Thermal transformations in systems based on zeolites Y, X, and A containing zinc and sodium nitrates

Usachev, N. Ya.; Belanova, E. P.; Krukovsky, Ivan M.; Kanaev, S. A.; Chemistry, Russian Academy of Sciences O. A. LukyanovN.D. Zelinsky Institute of Organic; Kazakov, A. V.

doi:10.1023/b:rucb.0000009636.89718.56

Cited by 14 publications

(5 citation statements)

References 9 publications

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“…The measurement was carried out in N 2 atmosphere with a heating rate of 10 °C min −1 . In the thermogram, one slight weight loss was observed beyond 120 °C, which might correspond to the evaporation of the residual solvent present in the zeolite matrix, and the weight loss above 200 °C might to be related to loss of water molecules from hydration complexes formed due to exchangeable cations . The slight mass loss above 350 °C may be associated with dehydroxylation.…”

Section: Resultsmentioning

confidence: 95%

“…The dehydroxylation process occurs by breaking of hydroxyl bonds formed during cation exchange which polarizes water molecules, which induces the discharge of excess water from zeolite cavities. The nature and size of the exchangeable cation and number of Al ions present in zeolitic structure directly affect the zeolite water content . The ratio of Si to Al plays an important role in influencing the thermal stability of zeolites .…”

Section: Resultsmentioning

confidence: 99%

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Polyaniline–13X zeolite composite‐supported platinum electrocatalysts for direct methanol fuel cell applications

Vinodh

Rana

Gopi

et al. 2019

Polymer International

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We successfully synthesized 13X zeolite using a hydrothermal method. Then, composites of polyaniline (PANI) with 13X zeolite and PANI–13X with platinum were prepared by chemical oxidative polymerization and chemical reduction, respectively. Field emission scanning electron microscopy, X‐ray diffraction, Raman spectroscopy and Brunauer–Emmett–Teller techniques were used to characterize the PANI–Pt and PANI–Pt–13X composites. Further, the electrocatalytic activity towards methanol oxidation of the synthesized catalysts was explored using cyclic voltammetry in 1 mol L−1 CH3OH + 0.5 mol L−1 H2SO4 solution. From the obtained results, PANI–Pt–13X shows superior performance compared to PANI–Pt towards methanol oxidation and electrical conductivity. Hence, the 13X zeolite‐incorporated PANI–Pt composite could be an efficient catalyst for direct methanol fuel cell applications. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Polyaniline–13X zeolite composite‐supported platinum electrocatalysts for direct methanol fuel cell applications

Vinodh

Rana

Gopi

et al. 2019

Polymer International

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“…20,21 The weight loss occurring above 200 C can be associated with structural water due to hydration complexes formed with exchangeable cations. 22 The water loss above 400 C can be associated with dihydroxylation, formed when exchangeable cations polarize water molecules, leading to release of more water from the zeolite cavities. Removal of a portion of the tetrahedrally coordinated aluminum from the zeolite framework has been shown to increase its thermal stability, which is oen directly proportional to Si : Al ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Removal of a portion of the tetrahedrally coordinated aluminum from the zeolite framework has been shown to increase its thermal stability, which is often directly proportional to Si : Al ratio. 22 The reason for this increase in stability might be attributable to the formation of new Si–O–Si bonds. The four hydroxyls in the product of reaction are each bonded to silicon; on heating, these four groups would be expected to condense to yield water and Si–O–Si bonds.…”

Section: Resultsmentioning

confidence: 99%

Graphene-oxide loading on natural zeolite particles for enhancement of adsorption properties

Silva

Lecus

Gajdardziska‐Josifovska

et al. 2020

RSC Adv.

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“…Zeolites could often be hydrated at non-elevated temperatures, and water molecules and other volatiles could often be found on the surface and in the cavities. The adsorbed water content reflects the free volume in the zeolite cavities which could be accessible to adsorbates (Usachev et al 2003;Majchrzak-Kuceba 2013). Therefore, the quantification of desorbed volatiles from an adsorbent of zeolitic nature could be used as a measure of porosity, especially when a comparison is involved.…”

Section: Moisture and Ash Contentmentioning

confidence: 99%

Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

Oluyinka

Patel²,

Shah

et al. 2020

Appl Water Sci

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Abstractp-Nitroaniline (PNAN) and nitrobenzene (NB) being important raw materials and intermediates for the production of a wide range of chemical products have the potential of constituting water pollutants. Hence, the development of the means of removing these chemicals from water would go a long way to safeguard the health of the environment. The goal of this research was to transform bagasse fly ash (BFA), solid waste from the sugar industry into porous zeolitic adsorbents MgFZBFA and MgMZBFA and examine them for their adsorptive removal of PNAN and NB from aqueous solutions. The syntheses of the sorbents involve alkali fusion technique and microwave hydrothermal treatment for the desired properties. Advanced characterization techniques such as FTIR (Fourier transform infrared spectroscopy), XRF (X-ray fluorescence spectroscopy), XRD (X-ray diffraction spectroscopy), SEM (scanning electron microscopy), Brunauer–Emmett–Teller (BET)/Barrett–Joyner–Halenda (BJH) Method, and TGA (thermogravimetric analysis) were used for the characterization and evaluation of the sorbents’ properties. The adsorptive removal of PNAN and NB from aqueous solutions by MgFZBFA and MgMZBFA were investigated. Various parameters such as pH, adsorbent dosage, initial sorbate concentration were optimized during the adsorption experiment to achieve best performance. Adsorption isotherm, kinetics and dynamics were studied. It was found that Langmuir adsorption isotherm model better represents the adsorption processes and that the processes follow pseudo-second-order kinetics. More so, the sorption processes were most possibly completed by both surface sorption (liquid-film diffusion) and intra-particle diffusion. The maximum sorption capacities observed with MgFZBFA for PNAN and NB are 30.86 mg g−1 and 19.92 mg g−1, while with MgMZBFA the values are 12.72 mg g−1 and 10.20 mg g−1, respectively. The performances of MgFZBFA and MgMZBFA for the sorption of PNAN and NB were compared with some adsorbents previously studied for the same purpose, and results show that the adsorbents in the present study exhibit better performances. The application as materials of cheap source for the removal of PNAN and NB from contaminated water could be considered.

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Thermal transformations in systems based on zeolites Y, X, and A containing zinc and sodium nitrates

Cited by 14 publications

References 9 publications

Polyaniline–13X zeolite composite‐supported platinum electrocatalysts for direct methanol fuel cell applications

Polyaniline–13X zeolite composite‐supported platinum electrocatalysts for direct methanol fuel cell applications

Graphene-oxide loading on natural zeolite particles for enhancement of adsorption properties

Microwave and fusion techniques for the synthesis of mesoporous zeolitic composite adsorbents from bagasse fly ash: sorption of p-nitroaniline and nitrobenzene

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