Chemical and thermal stability of dealuminated faujasite-type zeolites in gaseous and aqueous phases

Briend-Faure, M.; Cornu, O.; Delafosse, D.; Monque, R.; Peltre, M.J.

doi:10.1016/s0166-9834(00)80987-2

Cited by 25 publications

(4 citation statements)

References 16 publications

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“…Several works have focused on studying the relative stability of faujasites under various conditions. In agreement with Briend et al, 74 Verboekend et al 73 showed that faujasites with a low Si/Al ratio (parent X and Y zeolites) are relatively stable in alkaline solutions (in atmospheric liquid water), whereas those with Si/Al 4 4 are very sensitive, as they dissolve and amorphize under the same conditions. It should be highlighted that once controlled (using NH 4 OH), this amorphisation enables to introduce intracrystalline mesoporosity, while virtually no silica is leached from the solid based on a partial densification of the solid (Fig.…”

Section: Understanding the Mechanism Of Mesopore Formationsupporting

confidence: 83%

Synthesis, characterisation, and catalytic evaluation of hierarchical faujasite zeolites: milestones, challenges, and future directions

et al. 2016

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Faujasite (X, Y, and USY) zeolites represent one of the most widely-applied and abundant catalysts and sorbents in the chemical industry. In the last 5 years substantial progress was made in the synthesis, characterisation, and catalytic exploitation of hierarchically-structured variants of these zeolites. Hererin, we provide an overview of these contributions, highlighting the main advancements regarding the evaluation of the nature and functionality of introduced secondary porosity. The novelty, efficiency, versatility, and sustainability of the reported bottom-up and (predominately) top-down strategies are discussed. The crucial role of the relative stability of faujasites in aqueous media is highlighted. The interplay between the physico-chemical properties of the hierarchical zeolites and their use in petrochemical and biomass-related catalytic processes is assessed.

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Section: Understanding the Mechanism Of Mesopore Formationsupporting

confidence: 83%

Synthesis, characterisation, and catalytic evaluation of hierarchical faujasite zeolites: milestones, challenges, and future directions

et al. 2016

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“…[386][387][388] This is in sharp contrast with dealumination, the dominant phenomenon under steaming. [108][109][110][111] So, the stability of zeolites in HLW resembles more the stability trends observed in alkaline ALW than those observed under steaming conditions, which are on their turn quite similar to the trends at acidic ALW (Fig. 12).…”

Section: Stability Of Zeolites In Neutral Hlwsupporting

confidence: 60%

“…Due to the manifold use of zeolites in gas phase processes, the dynamics and stability of the catalytic sites under such conditions are well-known. [108][109][110][111] The nature of the sites directly determines the intrinsic strength of the sites. Brønsted acid sites are highly polarised hydroxyl groups, while Lewis acid sites are coordinatively unsaturated cationic sites accepting electron pairs of guest molecules.…”

Section: Liquid Phase Catalytic Conversion Of Sugar-derived Compoundsmentioning

confidence: 99%

“…262 Early investigations have already shown that the behaviour of zeolites in HLW is remarkable different with that under steaming conditions. While steaming at 200 1C has minor influence on the zeolite integrity, 111 treatment in HLW at the same temperature shows tremendous changes in zeolite structure and properties. 262,263 Recently, it was shown that degradation of zeolite Y in neutral, and even in slightly acidified, HLW mostly occurs through hydrolysis of Si-O-Si bonds, 262,263,386 initiated at silanol defects.…”

Section: Stability Of Zeolites In Neutral Hlwmentioning

confidence: 99%

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Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

et al. 2016

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Increasing demand for sustainable chemicals and fuels has pushed academia and industry to search for alternative feedstocks replacing crude oil in traditional refineries. As a result, an immense academic attention has focused on the valorisation of biomass (components) and derived intermediates to generate valuable platform chemicals and fuels. Zeolite catalysis plays a distinct role in many of these biomass conversion routes. This contribution emphasizes the progress and potential in zeolite catalysed biomass conversions and relates these to concepts established in existing petrochemical processes. The application of zeolites, equipped with a variety of active sites, in Brønsted acid, Lewis acid, or multifunctional catalysed reactions is discussed and generalised to provide a comprehensive overview. In addition, the feedstock shift from crude oil to biomass involves new challenges in developing fields, like mesoporosity and pore interconnectivity of zeolites and stability of zeolites in liquid phase. Finally, the future challenges and perspectives of zeolites in the processing of biomass conversion are discussed.

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Zeolites

Roland

Kleinschmit

2000

Ullmann's Encyclopedia of Industrial Chemistry

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Chemical and thermal stability of dealuminated faujasite-type zeolites in gaseous and aqueous phases

Cited by 25 publications

References 16 publications

Synthesis, characterisation, and catalytic evaluation of hierarchical faujasite zeolites: milestones, challenges, and future directions

Synthesis, characterisation, and catalytic evaluation of hierarchical faujasite zeolites: milestones, challenges, and future directions

Potential and challenges of zeolite chemistry in the catalytic conversion of biomass

Zeolites

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