2019
DOI: 10.1016/j.apcata.2019.03.009
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Synthesis and catalytic testing of Lewis acidic nano zeolite Beta for epoxide ring opening with alcohols

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Cited by 24 publications
(30 citation statements)
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“…The in situ preparation of nanosized Sn-zeolites was the extension of this work in terms of the substrate size. Namely, nanosized Sn-MFI (Si/Sn = 200) and Sn-Beta (Si/Sn = 170) exceeded the catalytic activity of corresponding Sn-zeolite materials with larger crystals in the reactions of 1,2-epoxyhexane with methanol and 1,2-epoxyoctane with ethanol, respectively [337,338]. A series of Sn-Al-MOR samples with Si/Sn in the range ∞-143 and Si/Al = 12-9 was prepared in the presence of 1-butyl-3-methylimidazolium bromide.…”
Section: Tin-containing Zeolitesmentioning
confidence: 99%
“…The in situ preparation of nanosized Sn-zeolites was the extension of this work in terms of the substrate size. Namely, nanosized Sn-MFI (Si/Sn = 200) and Sn-Beta (Si/Sn = 170) exceeded the catalytic activity of corresponding Sn-zeolite materials with larger crystals in the reactions of 1,2-epoxyhexane with methanol and 1,2-epoxyoctane with ethanol, respectively [337,338]. A series of Sn-Al-MOR samples with Si/Sn in the range ∞-143 and Si/Al = 12-9 was prepared in the presence of 1-butyl-3-methylimidazolium bromide.…”
Section: Tin-containing Zeolitesmentioning
confidence: 99%
“…Similarly, acting as both reactant and reaction medium, water is also expected to have a positive effect on the epoxide hydration. When encountering an attack by some nucleophilic reagents, e.g., water, amines, alcohols, and sulfides, etc., the C–O bond in the three-membered heterocycle of the epoxide tends to be broken and thus forms a stable addition compound. , Figure b gives the catalytic results of the cyclohexene oxide hydration with different ratios of water/epoxide (2/1, 5/1, 10/1, 20/1, and 40/1). The hydration reaction was greatly accelerated by increasing the relative ratio of water, and the TOF also reached a high value of 122.2 mol diol ·mol Fe –1 ·h –1 when n (water)/ n (epoxide) = 40/1 was selected, which is nearly 8 times higher than that using n (water)/ n (epoxide) = 2/1.…”
Section: Resultsmentioning
confidence: 99%
“…When encountering an attack by some nucleophilic reagents, e.g., water, amines, alcohols, and sulfides, etc., the C− O bond in the three-membered heterocycle of the epoxide tends to be broken and thus forms a stable addition compound. 47,48 Figure 6b gives the catalytic results of the cyclohexene oxide hydration with different ratios of water/ epoxide (2/1, 5/1, 10/1, 20/1, and 40/1). The hydration reaction was greatly accelerated by increasing the relative ratio of water, and the TOF also reached a high value of 122.2 mol diol •mol Fe −1…”
mentioning
confidence: 99%
“…In the case of the alumina support, the limited activity seems to be due to a poisoning of the catalytic site, most likely by strongly coordinated chelating ligands as β-methoxy alcohols and diols. It is known that the most electrophilic Lewis acid sites can catalyze the opening of an epoxide at moderate temperatures. On the alumina support, the most electrophilic cationic C type Ti sites may play this role, thus producing β-alkoxy alcohol chelating ligands strongly adsorbed on Ti sites that would lead to a deactivation of the catalyst. On the other hand, the presence of water or the resulting Ti–OH groups has been proposed for the ring opening of epoxides and the formation of diols that tend to deactivate the catalyst. The formation of water may come from the reaction of t BuOH or TBHP with residual Al S OH groups of alumina to form Al S –OR or Al S –OOR surface species.…”
Section: Resultsmentioning
confidence: 99%
“…It is known that the most electrophilic Lewis acid sites can catalyze the opening of an epoxide at moderated temperatures. [58][59][60][61] On the alumina support, the most electrophilic cationic C type Ti sites may play this role, thus producing β-alkoxy alcohols chelating ligands strongly adsorbed on Ti sites that would lead to a deactivation of the catalyst. On another hand, the presence of water or resulting ≡Ti-OH groups has been proposed for the ring opening of epoxides and the formation of diols that tend to deactivate the catalyst.…”
Section: -Octene Epoxidationmentioning
confidence: 99%