Synthesis of Na-A zeolite from Jeju Island scoria using fusion/hydrothermal method

Lee, Min-Gyu; Park, Jong-Won; Kam, Sang-Kyu; Lee, Changhan

doi:10.1016/j.chemosphere.2018.05.080

Cited by 27 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These elements were carbon, oxygen, sodium, magnesium, aluminum, silicon, potassium, calcium, iron, cobalt, nickel, and molybdenum (see Table 2). The presence of these nine elements in the raw zeolite announces the possible presence of the oxides of these elements (Na 2 O, K 2 O, MgO, Al 2 O 3 , SiO 2 , CaO, FeO, Fe 2 O 3 ), 77 while the presence of Ni, Co, and Mo foreshadowed the likely presence of NiO, Co x O y , and Mo x O y , respectively. The possible presence of these oxides was inevitable as the catalyst was not reduced after calcination.…”

Section: Methodsmentioning

confidence: 90%

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiO_x–MoO_x–CoO_x/Zeolite

Asiedu

Kumar

2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Process optimization and reaction kinetics of catalytic transfer hydrogenation (CTH) of waste cooking oil (WCO) into jet fuels using zeolite-supported Ni−Co−Mo oxides catalyst in a packed-bed reactor were studied. Experiments were conducted at three different temperatures (360, 390, and 420 °C) to determine the rate constants, the order of reaction, and the activation energy. The kinetics study showed a first-order reaction with the activation energy estimated to be 84 ± 18.7 kJ/mol WCO with 95% confidence. Design of experiment (DOE) was employed to estimate the optimum reaction parameters using the polynomial model (383.7 °C; 14.8 bar; WCO-to-2-propanol ratio = 1.57 mL/ mL; weight hourly space velocity (WHSV) = 6.7 h −1 ). Validation of the model at the optimum operating conditions generated 80% yield of liquid products with 77% alkanes, 3.8% alkenes, and 12.3% aromatics composition, and 6.7% gases, and 100% conversion of WCO. The catalyst was prepared via the wet impregnation method and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer−Emmett−Teller (BET) adsorption and desorption, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA). Characterization of the catalyst revealed a cubic structure, which was maintained after one cycle of CTH reaction. Present in both the fresh and the used catalysts were Na 2 O, K 2 O, MgO, Al 2 O 3 , SiO 2 , CaO, FeO, Fe 2 O 3 , which highlight the composition of zeolite. The active sites were dominated by Co 3+ , Ni 2+ , and Mo 6+ that were respectively present in the form of Co 2 O 3 , NiO, and MoO 3 .

show abstract

Section: Methodsmentioning

confidence: 90%

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiO_x–MoO_x–CoO_x/Zeolite

Asiedu

Kumar

2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…According to Aylele et al [ 43 ], the advantage of alkaline fusion in the synthesis of zeolite A is the possibility of using low-quality primary kaolin without purification, whereas the conventional hydrothermal method requires high-quality raw material. The suitability of the hydrothermal method preceded by alkaline fusion in the synthesis of Na-A zeolite (Z-S1) from one of the volcanic rocks (scoria) was demonstrated by Lee et al [ 44 ]. Based on their results, the authors concluded that control of the NaOH/precursor ratio is important to ensure high crystallinity of the zeolite product, as well as the size of the particles, which decreases with increasing alkali content in the medium.…”

Section: Zeolite Synthesis Methodsmentioning

confidence: 99%

Zeolite Properties, Methods of Synthesis, and Selected Applications

Kordala,

Wyszkowski

2024

Molecules

View full text Add to dashboard Cite

Zeolites, a group of minerals with unique properties, have been known for more than 250 years. However, it was the development of methods for hydrothermal synthesis of zeolites and their large-scale industrial applications (oil processing, agriculture, production of detergents and building materials, water treatment processes, etc.) that made them one of the most important materials of the 20th century, with great practical and research significance. The orderly, homogeneous crystalline and porous structure of zeolites, their susceptibility to various modifications, and their useful physicochemical properties contribute to the continuous expansion of their practical applications in both large-volume processes (ion exchange, adsorption, separation of mixture components, catalysis) and specialized ones (sensors). The following review of the knowledge available in the literature on zeolites aims to present the most important information on the properties, synthesis methods, and selected applications of this group of aluminosilicates. Special attention is given to the use of zeolites in agriculture and environmental protection.

show abstract

“…The samples sieved by 0.425 mm or less were dried at 110°C for 24 h and then used in the synthesis of zeolitic materials. The synthesis of the zeolitic materials was carried out using the fusion/hydrothermal method which is the same procedure as the previous study [24]. The molar ratio of SiO 2 /Al 2 O 3 was fixed to 2.5, and then the mixture adjusted to have a NaOH/Jeju volcanic rocks ratio of 1.8 was fused at 550°C for 1 h. The fused sample was aged at 30°C for 5 h and crystallized at 90°C for 5 h while stirring in aqueous solutions to prepare the zeolitic materials.…”

Section: Synthesis Of Zeolitic Materialsmentioning

confidence: 99%

Kinetic and isothermal adsorption properties of strontium and cesium ions by zeolitic materials synthesized from Jeju volcanic rocks

Lee

Kam

Lee

2020

Environmental Engineering Research

Self Cite

View full text Add to dashboard Cite

The study focused on the removal of Sr and Cs ions in aqueous solutions by zeolitic materials synthesized from Jeju volcanic rocks using a fusion/hydrothermal method. The synthesis of the zeolitic materials was carried out using the fusion/hydrothermal method to reduce crystallization time. Morphological structures of the zeolitic materials could be confirmed to be the Na-A zeolite structure and crystalline with the chamfered-edged structure. In the adsorption experiment, as the initial concentrations of the Sr and Cs ions increased, it took longer to reach adsorption equilibrium. The adsorption kinetics and isotherms of Sr and Cs ions were predicted well by the pseudo-2nd-order and Langmuir isotherm models, respectively. The maximum adsorption capacities of Sr and Cs ions by the Langmuir isotherm model were 154.8 mg/g and 144.0 mg/g, respectively. The zeolitic materials prepared in this study is considered as an effective adsorbent for removing Sr and Cs ions in aqueous solutions.

show abstract

Synthesis of Na-A zeolite from Jeju Island scoria using fusion/hydrothermal method

Cited by 27 publications

References 16 publications

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiO_x–MoO_x–CoO_x/Zeolite

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiO_x–MoO_x–CoO_x/Zeolite

Zeolite Properties, Methods of Synthesis, and Selected Applications

Kinetic and isothermal adsorption properties of strontium and cesium ions by zeolitic materials synthesized from Jeju volcanic rocks

Contact Info

Product

Resources

About

Synthesis of Na-A zeolite from Jeju Island scoria using fusion/hydrothermal method

Cited by 27 publications

References 16 publications

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiOx–MoOx–CoOx/Zeolite

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiOx–MoOx–CoOx/Zeolite

Zeolite Properties, Methods of Synthesis, and Selected Applications

Kinetic and isothermal adsorption properties of strontium and cesium ions by zeolitic materials synthesized from Jeju volcanic rocks

Contact Info

Product

Resources

About

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiO_x–MoO_x–CoO_x/Zeolite

Kinetics and Optimization of Catalytic Transfer Hydrogenation of WCO Using 2-Propanol as a Hydrogen Donor over NiO_x–MoO_x–CoO_x/Zeolite