Catalytic activation of all-silica COK-14 zeolite through alumination and particle size reduction using wet ball milling

Prins, Michiel De; Verheyen, Elke; Vanbutsele, Gina; Sree, Sreeprasanth Pulinthanathu; Thomas, Karine; Gilson, Jean‐Pierre; Zhang, Fei; Kirschhock, Christine; Martens, Johan A.

doi:10.1016/j.cattod.2019.03.016

Cited by 9 publications

(7 citation statements)

References 51 publications

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“…A low liquid/solid ratio of 25 ml per 0.5 g of parent zeolite was chosen, which has been recently reported to yield good results at high temperatures. 46 Several solvents were tested initially and their results showed the need for the presence of acid or water for successful hydrolysis, as neither solvent-free nor the use of "non-hydrolytic" solvents such as ethanol led to a breakdown of the UTL framework (see Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

“…44,45 Additionally, mechanochemical treatment has been shown to yield zeolite catalysts with good performance, for example through simultaneous particle size reduction during alumination. 46 The established knowledge about the ADOR process has been compiled in a recent review, 47 yet further insight into the underlying fundamental principles is necessary. In particular, the disassembly step is currently being investigated, 22,23,48 as it is probably the most crucial of the entire process.…”

Section: Mechanochemical Methods In Zeolite Chemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanochemically assisted hydrolysis in the ADOR process

et al. 2020

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Section: Resultsmentioning

confidence: 99%

Section: Mechanochemical Methods In Zeolite Chemistrymentioning

confidence: 99%

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Mechanochemically assisted hydrolysis in the ADOR process

et al. 2020

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“…Once again, Brønsted acid sites were generated in the aluminated sample, which is the basis for improved catalytic activity in n-decane hydroisomerization and hydrocracking with respect to ALD-COK-14. In n-decane hydroisomerization reaction remarkably high selectivity of skeletal isomers (72%) was reached, uncommon for large pore zeolites [289].…”

Section: Post-synthesis Aluminium Incorporationmentioning

confidence: 99%

Analysis and control of acid sites in zeolites

Palčić

Valtchev

2020

Applied Catalysis A: General

104

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The exceptional catalytic performance of zeolites is due to the presence of active sites in a shape-selective environment, i.e., in micropores with molecular dimensions. The present review provides a comprehensive analysis of active sites in zeolite frameworks. It is focused on the active sites generated by the Al incorporation in the framework. The inclusion of other heteroatoms in the zeolite framework is also addressed. After the introduction of zeolite-type materials and a discussion of the structure-properties relationship in zeolites the central part of the review is devoted to i) the analytical methods and their complementarity for the evaluation of the number, strength, and position of active sites and ii) the in situ and post-synthesis methods of acid sites assessment and control. The data presented herein provide guidelines for making zeolite materials by design in terms of acidity.

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“…However, direct introduction of aluminum into ‐COK‐14 was hardly achieved by treating with an aqueous aluminate solution under hydrothermal conditions, or exposure to aluminum halide vapour/aluminum isopropoxide. Fortunately, aluminum ALD has been certified as an effective strategy to obtain acid sites in nanoporous structures [133] . For instance, Martens et al.…”

Section: Fabrication Of Acid Sites On Zeolites By Aldmentioning

confidence: 99%

Atomic‐Scale Designing of Zeolite Based Catalysts by Atomic Layer Deposition

Yin

Gao

et al. 2021

ChemPhysChem

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Zeolite‐supported catalysts have been widely used in the field of heterogeneous catalysis. Atomic‐scale governing the metal or acid sites on zeolites still encounters great challenge in controllable synthesis and developing of novel catalysts. Atomic layer deposition (ALD), owing to its unique character of self‐limiting surface reactions, becomes one of the most promising and controllable strategies to tailor the metallic deposition sites in atomic scale precisely. In this review, we present a comprehensive summary and viewpoint of recent research in designing and engineering the structural of zeolite‐based catalysts via ALD method. A prior focus is laid on the deposition of metals on the zeolites with emphasis on the isolated states of metals, followed by introducing the selected metals into channels of zeolites associates with identifying the location of metals in and/or out of the channels. Subsequently, detailed analysis of tailoring the acid sites of different zeolites is provided. Assisted synthesis of zeolite and the regioselective deposition of metal on special sites to modify the structures of zeolites are also critically discussed. We further summarize the challenges of ALD with respect to engineering the active sites in heterogeneous zeolite‐based catalysts and provide the perspectives on the development in this field.

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Catalytic activation of all-silica COK-14 zeolite through alumination and particle size reduction using wet ball milling

Cited by 9 publications

References 51 publications

Mechanochemically assisted hydrolysis in the ADOR process

Mechanochemically assisted hydrolysis in the ADOR process

Analysis and control of acid sites in zeolites

Atomic‐Scale Designing of Zeolite Based Catalysts by Atomic Layer Deposition

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