Mesostructured zeolite Y—high hydrothermal stability and superior FCC catalytic performance

García‐Martínez, Javier; Johnson, Marvin F. L.; Valla, Julia A.; Li, Kunhao; Ying, Jackie Y.

doi:10.1039/c2cy00309k

Cited by 315 publications

(361 citation statements)

References 51 publications

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“…For the more extensively treated H-USY-D sample, also a signifi cant decrease of the strongest acid site fraction, which still chemisorbs pyridine at 623 K, is observed. These changes are not surprising as 27 Al MAS NMR reveals a transformation of the present Al species ( Figure S4b, Supporting Information). The decrease of the Brønsted acid density can be ascribed to a decrease of tetrahedrally coordinated framework Al (63 ppm).…”

Section: Structure and Aciditymentioning

confidence: 73%

“…[ 26 ] Furthermore, a mesostructured zeolite USY was successfully synthesized by a hydrothermal NH 4 OH treatment. [ 27 ] However, cetyltrimethyl ammonium (CTA + ) addition as a structure-directing agent was necessary, which needs to be removed by combustion. Later, it was suggested that these mesostructured materials are best described as zeolite/OMM (ordered mesoporous materials) composites.…”

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confidence: 99%

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Catalyst Design by NH₄OH Treatment of USY Zeolite

Aelst

Verboekend

Philippaerts

et al. 2015

Adv Funct Materials

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Hierarchical zeolites are a class of superior catalysts which couples the intrinsic zeolitic properties to enhanced accessibility and intracrystalline mass transport to and from the active sites. The design of hierarchical USY (Ultra‐Stable Y) catalysts is achieved using a sustainable postsynthetic room temperature treatment with mildly alkaline NH4OH (0.02 m) solutions. Starting from a commercial dealuminated USY zeolite (Si/Al = 47), a hierarchical material is obtained by selective and tuneable creation of interconnected and accessible small mesopores (2–6 nm). In addition, the treatment immediately yields the NH4+ form without the need for additional ion exchange. After NH4OH modification, the crystal morphology is retained, whereas the microporosity and relative crystallinity are decreased. The gradual formation of dense amorphous phases throughout the crystal without significant framework atom leaching rationalizes the very high material yields (>90%). The superior catalytic performance of the developed hierarchical zeolites is demonstrated in the acid‐catalyzed isomerization of α‐pinene and the metal‐catalyzed conjugation of safflower oil. Significant improvements in activity and selectivity are attained, as well as a lowered susceptibility to deactivation. The catalytic performance is intimately related to the introduced mesopores, hence enhanced mass transport capacity, and the retained intrinsic zeolitic properties.

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Section: Structure and Aciditymentioning

confidence: 73%

mentioning

confidence: 99%

Catalyst Design by NH₄OH Treatment of USY Zeolite

Aelst

Verboekend

Philippaerts

et al. 2015

Adv Funct Materials

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“…For the single-phase mesostructured materials derived from the ''single-step'' approach, evenly distributed non-order mesopores were observed throughout the crystal (as confirmed in ultramicrotomed samples). 86 In contrast, two-phase materials (i.e., well-ordered mesochannel MCM-41-microporous zeolite composites) were observed in the samples prepared using the ''two-step'' approach. 91 Y-zeolites have been extensively used as catalysts for hydrocarbon processing in refineries.…”

Section: View Article Onlinementioning

confidence: 86%

“…In 2005, Garcia-Martinez et al [84][85][86][87][88] introduced a unique post-synthesis technique to make fully crystalline zeolites (i.e., Y, MOR, and ZSM-5) with well controlled mesoporosity using surfactants. The sizes of the introduced mesopores are directed by the sizes of the surfactants used, and have very narrow pore-size distributions compared to the ones obtained from a conventional desilication process.…”

Section: Surfactant-templated Zeolitesmentioning

confidence: 99%

Mesostructured Zeolites: Bridging the Gap Between Zeolites and MCM-41

García-Martínez¹

2015

ChemViews

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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 shapeselective 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 surfactantassisting 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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“…Additionally, this compound is a source of monomers from other compounds such as lactic acid esters, acrylic acid, 1,2-propanodiol, acetaldehyde, propionic acid, oxalic acid and biodegradable plastics-PLA (polylactic acid) so-called "green polymers" [10][11][12][13][14]. In industry, lactic acid is mainly obtained as a result of glucose or sucrose fermentation using microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Isomerization of Dihydroxyacetone to Lactic Acid and Alkyl Lactates over Hierarchical Zeolites Containing Tin

et al. 2018

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Hierarchical zeolites containing tin were obtained, characterized and used in a reaction of catalytic isomerization of dihydroxyacetone (DHA) to lactic acid and alkyl lactates. These catalysts are characterized by preserved crystallinity and primary microporosity with the simultaneous existence of secondary porosity regarding mesopores, which facilitates access of large molecules of reagents to active centers. Creation of additional porosity was confirmed by X-ray diffraction and low-temperature nitrogen adsorption/desorption studies. The reaction of dihydroxyacetone isomerization was conducted in different reaction media such as methanol, ethanol or water with the use of two heating methods: microwave radiation and conventional heating. The application of microwave radiation enabled to reduce the reaction time to 1 h and achieve dihydroxyacetone conversion of >90% and high yields of the desired reaction products.

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Mesostructured zeolite Y—high hydrothermal stability and superior FCC catalytic performance

Cited by 315 publications

References 51 publications

Catalyst Design by NH₄OH Treatment of USY Zeolite

Catalyst Design by NH₄OH Treatment of USY Zeolite

Mesostructured Zeolites: Bridging the Gap Between Zeolites and MCM-41

Catalytic Isomerization of Dihydroxyacetone to Lactic Acid and Alkyl Lactates over Hierarchical Zeolites Containing Tin

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Mesostructured zeolite Y—high hydrothermal stability and superior FCC catalytic performance

Cited by 315 publications

References 51 publications

Catalyst Design by NH4OH Treatment of USY Zeolite

Catalyst Design by NH4OH Treatment of USY Zeolite

Mesostructured Zeolites: Bridging the Gap Between Zeolites and MCM-41

Catalytic Isomerization of Dihydroxyacetone to Lactic Acid and Alkyl Lactates over Hierarchical Zeolites Containing Tin

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Catalyst Design by NH₄OH Treatment of USY Zeolite

Catalyst Design by NH₄OH Treatment of USY Zeolite