Low‐Temperature Preparation of a Mesoporous Silica Superbase by Employing the Multifunctionality of a La<sub>2</sub>O<sub>3</sub> Interlayer

Liu, Ning; Wu, Zhimin; Li, Meng; Li, Shanshan; Luo, Zhantao; Li, Yongfei; Pan, Langsheng; Liu, Yuejin

doi:10.1002/cctc.201601246

Cited by 7 publications

(5 citation statements)

References 56 publications

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“…The specific surface areas of ZrO 2 −CeO 2 and 15 %/ZrO 2 −CeO 2 obtained by BET are 105 m 2 /g and 42 m 2 /g, respectively. It suggested that the ZrO 2 −CeO 2 support could be corroded by KF precursor and the KF precursor could be highly dispersed on the support, which was in accordance with the results obtained from the XRD . The pore size also changes accordingly, the pore sizes of ZrO 2 −CeO 2 and 15 %/ZrO 2 −CeO 2 mainly locate at 7.9 nm and 14.4 nm, respectively.…”

Section: Resultssupporting

confidence: 85%

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

Tang

Liu

et al. 2018

ChemCatChem

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A novel KF‐modified nanorod support Zr−Ce oxide as an efficient solid base catalyst was prepared. XRD, FT‐IR, CO2‐TPD, TEM‐EDS, and Raman were employed for the catalyst characterization. The results showed that the appropriate activation temperature could facilitate the insertion of K+ into the vacancy sites of the ZrO2−CeO2 nanorod support, and some new strong basic active sites of K3Zr2F11, KCe2F9, Ce2Zr2O7 were generated with the addition of KF on the mixed ZrO2−CeO2 support. The prepared KF/ZrO2−CeO2 as a solid base catalyst exhibited high activity and stability for transesterification of soybean oil with methanol to biodiesel. The high biodiesel yield of 99.8 % was obtained under the following conditions: 15 wt % KF loading amount, calcination temperature 400 °C, molar ratio of methanol/oil 20 : 1, 5 wt % catalyst account (wt/wt oil), reaction time 5 h at 65 °C. The formation of basic active sites of the KF/ZrO2−CeO2 catalyst and the mechanism for the catalytic reaction were explored.

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Section: Resultssupporting

confidence: 85%

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

Tang

Liu

et al. 2018

ChemCatChem

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“…The pore collapse and sealing in our nanocomposites can be tentatively explained by the corrosiveness of alkali salts to various metal oxides, which has been known for decades. , In fact, molten salts have been even used to produce mesoporous structures starting from nonporous metal oxides, and, in particular, from silica. ,− To better understand the role of molten salts on our final composites, we performed a series of control experiments in which we systematically varied the molten salts composition and investigated the structural and optical properties of the corresponding products. When the synthesis was performed with KBr and KNO 3 , the product, consisting of m-SiO 2 particles whose pores are filled with LHP NCs and KNO 3 (Figure a,c), exhibited a high PLQY (89 ± 10%) and a low resistance against water and aqua regia (Figure a,b) .…”

mentioning

confidence: 99%

Low-Temperature Molten Salts Synthesis: CsPbBr₃ Nanocrystals with High Photoluminescence Emission Buried in Mesoporous SiO₂

Park

Brescia

et al. 2021

ACS Energy Lett.

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Using mesoporous SiO 2 to encapsulate CsPbBr 3 nanocrystals is one of the best strategies to exploit such materials in devices. However, the CsPbBr 3 /SiO 2 composites produced so far do not exhibit strong photoluminescence emission and, simultaneously, high stability against heat and water. We demonstrate a molten-salts-based approach delivering CsPbBr 3 /mesoporous-SiO 2 composites with high PLQY (89 ± 10%) and high stability against heat, water, and aqua regia. The molten salts enable the formation of perovskite nanocrystals and other inorganic salts (KNO 3 –NaNO 3 –KBr) inside silica and the sealing of SiO 2 pores at temperatures as low as 350 °C, representing an important technological advancement (analogous sealing was observed only above 700 °C in previous reports). Our CsPbBr 3 /mesoporous-SiO 2 composites are attractive for different applications: as a proof-of-concept, we prepared a white-light emitting diode exhibiting a correlated color temperature of 7692K. Our composites are also stable after immersion in saline water at high temperatures (a typical underground environment of oil wells), therefore holding promise as oil tracers.

