Rapid synthesis of nanocrystalline zeolite W with hierarchical mesoporosity as an efficient solid basic catalyst for nitroaldol Henry reaction of vanillin with nitroethane

Cheong, Ying-Wai; Wong, Ka-Lun; Ling, Tau Chuan; Ng, Eng-Poh

doi:10.1166/mex.2018.1454

Cited by 16 publications

(11 citation statements)

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“…In addition, other more eco-friendly and cheaper approaches such as seed-induced [11,12], ionothermal [13], post-milling recrystallization [14,15], confined space synthesis [16] and organotemplate-free [17,18] methods were used to prepare nanosized zeolite and zeotype materials. So far, a number of zeolite nanocrystals (*BEA [19], EDI [5], EMT [20], FAU [21,22], GIS [23], LTA [24], LTJ [17], LTL [25], MEL [26], MER [27], MFI [28], MOR [29], SOD [30]) and zeotype (AEI [31], AFI [32], AFO [33], CHA [34]) has been successfully synthesized.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Ghrear¹,

Rigolet²,

Daou³

et al. 2019

Microporous and Mesoporous Materials

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Cesium-aluminosilicate zeolite nanocrystals with ABW framework structure are synthesized free of organic template using hydrothermal approach. The crystallization process of Cs-ABW zeolite nanocrystals by varying the initial gel molar composition, heating temperature and crystallization time was studied. More detailed investigations of the formation of Cs-ABW nanozeolite using a reactive clear precursor hydrogel (4SiO2:1Al2O3:16Cs2O:160H2O) were then carried out. Fully crystalline Cs-ABW nanozeolites were obtained within 120 min at 180 C and 22 bar, which is considerably faster in comparison to the currently available method involving treatment at 695 C, 1000 bar and 46 h. The Cs-ABW nanocrystals have grain shape morphology with a mean size of 32 nm and they do not agglomerate for long durations. The nanosized Cs-ABW zeolite has high alumina content (Si/Al ratio = 1.04). These nanocrystals can be prepared in high solid yield (ca. 82%) thus offering a promising route for large-scale production of highly basic zeolite nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Ghrear¹,

Rigolet²,

Daou³

et al. 2019

Microporous and Mesoporous Materials

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“…The XRD peaks of the samples (e.g., [321], [400], [332], and [440] peaks) also broadened when TPOAC was added. Such a phenomenon can be explained by the reduced crystallite size [33]. The crystallite size of Cs-pollucite samples was calculated using the Scherrer equation.…”

Section: Synthesis and Characterization Of Hierarchical Cs-pollucite mentioning

confidence: 99%

Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone

et al. 2020

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Cs–pollucite can be a potential solid base catalyst due to the presence of (Si-O-Al)−Cs+ basic sites. However, it severely suffers from molecular diffusion and pore accessibility problems due to its small micropore opening. Herein, we report the use of new organosilane, viz. dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride (TPOAC), as a promising pore-expanding agent to develop the hierarchical structure in nanosized Cs–pollucite. In respect to this, four different amounts of TPOAC were added during the synthesis of hierarchical Cs–pollucite (CP-x, x = 0, 0.3, 1.0, or 2.0, where x is the molar ratio of TPOAC) in order to investigate the effects of TPOAC in the crystallization process of Cs–pollucite. The results show that an addition of TPOAC altered the physico-chemical and morphological properties of hierarchical Cs–pollucite, such as the crystallinity, crystallite size, pore size distribution, surface areas, pore volume, and surface basicity. The prepared solids were also tested in Claisen–Schmidt condensation of benzaldehyde and acetophenone, where 82.2% of the conversion and 100% selectivity to chalcone were achieved by the CP-2.0 catalyst using non-microwave instant heating (200 °C, 100 min). The hierarchical CP-2.0 nanocatalyst also showed better catalytic performance than other homogenous and heterogeneous catalysts and displayed a high catalyst reusability with no significant deterioration in the catalytic performance even after five consecutive reaction runs.

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“…In particular, potassium containing MER zeolite (K-MER), a zeolite which has framework topology similar to the mineral merlinoite; has drawn researchers' attention due to its three-dimensional pore channel system with medium pore sizes and high hydrophilicity. Thus, it is a promising material for adsorption [9], separation [10], and catalytic applications [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Synthesis Parameters on Crystallization Behavior of K-MER Zeolite and Its Morphological Properties on Catalytic Cyanoethylation Reaction

et al. 2020

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MER-type zeolite is an interesting microporous material that has been widely used in catalysis and separation. By carefully controlling the synthesis parameters, a procedure to synthesize K-MER zeolite crystals with various morphologies has been developed. The silica, water and mineralizer content in the synthesis gel, as well as crystallization time and temperature, have a profound impact on the crystallization kinetics, resulting in zeolite solids with various degrees of crystallinity, crystal sizes and shapes. K-MER zeolite crystals with nanorod, bullet-like, prismatic and wheatsheaf-like morphologies have been successfully obtained. The catalytic performances of the K-MER zeolites in cyanoethylation of methanol, under novel non-microwave instant heating, have been investigated. The zeolite in nanosize form shows the best catalytic performance (94.1% conversion, 100% selectivity) while the bullet-like zeolite gives poorest catalytic performance (44.2% conversion, 100% selectivity).

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Rapid synthesis of nanocrystalline zeolite W with hierarchical mesoporosity as an efficient solid basic catalyst for nitroaldol Henry reaction of vanillin with nitroethane

Cited by 16 publications

References 0 publications

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Hierarchical Cs–Pollucite Nanozeolite Modified with Novel Organosilane as an Excellent Solid Base Catalyst for Claisen–Schmidt Condensation of Benzaldehyde and Acetophenone

Effects of Synthesis Parameters on Crystallization Behavior of K-MER Zeolite and Its Morphological Properties on Catalytic Cyanoethylation Reaction

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