Hydrothermal syntheses and structural characterization of zeolite analogue compounds based on cobalt phosphate

Feng, Pingyun; Bu, Xianhui; Stucky, Galen D.

doi:10.1038/41937

Cited by 559 publications

(329 citation statements)

References 24 publications

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“…Unfortunately, the amount of framework Co 2+ is still relatively low for most CoAPO molecular sieves, although Stucky and co-workers have shown that the [Co]: [Al] ratio in the framework of some materials with small pore openings exceeds the value of 1.0 [27,28]. From both a scientific as well as a more applied catalytic point of view, it is important to push the framework Co 2+ content to the highest possible substitution levels.…”

Section: Introductionmentioning

confidence: 99%

Solvent effects in the synthesis of CoAPO-5, -11 and -34 molecular sieves

Fan

Dou

et al. 2005

Microporous and Mesoporous Materials

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Series of CoAPO-5, CoAPO-11 and CoAPO-34 molecular sieves have been synthesized starting from a synthesis gel varying in its amount of Co 2+ and type of solvent molecule. Four protonic solvents have been investigated: water, ethanol, ethylene glycol and glycerol. The obtained crystalline materials were characterized with X-ray diffraction; diffuse reflectance UV-Vis-NIR spectroscopy; infrared spectroscopy; elemental analysis; electron microscopy microprobe analysis and thermo-gravimetrical analysis. It was found that the type of solvent has a strong influence on the crystallization behavior and the substitution degree of Co 2+ for Al 3+ in the framework of microporous aluminophosphates. Ethanol, ethylene glycol and glycerol seem to be the best solvents for the synthesis of single-phase and highly crystalline Co-rich CoAPO-34, CoAPO-11 and CoAPO-5 molecular sieves, respectively. By varying the type of solvent molecule, Co content and template amount in the synthesis gel it was possible to increase the substitution degree of framework Co 2+ in microporous aluminophosphates. In this manner, around 10%, 25% and 36% of Al 3+ could be replaced by Co 2+ in the framework of CoAPO-11, CoAPO-5 and CoAPO-34, respectively. These substitution degrees are substantially higher than those for CoAPO materials synthesized in the presence of water.

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Section: Introductionmentioning

confidence: 99%

Solvent effects in the synthesis of CoAPO-5, -11 and -34 molecular sieves

Fan

Dou

et al. 2005

Microporous and Mesoporous Materials

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“…For example, it is possible to create a Brønsted acid site within an AlPO framework through replacing Al(III) with Co (II), via type I substitution, which leads to the formation of negatively charged framework. During the synthesis, the net negative charge will be quenched by a combination of structure directing agent (protonated amines) and water located within the framework [21]. Upon calcination, protons attached to the Co-O-P bridges will balance the negative charge associated with the framework, and this will result in the creation of Brønsted acid centres.…”

Section: Introduction and Design Strategymentioning

confidence: 99%

Influence of dopant substitution mechanism on catalytic properties within hierarchical architectures

et al. 2016

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A range of hierarchically porous (HP) AlPO-5 catalysts, with isomorphously substituted transition metal ions, have been synthesized using an organosilane as a soft template. By employing a range of structural and spectroscopic characterization protocols, the properties of the dopant-substituted species within the HP architectures have been carefully evaluated. The resulting nature of the active site is shown to have a direct impact on the ensuing catalytic properties in the liquid-phase Beckmann rearrangement of cyclic ketones.

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“…Here we are particularly interested in the separation of organic anions. Among reported MOFs, there are comparatively few permanently porous MOFs with positive framework (P-MOFs) 6,36,37 , whose rarity is also mirrored in other types of porous materials, including zeolites [38][39][40][41][42][43][44][45] . In addition, known P-MOFs often have low stability or small pore size that only permits the exchange of small inorganic anions 7,10 .…”

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confidence: 99%

Selective anion exchange with nanogated isoreticular positive metal-organic frameworks

et al. 2013

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Crystalline porous materials, especially inorganic porous solids such as zeolites, usually have negative frameworks with extra-framework mobile cations and are widely used for cation exchange. It is highly desirable to develop new materials with positive frameworks for selective anion exchange and separation or storage and delivery. Recent advances in metalorganic framework synthesis have created new opportunities in this direction. Here we report the synthesis of a series of positive indium metal-organic frameworks and their utilization as a platform for the anion exchange-based separation process. This process is capable of size-or charge-selective ion-exchange of organic dyes and may form the basis for size-selective ion chromatography. Ion-exchange dynamics of a series of organic dyes and their selective encapsulation and release are also studied, highlighting the advantages of metal-organic framework compositions for designing host materials tailored for applications in anion separation and purification.

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Hydrothermal syntheses and structural characterization of zeolite analogue compounds based on cobalt phosphate

Cited by 559 publications

References 24 publications

Solvent effects in the synthesis of CoAPO-5, -11 and -34 molecular sieves

Solvent effects in the synthesis of CoAPO-5, -11 and -34 molecular sieves

Influence of dopant substitution mechanism on catalytic properties within hierarchical architectures

Selective anion exchange with nanogated isoreticular positive metal-organic frameworks

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