Rational Design of Microporous and Mesoporous Solids for Catalysis: From the Molecule to the Reactor

Louis, Benoît; Laugel, Guillaume; Pale, Patrick; Pereira, Marcelo Maciel

doi:10.1002/cctc.201100110

Cited by 36 publications

(21 citation statements)

References 117 publications

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“…[25] Two other MFI-type samples, named G1 and G2, have also been obtained by performing the zeolite syntheses at neutral pH through the non-conventional fluoride route, which led to large zeolite crystals. [26][27][28][29] For comparison purposes, an H-Y zeolite, named Y1, was synthesised according to a slightly modified reported procedure [30] (see the Supporting Information for details).…”

Section: Resultsmentioning

confidence: 99%

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Diels–Alder Reaction between Isoprene and Methyl Acrylate over Different Zeolites: Influence of Pore Topology and Acidity

et al. 2013

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The Diels–Alder reaction between isoprene and methyl acrylate over several zeolites was thoroughly investigated. ZSM‐5 zeolites provided the highest productivity in methyl 4‐methylcyclohex‐3‐enecarboxylate isomer, achieving 0.219 mmol product per mmol H+ in 1 hour. In addition, this study highlights the influence of ZSM‐5 zeolite’s Brønsted acidity and crystal size on its performance in the Diels–Alder reaction. An optimal configuration between the two reactants within the medium‐pore‐sized ZSM‐5 framework is obtained, thus suggesting the presence of a confinement effect.

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Section: Resultsmentioning

confidence: 99%

“…The non-conventional sugar-mediated route probably allowed different interactions and arrangements between Al species from the zeolite precursors and OH groups from the sugars during the crystal growth process. [28,43] However, all these zeolites are highly crystalline and exhibit the sole MFI topology.…”

Section: Materials Studymentioning

confidence: 99%

Diels–Alder Reaction between Isoprene and Methyl Acrylate over Different Zeolites: Influence of Pore Topology and Acidity

et al. 2013

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“…Besides, the crystal nucleus surface affects the self-assembly process and therefore the crystal growth. Moreover, an interaction between biomass derived-compounds and inorganic precursors is occurring during the ageing time (after the crystals are readily formed), probably via a continuous process of redissolution/recrystallization at longer synthesis times [35]. We highlight that this process is barely observed during ZSM-5 synthesis in the absence if biomass-derived compounds and only a moderate increase in SAR was achieved during ageing time.…”

Section: Resultsmentioning

confidence: 83%

Insights to Achieve a Better Control of Silicon-Aluminum Ratio and ZSM-5 Zeolite Crystal Morphology through the Assistance of Biomass

et al. 2016

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Abstract:The present study attempts to provide insights for both the chemical composition (Si/Al) and the crystal morphology of ZSM-5 zeolites while using biomass template compounds in the synthesis. The solution containing biomass-derivative compounds was obtained after treating biomass in a sodium hydroxide aqueous solution under reflux. The latter alkaline solution was used as a solvent for zeolite nuclei ingredients to form the gel phase under hydrothermal conditions (170˝C during 24, 48 or 72 h). This approach allowed for preparing MFI zeolites having a broad range of Si/Al ratio, i.e., from 25 to 150. Likewise, MFI crystals with different morphologies could be obtained, being different from the pristine zeolite formed in the absence of biomass.

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“…The intrinsic pore structures of zeolites, i.e., the pore opening dimensions, channel size, shape and inter-connectivity may affect their practical applications as molecules need to enter the channels to either be stored there or react and transform to other compounds. 8 The typically small sized channels (< 0.8 nm) and cavities (< 1.3 nm) of zeolites can offer size/shape selectivity and play a role as molecular sieves. On the other hand, they can impose diffusion limitations, which may hinder the large-sized reactants/products molecules from approaching/leaving the active sites in the pores, leading to lowered conversion or further reactions which prompt coke deposition and catalyst deactivation.…”

Section: Introductionmentioning

confidence: 99%

Mesostructured zeolites: bridging the gap between zeolites and MCM-41

et al. 2015

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Surfactant-templating is one of the most versatile and useful techniques to implement mesoporous systems into solid materials. Various strategies based on various interactions between surfactants and solid precursors have been explored to produce new structures. Zeolites are invaluable as size-and shape-selective solid acid catalysts. Nevertheless, their micropores impose limitations on the mass transport of bulky feed and/or product molecules. Many studies have attempted to address this by utilizing surfactant-assisting technology to alleviate the diffusion constraints. However, most efforts have failed due to micro/ mesopore phase separation. Recently, a new technique combining the uses of cationic surfactants and mild basic solutions was introduced to synthesise mesostructured zeolites. These materials sustain the unique characteristics of zeolites (i.e., strong acidity, crystallinity, microporosity, and hydrothermal stability), including tunable mesopore sizes and degrees of mesoporosity. The mesostructured zeolites are now commercially available through Rive Technology, and show superior performance in VGO cracking. This feature article provides an overview of recent explorations in the introduction of mesoporosity into zeolites using surfactant-templating techniques. Various porous materials, preparation methods, physical and catalytic properties of mesostructured zeolites will be discussed.

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Rational Design of Microporous and Mesoporous Solids for Catalysis: From the Molecule to the Reactor

Abstract: Figure 10. Rational design of microporous solids at the molecular level, via the crystal, up to the reactor scale.

Cited by 36 publications

References 117 publications

Diels–Alder Reaction between Isoprene and Methyl Acrylate over Different Zeolites: Influence of Pore Topology and Acidity

Diels–Alder Reaction between Isoprene and Methyl Acrylate over Different Zeolites: Influence of Pore Topology and Acidity

Insights to Achieve a Better Control of Silicon-Aluminum Ratio and ZSM-5 Zeolite Crystal Morphology through the Assistance of Biomass

Mesostructured zeolites: bridging the gap between zeolites and MCM-41

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