K-F zeolite nanocrystals synthesized from organic-template-free precursor mixture

Wong, Siew Fang; Awala, Hussein; Vincente, Aurélie; Retoux, R.; Ling, Tau Chuan; Mintova, Svetlana; Mukti, Rino R.; Ng, Eng-Poh

doi:10.1016/j.micromeso.2017.04.053

Cited by 37 publications

(17 citation statements)

References 42 publications

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“…Nevertheless, the amorphous hump became weaker and shifted to 2θ = 27.8 • (Figure 1b: W-2). Both XRD and AAS elemental analyses thus revealed the occurrence of amorphous phase reorganization into secondary more reactive amorphous solid at 10 h [26]. This amorphous-amorphous phase transformation was also confirmed by FESEM study where bulkier amorphous entities (ca.…”

Section: Effect Of Heating Timesupporting

confidence: 53%

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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Section: Effect Of Heating Timesupporting

confidence: 53%

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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“…5b) [17]. On the other hand, another IR band at 1053 cm -1 assigned to the Si-O-T symmetric stretching vibration mode appeared [46]. The intensity of these bands increased in the samples subjected to longer crystallization and also a peak shifting was observed indicating the change of the chemical composition of the sample, i.e., increased of Al content (Fig.…”

Section: Kinetics Of Formation Of Cs-abw Nanocrystalsmentioning

confidence: 89%

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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“…15 The IR bands at 986 and 1130 cm −1 were assigned to the internal vibrations of Si-O-T (T = Si, Al) asymmetric stretching modes, while the signal at 1062 cm −1 was attributed to the Si-O-T symmetric stretching vibration mode. 16 Several weak signals observed at 541, 608, and 671 cm −1 were characteristic of the double zigzag chain present in the ABW framework structure. 17 The small peak that resonated at 882 cm −1 was due to the presence of the TO-H group and a weak band at 449 cm −1 corresponded to the bending vibration of TO 4 .…”

Section: Synthesis Of Cs-abw Zeolite Nanocrystalsmentioning

confidence: 98%

Organotemplate-free Cs-ABW nanozeolite as highly reactive and recyclablecatalyst for Henry reaction between benzaldehyde and nitroethane

Ghrear¹,

Wong²,

Tan³

et al. 2019

Turk J Chem

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Zeolite Cs-ABW nanocatalyst has been hydrothermally synthesized without using any harmful organic template. The zeolite nanocrystal with very high solid yield (81.88%) can be obtained within 60 min and at 180°C (~20 atm), conditions that are much faster and gentler than the existing synthesis methods. The orthorhombic Cs-ABW nanocrystals (mean size of 32 nm) have high aluminum content (Si/Al ratio = 1.14) and possess high basicity.The nanocrystals also exhibit better catalytic activity than conventional homogeneous catalysts in the Henry (nitroaldol) reaction of benzaldehyde with nitroethane under microwave heating conditions. The nanocatalyst does not suffer from coking and leaching problems. It can be reused without loss of reactivity even after five consecutive runs under the described reaction conditions.

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K-F zeolite nanocrystals synthesized from organic-template-free precursor mixture

Cited by 37 publications

References 42 publications

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

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

Synthesis of Cs-ABW nanozeolite in organotemplate-free system

Organotemplate-free Cs-ABW nanozeolite as highly reactive and recyclablecatalyst for Henry reaction between benzaldehyde and nitroethane

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