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“…9: 211479 basicity, it has the disadvantages of high calcination temperature, small specific surface area and low selectivity. To obtain a solid base catalyst with a large specific surface area [55,56], Liu et al [57] used La 2 O 3 as a protection medium for SBA-15 support. The combination of KF and La 2 O 3 facilitated the generation of super basic sites to obtain a solid base catalyst with an average pore diameter of approximately 5 nm.…”

Section: Introductionmentioning

confidence: 99%

Macrolactonization of methyl 15-hydroxypentadecanoate to cyclopentadecanolide using KF-La/γ-Al ₂ O ₃ catalyst

Cheng

Wang

et al. 2022

R. Soc. open sci.

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It has been a challenge to synthesize macrolide musk in excellent yields with high purity. KF-La/γ-Al 2 O 3 catalyst was prepared from a highly basic mesoporous framework using a mild method. The prepared KF-La/γ-Al 2 O 3 catalyst was employed for the synthesis of cyclopentadecanolide from methyl 15-hydroxypentadecanoate. The morphology and structure of prepared catalysts were characterized using XRD, TG-DTG, SEM, EDX, TEM, BET and CO 2 -TPD. The results revealed that the K 3 AlF 6 and LaOF are produced on the surface of KF-La/γ-Al 2 O 3 , and LaO can promote the dispersion of KF on the surface of Al 2 O 3 . Catalysts pore size main distribution ranges between 10 and 30 nm, the maximum CO 2 desorption temperature is 715°C when the La loading is 25%. Because F − ion has a higher electronegativity than O 2− ion, the KF-promoted metal oxide (Al 2 O 3 or/and La 2 O 3 ) contained more strong basic sites, compared with that of the corresponding metal oxide. The yield of cyclopentadecanolide obtained at 0.5 g KF-25La/γ-Al 2 O 3 catalyst and a reaction temperature of 190°C for 7 h were 58.50%, and the content after reactive distillation is 98.8%. The KF-La/γ-Al 2 O 3 catalyst has a larger pore size and basic strength, which is more conducive to the macrolactonization of long-chain hydroxy ester.

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Low‐Temperature Preparation of a Mesoporous Silica Superbase by Employing the Multifunctionality of a La₂O₃ Interlayer

Cited by 7 publications

References 56 publications

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

Low-Temperature Molten Salts Synthesis: CsPbBr₃ Nanocrystals with High Photoluminescence Emission Buried in Mesoporous SiO₂

Macrolactonization of methyl 15-hydroxypentadecanoate to cyclopentadecanolide using KF-La/γ-Al ₂ O ₃ catalyst

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Low‐Temperature Preparation of a Mesoporous Silica Superbase by Employing the Multifunctionality of a La2O3 Interlayer

Cited by 7 publications

References 56 publications

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

A Highly‐Efficient KF‐Modified Nanorod Support Zr−Ce Oxide Catalyst and its Application

Low-Temperature Molten Salts Synthesis: CsPbBr3 Nanocrystals with High Photoluminescence Emission Buried in Mesoporous SiO2

Macrolactonization of methyl 15-hydroxypentadecanoate to cyclopentadecanolide using KF-La/γ-Al 2 O 3 catalyst

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Low‐Temperature Preparation of a Mesoporous Silica Superbase by Employing the Multifunctionality of a La₂O₃ Interlayer

Low-Temperature Molten Salts Synthesis: CsPbBr₃ Nanocrystals with High Photoluminescence Emission Buried in Mesoporous SiO₂

Macrolactonization of methyl 15-hydroxypentadecanoate to cyclopentadecanolide using KF-La/γ-Al ₂ O ₃ catalyst