Hydrothermal synthesis of nanostructure NaA zeolite: The effect of synthesis parameters on zeolite seed size and crystallinity

Bayati, Behrouz; Babaluo, Ali Akbar; Karimi, Reza

doi:10.1016/j.jeurceramsoc.2008.03.033

Cited by 77 publications

(26 citation statements)

References 11 publications

(14 reference statements)

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“…However, a mixture of HS particles with cubic shape and nanorod-like shape were also observed. The observed morphology is consistent with previous studies where other shapes of hydroxy sodalite such as nanorods, flower-like, urchin, thread-ball and cubic/octahedral shape have been reported [16][17]. The FTIR spectrum in Figure I (b) shows the asymmetric stretching vibration of T-O-T (T-Si, Al) at ~1000 cm -1 .…”

Section: Resultssupporting

confidence: 91%

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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Section: Resultssupporting

confidence: 91%

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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“…After vigorous agitation for one hour, the solution underwent ultrasonic treatment for 30 min. Once again, vigorous agitation was applied for 5 h. Afterwards, the solution was poured into Teflon jars and placed in stainless steel autoclaves (Bayati et al, 2008). The autoclaves were placed in an oven previously heated to 70°C in order to carry out the ageing process for 12 h. Following the ageing process, the hydrothermal treatment was carried out at 150°C and 200°C for 6, 12, 24 and 36 h. Subsequently, the autoclaves were removed from the oven and cooled in running water.…”

Section: Methodsmentioning

confidence: 99%

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Jahn

Carreño

Foletto

2011

Braz. J. Chem. Eng.

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-An investigation was carried out on the synthesis of titanium dioxide nanopowders via the hydrothermal method, examining the influence of temperature (150ºC and 200ºC) and reaction time (6 to 36 h). The resulting powders were characterized by X-ray diffraction, infrared absorption spectrophotometry, transmission electron micrographs and surface area. The X-ray diffraction revealed that there was formation of a pure crystalline phase, consisting only of anatase for all conditions of synthesis. Both temperature and reaction time proved to have a slight influence on the crystallite size (from 9 to 17 nm) and a significant influence on the surface area (from 86 to 168 m 2 .g -1 ).

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“…5) Hydroxy sodalite (HS) is an aluminosilicate-based, microporous-structured material. Tetrahedral SiO 4 and AlO 4 units are linked in six-membered chains, and they create molecular-pore sizes of 2.8 ¡. HS and zeolite A have similar microporous structures, which are composed of three-dimensional channels and cages.…”

Section: Introductionmentioning

confidence: 99%

Windshield-waste-driven synthesis of hydroxy sodalite

Kim

Choi

Kim

et al. 2015

J. Ceram. Soc. Japan

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We demonstrated the synthesis of hydroxy sodalite (HS) via a simple hydrothermal process using windshield waste as the source material. Acid-treated waste glass was directly used as the silicate precursor. The syntheses were conducted under various NaOHprecursor contents for 1, 12, and 24 h. The crystal structure and morphology of the HS were identified by X-ray diffraction and field-emission scanning electron microscopy. As per the results of the analyses, the HS and zeolite-A phases formed with low NaOH content, but HS was successfully synthesized in a single phase with a Na 2 O:SiO 2 :Al 2 O 3 molar ratio of 2.2:1:1 over the course of 24 h. For uniform and high-purity HS crystals, the sizes of the particles of windshield waste were reduced via a highenergy milling process, and then we conducted the hydrothermal procedure under same conditions. Finally, uniformly sized HS crystals were produced with an average diameter of 3¯m. These optimized conditions were not only scientifically valuable to understand the formation process, but this process should also accelerate windshield-waste recycling.

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Hydrothermal synthesis of nanostructure NaA zeolite: The effect of synthesis parameters on zeolite seed size and crystallinity

Cited by 77 publications

References 11 publications

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

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

Temperature and reaction time effects on the structural properties of titanium dioxide nanopowders obtained via the hydrothermal method

Windshield-waste-driven synthesis of hydroxy sodalite

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