Synthesis and catalytic performance of a small crystal NaY zeolite with high SiO2/Al2O3 ratio

Mu, Liang; Feng, Wei; Zhang, Haobin; Hu, Xiubin; Cui, Qingyan

doi:10.1039/c9ra03324f

Cited by 22 publications

(13 citation statements)

References 44 publications

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“…Structure sensitive vibrations of the Y zeolite appeared near 580 (double six-ring, D6R), 720 ([T(Si or Al)O 4 ] symmetric stretching vibration in the inner framework) and 790 cm −1 (TO 4 symmetric stretching vibration in the outer framework). 16,35 In the early crystallization stage of the preparation of NaY-CPAM zeolite (Fig. 6a and b, 8 h), in addition to the minimal D6R band, another two bands had not been established.…”

Section: Crystallization Investigation Of Nay-cpam Zeolitementioning

confidence: 99%

“…It is generally agreed that the thermal stability of zeolite decreases with the decrease in the zeolite crystal size. 20,35 However, NaY-CPAM zeolite is an exception. The specific results were as follows.…”

Section: Properties Of Nay-cpam Zeolitementioning

confidence: 99%

“…[46][47][48] The dealkylation of bulk molecular 1,3,5-triisopropylbenzene (TIPB) is often used to evaluate the catalytic properties of catalysts with different crystal sizes. 11,20,35 The results for the catalytic cracking of TIPB for USY-CPAM and USY-Contrast zeolites are listed in Fig. 11b.…”

Section: Catalysis Performancementioning

confidence: 99%

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Strategy for the synthesis of zeolite Y by artificial-fish-reef breeding negative crystals

Liu

Xia

Nie

et al. 2022

Inorg. Chem. Front.

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Section: Crystallization Investigation Of Nay-cpam Zeolitementioning

confidence: 99%

Section: Properties Of Nay-cpam Zeolitementioning

confidence: 99%

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Strategy for the synthesis of zeolite Y by artificial-fish-reef breeding negative crystals

Liu

Xia

Nie

et al. 2022

Inorg. Chem. Front.

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“…Figure 3 shows the cubic surface morphology of the prepared catalysts which is the typical morphology for the faujasite zeolitic materials. The difference in the crystal size between the two catalysts results from the different framework composition (aluminum and aluminum-free for Ga-BaY(IS) and Ga-BaY(Sil), respectively) which leads to different crystal growth rates during the synthesis [19,20].…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Effects of Framework Disruption of Ga and Ba Containing Zeolitic Materials by Thermal Treatment

2020

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The effect of the thermal treatment of some zeolitic materials was studied on oxidative dehydrogenation (ODH) of n-octane. Gallium containing faujasite catalysts were synthesized using isomorphic substitution, specifically, a galosilicalite (Ga-BaY(Sil)) and an aluminosilicalite substituted with gallium (Ga-BaY(IS)), with constant Si/M ratio. The catalysts were thermally treated at different temperatures (250, 550, and 750 °C) before catalytic testing. The quantification of total and strength of acid sites by FT-IR (O-H region), pyridine-IR, and NH3-temperature-programmed desorption (TPD) confirmed a decrease in the number of Brønsted acid sites and an increase in the number of Lewis acid sites upon increasing the calcination temperature. Isothermal n-octane conversion also decreased with the catalysts’ calcination temperature, whereas octene selectivity showed the opposite trend (also at iso-conversion). The COx selectivity showed a decrease over the catalysts calcined from 250 to 550 °C and then an increase over the 750 °C calcined catalysts, which was due to the strong adsorption of products to strong Lewis acid sites on the catalysts leading to the deep oxidation of the products. Only olefinic-cracked products were observed over the 750 °C calcined catalysts. This suggested that the thermal treatment increases Lewis acid sites, which activate n-octane using a bimolecular mechanism, instead of a monomolecular mechanism.

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“…NaY zeolite has been widely used as catalyst support because of its high surface area and thermal stability [14] . Generally, the commercial zeolite with the surfactant and organic template presentation, which would not only cause environment pollution but also have an impact on the reaction [15] . In this work, we used hydrothermal synthesis method without organic template to prepare NaY zeolites then the Rh/NaY catalysts were obtained by the ion‐exchange technique.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaY Zeolite at Different Calcination Temperatures on the Activity in Hydroformylation of Formaldehyde

et al. 2022

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The NaY zeolites were prepared by hydrothermal synthesis method. The influence of NaY zeolite calcined at different temperatures as carriers for Rh/NaY catalysts on the hydroformylation of formaldehyde was investigated. The physical and chemical properties of Rh/NaY catalysts and their performance were characterized in details. When the zeolites were calcined at 400-700 °C, the crystal structure and morphology were kept unchanged within this range of calcination temperature. However, the surface crystallinity and surface area were reduced with increasing the temperature due to the partially collapsed of its framework, and thus reducing the confine of cages structure to rhodium species promote its participation in the coordination reaction. The reduction in the amount of surface Lewis acid can reduce the electronegativity of the carrier and change the electronic state of the surface rhodium species, which would weaken the hindrance to anionic speciation and promote CO insertion, which facilitates the hydroformylation of formaldehyde.

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Synthesis and catalytic performance of a small crystal NaY zeolite with high SiO₂/Al₂O₃ ratio

Abstract: A small crystal NaY zeolite with a high SiO2/Al2O3 ratio was successfully synthesized with seeding and without organic template, and the effects of the silicon source, aging time and Na2O seeding content on the crystal size of the NaY zeolite were investigated.

Cited by 22 publications

References 44 publications

Strategy for the synthesis of zeolite Y by artificial-fish-reef breeding negative crystals

Strategy for the synthesis of zeolite Y by artificial-fish-reef breeding negative crystals

Effects of Framework Disruption of Ga and Ba Containing Zeolitic Materials by Thermal Treatment

Effect of NaY Zeolite at Different Calcination Temperatures on the Activity in Hydroformylation of Formaldehyde

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