Synthesis and characterization of gallium-beta zeolite from fluoride-containing media

Hazm, Jamal Eddine; Caullet, Philippe; Paillaud, Jean‐Louis; Soulard, Michel; Delmotte, Luc

doi:10.1016/s1387-1811(00)00334-6

Cited by 25 publications

(7 citation statements)

References 31 publications

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“…The decrease in the surface area may be due to the bulky trivalent gallium species present in the framework and extra-framework sites, which block the channel and reduce the surface area. The Ga-MCM-22 sample shows a micropore volume of 0.095 cm 3 g –1 , suggesting that gallium ions are distributed on the framework and extra-framework sites in the MCM-22 framework, which block the pores due to their large size. − …”

Section: Resultsmentioning

confidence: 99%

Cyclocondensation of Anthranilamide with Aldehydes on Gallium-Containing MCM-22 Zeolite Materials

Sahu

Sakthivel

2021

ACS Omega

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A gallium-containing ) zeolite material was prepared using a simple hydrothermal method. Fourier transform infrared spectroscopy analysis and powder X-ray diffraction provide evidence of the formation of a pure MCM-22 phase framework and an MWW (MCM-tWenty-tWo) structure. Scanning electron microscopy images showed a uniform spherical shape, interpenetrating the platelet structure and a uniform particle size of approximately 6 μm. 71 Ga nuclear magnetic resonance studies confirmed the presence of gallium in both the tetrahedral framework and the octahedral extra-framework environment. From the sorption studies, the presence of strong acidic sites and the microporous nature of the material were evident. The resultant Ga-MCM-22 material showed an excellent isolated yield of 95% in the synthesis of 2,3-dihydroquinazolin-4(1H)-ones by cyclocondensation of anthranilamide with aldehydes in ethanol. The scope of the reaction was further explored by employing various cyclic, aromatic, and aliphatic aldehydes with anthranilamide. The results provide a very good yield (85−95%). A significant advantage of the developed protocol includes high yield, use of a green solvent, and easy removal of the catalyst through filtration within a short reaction time.

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Section: Resultsmentioning

confidence: 99%

Cyclocondensation of Anthranilamide with Aldehydes on Gallium-Containing MCM-22 Zeolite Materials

Sahu

Sakthivel

2021

ACS Omega

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“…In a previous study on the thermal analysis of silica beta zeolite synthesized from fluoride-containing media under argon, three mass losses occurred from 20-170 °C (I), 170-280 °C (II), and 280-700 °C (III) [17]. The first mass loss was attributed to occluded water.…”

Section: Polymorph A-enriched Silica Beta Zeolitementioning

confidence: 94%

Influence of Al3+ on polymorph A enrichment in the crystallization of beta zeolite

Lü

Gao

et al. 2015

Chinese Journal of Catalysis

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“…The introduction of metals into zeolites is a commonly used strategy to enhance their catalytic or adsorptive performance. This has been made by tremendous efforts, among which, isomorphous substitution of framework aluminum or silicon by transition metals via direct hydrothermal syntheses proves to be the most desirable way to create new heteroatomic zeolite materials [4,5]. For example, Corma et al [6] observed that the framework-substituted Ti-b zeolite exhibited an enhanced activity in olefin epoxidation because the oxirane ring opening reaction was effectively hindered.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Catalytic Performance of the Framework-Substituted Manganese β Zeolite

Zhang

Liu

et al. 2010

Catal Lett

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The framework-substituted manganese b zeolite was synthesized by an unseeded hydrothermal method, using manganese nitrate, colloidal silica, sodium aluminate, and tetraethylammonium hydroxide as raw materials. The optimized synthetic conditions were obtained by adjusting the key synthesis parameters, such as SiO 2 /Al 2 O 3 ratio, TEAOH/SiO 2 ratio, pH value, crystallization temperature, and SiO 2 /MnO ratio. The resulting samples were characterized by powder XRD, UV-vis spectroscopy, nitrogen physical adsorption, and ICP, which complementarily demonstrate the incorporation of manganese into the zeolite framework. Tested in hydroisomerization of n-heptane as a carrier for Pt catalyst, the Mn-incorporated sample showed a very high selectivity for isomerized products 94.7% with a high conversion of n-heptane 71.1% at 230°C.

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Synthesis and characterization of gallium-beta zeolite from fluoride-containing media

Cited by 25 publications

References 31 publications

Cyclocondensation of Anthranilamide with Aldehydes on Gallium-Containing MCM-22 Zeolite Materials

Cyclocondensation of Anthranilamide with Aldehydes on Gallium-Containing MCM-22 Zeolite Materials

Influence of Al3+ on polymorph A enrichment in the crystallization of beta zeolite

Synthesis and Catalytic Performance of the Framework-Substituted Manganese β Zeolite

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