-Ho; Shin, Chae‐Ho; Hong, Suk Bong; Prins, R.; Bokhoven, Jeroen A. van

doi:10.1039/b401235f

Cited by 101 publications

(87 citation statements)

References 30 publications

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“…Consequently, it is the introduction of Mo species that leads to formation of a third framework Al(IV) c species and the subsequent appearance of nonframework Al 2 (MoO 4 ) 3 . This suggests that the Al atoms corresponding to peak Al(IV) c can be assigned to [30,31]. For the 4Mo/HB-30Al catalyst, along with the tetrahedral Al(IV) d in alumina, some Al(IV) a can be seen in the HBeta framework, with an increase in Al(IV) a /Al(IV) b ratio from 0.06 to 0.23.…”

Section: Al Mas and Two-dimensional Mq Mas Nmrmentioning

confidence: 93%

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

Zhang

Liu

et al. 2007

Journal of Catalysis

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Section: Al Mas and Two-dimensional Mq Mas Nmrmentioning

confidence: 93%

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

Zhang

Liu

et al. 2007

Journal of Catalysis

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“…This suggests that the Al atoms corresponding to peak Al(IV) c could be assigned to the distorted extra-framework tetrahedral aluminium similar to that observed by van Bokhoven et al in the hydrothermal treatment of HBeta zeolites. 131,132 For the 4Mo/HB-30Al catalyst besides the tetrahedral Al(IV) d in alumina a part of Al(IV) a can still be observed in the HBeta framework, and the ratio of Al(IV) a /Al(IV) b increases from 0.06 to 0.23. At the same time the peak belonging to the distorted tetrahedral Al(IV) c is not so evident as that in the 4Mo/HB catalyst.…”

Section: 121mentioning

confidence: 99%

In situsolid-state NMR for heterogeneous catalysis: a joint experimental and theoretical approach

et al. 2012

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In situ solid-state NMR is a well-established tool for investigations of the structures of the adsorbed reactants, intermediates and products on the surface of solid catalysts. The techniques allow identifications of both the active sites such as acidic sites and reaction processes after introduction of adsorbates and reactants inside an NMR rotor under magic angle spinning (MAS). The in situ solid-state NMR studies of the reactions can be achieved in two ways, i.e. under batch-like or continuous-flow conditions. The former technique is low cost and accessible to the commercial instrument while the latter one is close to the real catalytic reactions on the solids. This critical review describes the research progress on the in situ solid-state NMR techniques and the applications in heterogeneous catalysis under batch-like and continuous-flow conditions in recent years. Some typical probe molecules are summarized here to detect the Brønsted and Lewis acidic sites by MAS NMR. The catalytic reactions discussed in this review include methane aromatization, olefin selective oxidation and olefin metathesis on the metal oxide-containing zeolites. With combining the in situ MAS NMR spectroscopy and the density functional theoretical (DFT) calculations, the intermediates on the catalyst can be identified, and the reaction mechanism is revealed. Reaction kinetic analysis in the nanospace instead of in the bulk state can also be performed by employing laser-enhanced MAS NMR techniques in the in situ flow mode (163 references).

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“…10 shows 27 Al NMR spectra of as-synthesized and calcined Beta-SDS 140 , Beta-SDS 120-1 , and Beta-TEA. Notably, as-synthesized three samples only exhibit the band at 54-58 ppm, which is characteristic of tetrahedrally coordinated aluminum species in the framework of Beta zeolite [54]. After calcination, Beta-TEA shows an additional weak band at near 0 ppm associated with octahedrally coordinated aluminum species, while Beta-SDS 120-1 and Beta-SDS 140 samples still give pure tetrahedrally coordinated Al species.…”

Section: Rational Synthesis Of Beta-sds Zeolitementioning

confidence: 99%

Rational synthesis of Beta zeolite with improved quality by decreasing crystallization temperature in organotemplate-free route

Zhang

Xie

Meng

et al. 2013

Microporous and Mesoporous Materials

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Influence of framework silicon to aluminium ratio on aluminium coordination and distribution in zeolite Beta investigated by 27Al MAS and 27Al MQ MAS NMR

Cited by 101 publications

References 30 publications

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

The role of alumina in the supported Mo/HBeta–Al2O3 catalyst for olefin metathesis: A high-resolution solid-state NMR and electron microscopy study

In situsolid-state NMR for heterogeneous catalysis: a joint experimental and theoretical approach

Rational synthesis of Beta zeolite with improved quality by decreasing crystallization temperature in organotemplate-free route

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