Synthesis Strategies for Ultrastable Zeolite GIS Polymorphs as Sorbents for Selective Separations

Oleksiak, Matthew D.; Ghorbanpour, Arian; Conato, Marlon T.; McGrail, B. Peter; Grabow, Lars C.; Motkuri, Radha Kishan; Rimer, Jeffrey D.

doi:10.1002/chem.201603995

Cited by 9 publications

(26 citation statements)

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“…The zeolite Na-P2 used for this experiment was synthesized by a procedure reported previously. 26 Sodium hydroxide or potassium hydroxide was dissolved in deionized water to which aluminum sulfate hydrate or sodium aluminate was added. The synthesis mixture was stirred until it became clear.…”

Section: Glass Preparationmentioning

confidence: 99%

In-situ monitoring of seeded and unseeded stage III corrosion using Raman spectroscopy

et al. 2019

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Stage III glass dissolution, the occasionally observed tendency for accelerated aqueous corrosion after extensive time spent at low reaction rates, is a major area of technical uncertainty in long-term glass performance modeling for vitreous nuclear waste forms. Stage III dissolution behavior is thought to be caused by the precipitation of zeolite phases that lower the activity of the ratecontrolling orthosilicic acid ion and cause the acceleration of glass dissolution. The uncertainty lies mainly in a poor understanding of the growth kinetics of these key crystalline phases. It is particularly important to understand the impact of temperature and pH conditions on Stage III behavior. Accurate analysis of this phenomenon is complicated by the typically very long (e.g., years), and variable length of the induction period preceding the onset of Stage III behavior. In this study of a high-sodium aluminoborosilicate glass, we demonstrate the ability to initiate the onset of Stage III behavior in a controllable fashion so as to both reduce the time delay of the incubation period, and to also be able to initiate Stage III dissolution in controlled conditions. In this case, we demonstrate that Stage III glass corrosion behavior is possible at 70°C, a lower temperature than previously observed (90°C), even in an unseeded experiment. We confirm, through a comparison study, that seeded and unseeded Stage III corrosion rates are equivalent. This enables wide-scale testing of Stage III corrosion rates for many glass compositions in relatively short times through this technique. We also report further development of the use of in situ Raman spectroscopy monitoring of boron concentration and pH through simple and chemometric analysis methods.

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Section: Glass Preparationmentioning

confidence: 99%

In-situ monitoring of seeded and unseeded stage III corrosion using Raman spectroscopy

et al. 2019

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“…Baerlocher et al and Mccusker et al [9,10] have found the differences and flexibility in unit cell structures of zeolite P. The distortion of the SBU planes generates two isotypes, P1 and P2, which have different pore sizes and shapes. Likewise, Oleksiak et al [11] have reported that the eight-membered pore of P2 is narrower than that of P1. Consequently, the P2 type has a higher adsorption equilibrium constant for small gases such as H 2 [11].…”

Section: Introductionmentioning

confidence: 92%

“…Likewise, Oleksiak et al [11] have reported that the eight-membered pore of P2 is narrower than that of P1. Consequently, the P2 type has a higher adsorption equilibrium constant for small gases such as H 2 [11].…”

Section: Introductionmentioning

confidence: 92%

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Synthesis of Pure Phase NaP2 Zeolite from the Gel of NaY by Conventional and Microwave-Assisted Hydrothermal Methods

et al. 2020

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The gel of zeolite NaY has potential as a precursor of other zeolites. The particular interest in this work is to convert the gel of NaY to NaP2. We found that the pure phase NaP2 can be produced simply by the conventional hydrothermal (CH) method at 150 °C for 24 h. This NaP2 sample, named CH150, has an average particle size of 10.3 µm and an Si/Al ratio of 1.82. In the case of single crystallization via microwave-assisted hydrothermal (MH) method, various parameters were studied, including the crystallization temperature (90, 150, 175 °C) and time (15, 30, 45, 60 min). The samples were analyzed by X-ray diffraction and scanning electron microscopy. However, mixed phases of P1 and P2 or ANA were obtained from all samples. Another attempt was made by a double crystallization via MH method as followed: at 90 °C for 1 h, quickly cooled down to room temperature in the microwave chamber and aged for 23 h, and finally at 150 °C for 1 h. The sample, named MH90A150, has an average crystal size of 16.45 µm and an Si/Al ratio of 1.85. The high Al content of NaP2 in both samples (CH150 and MH90A150) could lead to interesting applications.

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“…However, there are a limited number of zeolites that can be synthesized by OSDA-free routes (Oleksiak and Rimer, 2014). The OSDA-free crystallization of zeolites is not easy to control (Navrotsky et al, 2009;Maldonado et al, 2013;Oleksiak et al, 2016). Although, all zeolites have the same formula and geometric structure, but the SiAl ratio, Na content and hydration is difficult to determine.…”

Section: Introductionmentioning

confidence: 99%

Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions

Hameed¹,

Abdel-Aal²,

Farghaly³

et al. 2020

Physicochem. Probl. Miner. Process.

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Aluminum and fumed silica as solid industrial wastes were converted to zeolite NaP as a value-added product without any template. The hydrothermal process was optimized using static autoclave. The crystallization was carried out at 100, 120 and 150°C for 24, 48 and 72 h. The prepared zeolite of Si:Al ratio of 1.2 was characterized using X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) provided with Energy Dispersive Spectroscopy (EDS), Surface Area, Fourier Transmitted Infra-Red (FTIR) and Thermal Analysis (TG-DSC). The crystalline phase was formed at 100°C after 72 hours and at 120°C after 48 hours, while it was formed after 24 h only at 150°C. Increasing temperature and time lead to the conversion of the prismatic gibbsite crystals into plate-like structure of zeolite which is then formed cauliflower-like structure. The prepared zeolite was employed as adsorbent for Ni 2+ and Cu 2+ ions from aqueous solution. The kinetic studies of adsorption processes were performed.

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Synthesis Strategies for Ultrastable Zeolite GIS Polymorphs as Sorbents for Selective Separations

Cited by 9 publications

References 0 publications

In-situ monitoring of seeded and unseeded stage III corrosion using Raman spectroscopy

In-situ monitoring of seeded and unseeded stage III corrosion using Raman spectroscopy

Synthesis of Pure Phase NaP2 Zeolite from the Gel of NaY by Conventional and Microwave-Assisted Hydrothermal Methods

Exploitation of industrial solid wastes for preparing zeolite as a value-added product and its kinetics as adsorbent for heavy metal ions

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