Ion-exchange properties of zeolites. IV. Alkaline earth ion exchange in the synthetic zeolites Linde X and Y

Sherry, Howard S.

doi:10.1021/j100858a024

Cited by 101 publications

(27 citation statements)

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“…By studying bulk samples at different Sr loading levels, they discovered a miscibility gap and explained the unusual behavior of the isotherm observed by Sherry (1968). Using in situ synchrotron X-ray powder-diffraction, we have followed this system in LSX to discern the details of the exchange mechanism.…”

Section: Results Of the Synchrotron (Nsls) In Situ Powderdiffraction mentioning

confidence: 99%

Dynamic Powder Crystallography With Synchrotron X-Ray Sources

Parise

Cahill

Lee

2000

The Canadian Mineralogist

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The increased brightness, tunability, low divergence and low emittance of X-ray beams available at synchrotron X-ray sources facilitate a variety of powder-diffraction experiments not practical using conventional in-house sources. Furthermore, the increased availability of fast position-sensitive detectors, along with implementation of improved software, make possible new classes of experiments. These include time-resolved powder-diffraction of phase transitions, precipitation, recrystallization and ion-exchange reactions. Examples of time-resolved studies that highlight some of these developments include: (1) observations of the phases forming during reaction under controlled hydrothermal conditions (e.g., FeS); (2) full Rietveld structure refinement using time-resolved data to determine the mechanism of ion exchange in zeolites. The advent of area detectors, commonly coupled with focusing optics at synchrotrons, will further increase the time resolution at the synchrotron, possibly leading to a data glut. Solutions are available now, and developments in the near term will allow semi-automatic decisions on which datasets to analyze amongst the thousands collected.Keywords: synchrotron radiation, crystallography, time-resolved studies, diffraction, scattering, high pressure, element partitioning, phase diagrams, ion-exchange reactions, energy-dispersive diffraction. SOMMAIRELa luminance accrue, la possibilité de syntoniser, la faible divergence et le faible pouvoir émissif des faisceaux de rayons X disponibles aux sources synchrotron permettent une série d'expériences en diffraction X sur poudres qui ne sont pas du tout pratiques avec les sources conventionnelles. De plus, la disponibilité accrue de détecteurs efficaces sensibles à la position et de logiciels améliorés rend possible de nouvelles sortes d'expériences. Par exemple, il est maintenant possible d'étudier par diffraction X sur poudres le progrès dans le temps d'une transition de phases, une précipitation, une recristallisation, et une réaction d'échange ionique. Nous décrivons les exemples suivants pour souligner certains de ces développements: (1) observations des phases apparaissant au cours d'une réaction hydrothermale sous conditions controlées, impliquant par exemple FeS; (2) affinement complet d'une structure par la méthode de Rietveld en utilisant des données échelonnées dans le temps pour étudier le mécanisme d'échange ionique dans les zéolites. L'installation de détecteurs à aire, couplée en général avec une focalisation optique dans le circuit d'un synchrotron, augmenteront surement la résolution temporelle dans de telles expériences, menant nécessairement à un surplus de données. Nous avons déjà des solutions à ce problème, et des développements dans un futur rapproché permettront des décisions semi-automatiques à propos de quels prélèvements de données sont à retenir pour analyse, parmi les milliers qui sont enregistrés.(Traduit par la Rédaction)Mots-clés: rayonnement synchrotron, cristallographie, résolution temporelle, diffractio...

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Section: Results Of the Synchrotron (Nsls) In Situ Powderdiffraction mentioning

confidence: 99%

Dynamic Powder Crystallography With Synchrotron X-Ray Sources

Parise

Cahill

Lee

2000

The Canadian Mineralogist

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“…The exchangeable cations in zeolite X are located in two independent but interconnected three-dimensional networks of cavities (2,3). One network consists of supercages with a free diameter of about 13Å.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of N2, Water, C6 Hydrocarbons, and Bulkier Benzene Derivative (TMB) on Na–X Zeolite and Its K+-, Rb+-, and Cs+-Exchanged Analogues

Joshi

Tamhankar

et al. 2001

Journal of Colloid and Interface Science

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“…It was found that the percentage of nitrate sorption increases when the temperature is increased to 40°C; however, when the temperature is increased further, the sorption decreases probably due to the change in energy of sorption or .4) where, R and T is the universal gas constant and absolute temperature, respectively. The free energy of the ion exchange reaction has usually a negative value (Sherry 1968;Tagamil et. al.…”

Section: Sorption Studies Of Nh 4 Nomentioning

confidence: 99%

Use of Surface Modified Inorganic Nano Materials as Slow Release Nitrogen Fertilizer

Bhardwaj

Tomar²

2011

Sustainable Agricultural Development

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Laboratory batch experiments were conducted to investigate the sorption of nitrate from aqueous solutions using hydrothermally synthesized and surface modified zeolite nano particles. The ability of surface modification with hexadecyltrimethyl ammonium (HDTMA) and Dioctadecyldimethyl ammonium (ADOD) greatly enhance the sorption and slow release of nitrate. The slow release tendency of the modified materials has also been studied through Thin Layers in Funnels and Soil Column Analytical Test. The synthesized materials were characterized by different instrumental techniques viz. X-ray diffraction, FTIR, SEM, EDS, TEM, and TGA. IntroductionThe demand of food grain is increasing at an alarming rate due to increasing population and decreasing cropping area. In order to meet the increasing global food demand, it is essential to increase the productive capacity of existing agricultural lands minimizing the yield losses due to pest and weeds, and through applying appropriate nutrients at proper times to the crops. This is to be done in an eco-friendly manner to assure that the crop yield per unit area is increased and the environment is conserved and not degraded. In this regards, agrochemicals have become a necessary evil in augmenting agriculture production and the environment. The increasing use of agrochemicals ultimately results in serious health and environmental problems which must be addressed to minimize the harmful effects. When these chemicals are applied to soil, only a small portion is utilized leaving behind the reserves M. Behnassi et al. (eds.), Sustainable Agricultural Development,

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Ion-exchange properties of zeolites. IV. Alkaline earth ion exchange in the synthetic zeolites Linde X and Y

Cited by 101 publications

References 0 publications

Dynamic Powder Crystallography With Synchrotron X-Ray Sources

Dynamic Powder Crystallography With Synchrotron X-Ray Sources

Adsorption Behavior of N2, Water, C6 Hydrocarbons, and Bulkier Benzene Derivative (TMB) on Na–X Zeolite and Its K+-, Rb+-, and Cs+-Exchanged Analogues

Use of Surface Modified Inorganic Nano Materials as Slow Release Nitrogen Fertilizer

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