Nanocrystalline sodalite grown from superalkaline NaCl bearing gels at low temperature (333 K) and the influence of TEA on crystallization process

Buhl, Josef‐Christian; Schuster, Karsten; Robben, Lars

doi:10.1016/j.micromeso.2011.01.020

Cited by 16 publications

(17 citation statements)

References 26 publications

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“…4 mesocrystal-like aggregations in form of big orthorhombic prisms of the spherical crystals occurs. Under analogous reaction conditions as in the present study but insertion of NaCl instead of Na 2 CO 3 sodalite nanocrystals were observed by Buhl et al [24]. Their dense growth and coalescence on the surface of previously formed big NaCl cubes was found to be responsible for a special particle aggregation Buhl et al [24].…”

Section: Influence Of Teasupporting

confidence: 84%

“…These globular particles themselves consist of numerous nanocrystallites. The forcing mechanisms of this crystal arrangement are known from a related system with NaCl enclathrated sodalite [24]. The influence of TEA in the carbonate containing aluminosilicate gel system effects the deceleration of nucleation of aluminosilicates.…”

Section: Discussionmentioning

confidence: 99%

“…This was done to prevent the dissolution of Na 2 CO 3 during the washing procedure as found for the big NaCl crystals in Buhl et al [24]. The powder pattern of the unwashed sample can be seen from the X-ray diffractogram shown in Fig.…”

Section: Influence Of Teamentioning

confidence: 99%

See 2 more Smart Citations

The intermediate phase between sodalite and cancrinite: Synthesis of nano-crystals in the presence of Na2CO3/TEA and its thermal- and hydrothermal stability

Grader

Buhl

2013

Microporous and Mesoporous Materials

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Section: Influence Of Teasupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

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The intermediate phase between sodalite and cancrinite: Synthesis of nano-crystals in the presence of Na2CO3/TEA and its thermal- and hydrothermal stability

Grader

Buhl

2013

Microporous and Mesoporous Materials

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“…The presence of water molecules in the framework of the synthesized HS is vividly shown with the strong broad band centered at ~3600 cm -1 [18]. This information confirms the synthesis of pure HS particles and is in agreement with literature [19].…”

Section: Resultssupporting

confidence: 85%

Transesterification of Waste Cooking Oil to Biodiesel over Calcined Hydroxy Sodalite (HS) Catalyst: A preliminary investigation

Makgaba¹,

Daramola²

2015

Proceedings of the 2015 International Conference on Sustainable Energy and Environmental Engineering

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Abstract-In this article, preliminary investigation on the use of hydroxy sodalite (HS) as a solid catalyst for the transesterification of waste cooking oil (WCO) to biodiesel is presented. Hydroxy sodalite was synthesized in our laboratory via the conventional hydrothermal synthesis technique and the crystals were used as basic solid catalyst to convert waste cooking oil to biodiesel. Physicochemical properties of the as-synthesized HS catalyst were obtained using Fourier Transform Infrared Spectroscopy (FT-IR) for surface chemistry and Scanning Electron Microscopy (SEM) for the morphology. The reaction was conducted at 60 o C for 6 h at a methanol-to-WCO ratio of 7.5:1 using 3 wt.% HS catalyst. The stirring was at 400 rpm to ensure uniform concentration and heat distribution during the reaction. The product obtained after the reaction was analyzed using a pre-calibrated Chromatography-Mass Spectrometer (GC-MS). The SEM images of the solid catalyst and the FTIR spectra show that HS particles were synthesized. The result of the analysis of the product revealed that biodiesel was produced. As far as could be ascertained, this is the first open report on the use of HS as solid catalyst for biodiesel production. The results of the investigation opened up further on-going research efforts in this area in our laboratory and subsequent results will be communicated in the future.

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“…The sodalite was identified by XRD, which proved that sodalite can be synthesized at low temperature. JosefChristian also found that high alkaline salt bearing gels are adequate educts to synthesize sodalite at a very low temperature of 60°C, and he thought the amorphous contribution within source material acts as a sodalite precursor during low temperature crystallization (Josef-Christian et al 2011). In the aspect of structure, Philip thought the sodalite has stabilizing nature and the chlorine group orientates within the center of the framework of β-cage (Philip and Mark.…”

Section: Release Of CLmentioning

confidence: 99%

Solidification/stabilization and leaching behavior of PbCl2 in fly-ash hydrated silicate matrix and fly-ash geopolymer matrix

Gao

Wang

et al. 2014

Environ Sci Pollut Res

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Fly ash (FA) for reuse as a construction material is activated using two methods, to produce hydrated silicate and geopolymer gels. We investigated the solidification/stabilization and leaching behavior of PbCl2 in a geopolymer matrix (GM) and hydrated silicate matrix (HSM), based on FA as the source material, to evaluate the environmental and health risks. The GM and HSM synthetic conditions were 60 °C, 20 % relative humidity (RH), and 12 wt% (6 mol/L) NaOH, and 20 ± 2 °C, ≥ 90 % RH, and 30 wt.%, respectively, based on their compressive strength performances. X-ray diffraction (XRD) showed that Pb participated in hydration and geopolymerization, and was incorporated in the structural components of the hydrated silicate and geopolymer. In leaching experiments, the solidification/stabilization effects of Pb and Cl in the HSM and GM improved with increasing curing time. After long-term curing (28 days), the immobility of Pb in the GM was better than that in the HSM. Sodalite improved the Cl-stabilizing ability of the GM compared with that of the HSM. In static monolithic leaching experiments, HSM and GM had the same Pb-leaching behaviors. Based on the changes in the location of the neutral sphere layer with decreasing acid-neutralizing capacity, Pb release was divided into alkaline-release, stagnation, and acid-release stages. The neutral sphere layer contained the highest Pb concentration during permeation toward the block center from the block edge. This behavior regulation could also apply to other amphoteric metals immobilized by GMs and HSMs.

show abstract

Nanocrystalline sodalite grown from superalkaline NaCl bearing gels at low temperature (333 K) and the influence of TEA on crystallization process

Cited by 16 publications

References 26 publications

The intermediate phase between sodalite and cancrinite: Synthesis of nano-crystals in the presence of Na2CO3/TEA and its thermal- and hydrothermal stability

The intermediate phase between sodalite and cancrinite: Synthesis of nano-crystals in the presence of Na2CO3/TEA and its thermal- and hydrothermal stability

Transesterification of Waste Cooking Oil to Biodiesel over Calcined Hydroxy Sodalite (HS) Catalyst: A preliminary investigation

Solidification/stabilization and leaching behavior of PbCl2 in fly-ash hydrated silicate matrix and fly-ash geopolymer matrix

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