Science and Technology of Framework Metal-Containing Zeotype Catalysts

Németh, László; Bare, Simon R.

doi:10.1016/b978-0-12-800127-1.00001-1

Cited by 24 publications

(28 citation statements)

References 244 publications

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“…In this section, the catalytic properties of subnanometric metal entities confined in zeolites and MOFs for a variety of heterogeneous catalytic reactions will be discussed. It should be mentioned that, the metal-zeolite materials to be discussed in this section will be mainly focused on extra-framework metal species confined in zeolite structures since the reactivities of framework-type metal-zeolite materials have already been covered in previous reviews 122 . While subnanometric metal entities bonded to both the nodes and linkers in MOF structures will be discussed.…”

Section: Catalysis Of Confined Catalystsmentioning

confidence: 99%

Confining isolated atoms and clusters in crystalline porous materials for catalysis

2020

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The recent works on supported isolated metal atoms and metal clusters with a few atoms have reformed our understanding on the structure-reactivity relationship established on conventional nanoparticulate catalysts. One critical issue related to supported subnanometric metal catalysts (including both isolated atoms and clusters) on conventional open-structure carriers is the stability of the metal entities, since they may sinter into large nanoparticles under harsh reaction conditions. By confining the isolated metal atoms or subnanometric metal clusters in crystalline porous materials (such as zeolites and metal-organic frameworks) can improve the stability of these tiny species against sintering into nanoparticles. More importantly, the interaction between the metal species and the porous framework may modulate the geometric and electronic structures of the subnanometric metal species, especially in the cases of metal clusters. Such confinement effect can induce shape-selective catalysis or unique chemoselectivity compared to the counterpart metal entities supported on conventional open-structure solid carriers. In this review, we will discuss the structural features, synthesis methodologies, characterization techniques and catalytic applications of subnanometric species confined in zeolites and metal-organic frameworks, aiming to make critical comparison between confined and un-confined isolated atoms and metal clusters and to give perspectives on the future developments.

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Section: Catalysis Of Confined Catalystsmentioning

confidence: 99%

Confining isolated atoms and clusters in crystalline porous materials for catalysis

2020

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“…Finally, a significant number of articles mentions the term "surface". Although this is mostly done in the context of probing the Potential Energy Surface (PES), a significant number of sources also contain the terms "immobilized" (12 entries) or "anchored" (seven entries), denoting the growing interest in the theoretical study of novel materials with catalytic activities in which these complexes are immobilized into a nanostructured matrix [25][26][27].…”

Section: Statistical Meta-analysismentioning

confidence: 99%

Strengths, Weaknesses, Opportunities and Threats: Computational Studies of Mn- and Fe-Catalyzed Epoxidations

Teixeira

Cordeiro

2016

Catalysts

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Abstract:The importance of epoxides as synthetic intermediates in a number of highly added-value chemicals, as well as the search for novel and more sustainable chemical processes have brought considerable attention to the catalytic activity of manganese and iron complexes towards the epoxidation of alkenes using non-toxic terminal oxidants. Particular attention has been given to Mn(salen) and Fe(porphyrin) catalysts. While the former attain remarkable enantioselectivity towards the epoxidation of cis-alkenes, the latter also serve as an important model for the behavior of cytochrome P450, thus allowing the exploration of complex biological processes. In this review, a systematic survey of the bibliographical data for the theoretical studies on Mn-and Fe-catalyzed epoxidations is presented. The most interesting patterns and trends are reported and finally analyzed using an evaluation framework similar to the SWOT (Strengths, Weaknesses, Opportunities and Threats) analysis performed in enterprise media, with the ultimate aim to provide an overview of current trends and areas for future exploration.

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“…Researchers have long explored the development of such isolated active sites through isomorphous substitution within aluminosilicates (zeolites) and aluminophosphates (AlPOs), since their conception in 1982 [8]. The introduction of a range of transition-metal dopants was explored within zeolites for a wide variety of oxidation and acid-catalysed transformations [9][10][11][12]. One of the most striking examples was the discovery of titanosilicate-1 (TS-1), where isomorphous replacements of Si(IV) with small quantities (ca 2 atom per cent) of tetrahedral Ti(IV) species, catalysed a range of industrially significant, selective oxidation reactions (e.g.…”

Section: Introduction and Design Strategymentioning

confidence: 99%

Influence of dopant substitution mechanism on catalytic properties within hierarchical architectures

et al. 2016

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A range of hierarchically porous (HP) AlPO-5 catalysts, with isomorphously substituted transition metal ions, have been synthesized using an organosilane as a soft template. By employing a range of structural and spectroscopic characterization protocols, the properties of the dopant-substituted species within the HP architectures have been carefully evaluated. The resulting nature of the active site is shown to have a direct impact on the ensuing catalytic properties in the liquid-phase Beckmann rearrangement of cyclic ketones.

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Science and Technology of Framework Metal-Containing Zeotype Catalysts

Cited by 24 publications

References 244 publications

Confining isolated atoms and clusters in crystalline porous materials for catalysis

Confining isolated atoms and clusters in crystalline porous materials for catalysis

Strengths, Weaknesses, Opportunities and Threats: Computational Studies of Mn- and Fe-Catalyzed Epoxidations

Influence of dopant substitution mechanism on catalytic properties within hierarchical architectures

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