11-P-29 - New hydrophobic Ti-beta catalyst obtained by silylation and its catalytic performance for olefin epoxidation

Corma, Avelino; Dómine, Marcelo E.; Gaona, José A.; Navarro, Martí; Rey, Fernando; Valencia, Susana

doi:10.1016/s0167-2991(01)81434-8

Cited by 73 publications

(106 citation statements)

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“…For comparison with the in situ experiment with aluminium‐containing H‐USY(6), an in situ experiment looking at the reaction progress with Sn‐Beta as a Lewis acidic catalyst was performed (Figure ). Glycoside formation was significantly slower with Sn‐Beta compared with H‐USY(6), which is consistent with a strongly reduced Brønsted acidity . At 100 °C, methyl glucoside formation was not observed on the low hours timescale, whereas methyl fructoside formation following fructose formation was a slow process.…”

Section: Resultssupporting

confidence: 57%

“…By using short‐chain alcohols for carbohydrate conversion, the long‐term structure and functionality of zeolites can be maintained for repeated use . In addition, the Lewis acidity and hence activity of most zeolites is reduced in water, but is better retained in alcohols . An aldose–ketose isomerization by using commercial aluminium‐based zeolites has therefore recently been proposed in a one‐pot, two‐step process in methanol and water .…”

Section: Introductionmentioning

confidence: 99%

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Combined Function of Brønsted and Lewis Acidity in the Zeolite‐Catalyzed Isomerization of Glucose to Fructose in Alcohols

et al. 2016

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Glucose conversion via fructose to useful chemicals and fuels has attracted considerable attention. Isomerization of glucose to fructose can proceed along several different reaction pathways involving different sugar intermediates and isomeric forms. Presently, the roles of the substrate isomeric forms and of the catalyst properties remain incompletely understood. By using NMR spectroscopy, we elucidate the interplay of the catalyst active sites in converting monosaccharide forms to products, byproducts, and intermediates in alcohols.

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Section: Resultssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Combined Function of Brønsted and Lewis Acidity in the Zeolite‐Catalyzed Isomerization of Glucose to Fructose in Alcohols

et al. 2016

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“…These results show a lower intrinsic activity of Sn‐MCM‐41 with respect to Sn‐Beta for etherification, as also occurs with other Lewis acid catalyzed reactions 22. 23 Thus, by selecting the appropriate Sn‐molecular sieve catalyst a large variety of alcohols can be etherified with excellent conversions and selectivities (see Table 2)…”

Section: Etherification Of 1‐butanol (2) With Para‐methoxybenzyl Alcomentioning

confidence: 74%

A General Method for the Preparation of Ethers Using Water‐Resistant Solid Lewis Acids

Corma¹,

Renz²

2006

Angewandte Chemie

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Eine umweltfreundliche Kaskade: Wasserbeständige isolierte Lewis‐Säure‐Zentren im Gerüst von Molekularsieben sind ausgezeichnete allgemeine Katalysatoren für die Ethersynthese (siehe Schema). Auf dieser Grundlage wurde ein umweltfreundlicher Prozess für die Synthese von Feinchemikalien entwickelt, der eine Eintopfkaskade aus Meerwein‐Ponndorf‐Verley‐Reduktion und Veretherung umfasst.

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“…While these approaches are often highly efficient and eliminate the requirement of molecular hydrogen, they are often not as atom efficient as they perhaps appear. In the presence of a supported metal catalysts, the source of hydrogen likely comes from the reformation of the sacrificial alcohol, rather than the via Meerwein-Ponndorf-Verley reduction, which is observed over Snβ zeolite and amorphous zirconia catalysts [30,31] . It is therefore often the case that greater quantities of the sacrificial alcohol are consumed than substrate.…”

Section: Introductionmentioning

confidence: 99%

The hydrogenation of levulinic acid to γ-valerolactone over Cu–ZrO2 catalysts prepared by a pH-gradient methodology

Orlowski

Douthwaite

Iqbal

et al. 2019

Journal of Energy Chemistry

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Articles you may be interested inCO2 hydrogenation to methanol over Cu/CeO2 and Cu/ZrO2 catalysts: Tuning methanol selectivity via metal-support interaction Journal of Energy Chemistry 40, 22 (2020);In situ synthesis of biomass-derived Ni/C catalyst by self-reduction for the hydrogenation of levulinic acid to γ-valerolactone a b s t r a c t A novel pH gradient methodology was used to synthesise a series of Cu-ZrO 2 catalysts containing different quantities of Cu and Zr. All of the catalysts were highly selective to the desired product, γvalerolactone, and are considerably more stable than Cu-ZrO 2 catalysts prepared by other co-precipitation methods for this reaction. Characterisation and further investigation of these catalysts by XRD, BET, SEM and XPS provided insight into the nature of the catalytic active site and the physicochemical properties that lead to catalyst stability. We consider the active site to be the interface between Cu/CuO x and ZrO x and that lattice Cu species assist with the dispersion of surface Cu through the promotion of a strong metal support interaction. This enhanced understanding of the active site and roles of lattice and surface Cu will assist with future catalyst design. As such, we conclude that the activity of Cu-ZrO 2 catalysts in this reaction is dictated by the quantity of Cu-Zr interface sites.

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11-P-29 - New hydrophobic Ti-beta catalyst obtained by silylation and its catalytic performance for olefin epoxidation

Cited by 73 publications

References 0 publications

Combined Function of Brønsted and Lewis Acidity in the Zeolite‐Catalyzed Isomerization of Glucose to Fructose in Alcohols

Combined Function of Brønsted and Lewis Acidity in the Zeolite‐Catalyzed Isomerization of Glucose to Fructose in Alcohols

A General Method for the Preparation of Ethers Using Water‐Resistant Solid Lewis Acids

The hydrogenation of levulinic acid to γ-valerolactone over Cu–ZrO2 catalysts prepared by a pH-gradient methodology

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