Spectroscopic investigation of hydrothermally synthesized zeolites from expanded perlite

Król, Magdalena; Mozgawa, W.; Morawska, Justyna; Pichór, Waldemar

doi:10.1016/j.micromeso.2014.05.017

Cited by 35 publications

(18 citation statements)

References 24 publications

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“…The presence of the band at 965 cm -1 can be explained as both asymmetric stretching vibrations of Si-O(Al) bonds realized in the structures of sodalite and mullite [20], or less likely as Al-OH stretching vibrations of aluminum in the octahedral position [21].…”

Section: The Results Of Research and Discussionmentioning

confidence: 99%

“…Literature data [7][8][9] show that the zeolite structures can be synthesized not only in metakaolinite-based material. Actually, zeolites can be synthesized under hydrothermal conditions by heating many other aluminosilicate raw materials such as fly ash [10] or volcanic glasses in the presence of alkaline solutions [11][12]. Resulting zeolites such Na-P1, X, A, and others have a high industrial application potential due to the high cation exchange capacity (CEC) values [10].…”

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confidence: 99%

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Synthesis of the Sodalite by Geopolymerization Process Using Coal Fly Ash

Król¹,

Rożek²,

Mozgawa³

2017

Pol. J. Environ. Stud.

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IntroductionGeopolymers, also called inorganic polymers, are classified as synthetic aluminosilicate materials characterized by many interesting properties. This group of materials has gained a lot of attention in the past 10 years (measured by increasing number of publications) and raised high expectations concerning their applicability. Geopolymers are usually hard, mechanically resistant materials, therefore many attempts to substitute Portland cement in the construction industry have been taken [1]. Despite the huge number of publications devoted to this family and hundreds of new examples of these materials, researching them is still pioneering [2]. Attempts to systematize their structures and properties are just beginning to appear.Geopolymers are considered as zeolite precursors, thus zeolites are often detected in geopolymer gels. Activation of metakaolinite with sodium silicate and sodium hydroxide solutions at various temperatures (20-100ºC) can lead to the geopolymer-zeolite hybrid materials containing zeolite A, sodalite, and zeolite Y [3]. During hydrothermal treatment at low temperature, depending on the synthesis conditions, metakaolin-based geopolymeric gel transforms into zeolite ZSM-20, zeolite Na-P1, faujasite, sodalite, and analcime [4]. Metakaolin-based geopolymeric gel was also used for hydrothermal preparation of a faujasite zeolite membrane for alcohol/water separation [5]. On the other hand, non-hydrothermal preparation of Na-A zeolite membranes from chemosynthetic Al 2 O 3 -SiO 2 powder and sodium silicate solution by the geopolymer gel thermal conversion at 60ºC is possible [6].Pol. J. Environ. Stud. Vol. 26, No. 6 (2017), 2611-2617 AbstractThis study investigated the influence of alkali activation process conditions on the amount and types of zeolites in the resultant geopolymers. The products were formed during the alkaline activation of coal fly ash with the use of aluminium and sodium hydroxide solution. Geopolymers were cured at 80ºC for 24 h. The effects of reaction systems' constitution (expressed as SiO 2 /Al 2 O 3 and Al 2 O 3 /Na 2 O molar ratios) on the phase composition and structure of obtained products were determined. The results indicated that the products obtained from such hydrothermal treatment demonstrated the characteristics of zeolite-like materials -sodalite. By using the appropriate composition of the initial solution (sufficiently high concentration of NaOH and aluminum carrier), it is possible to synthesize the sodalite phase efficiently in an amorphous matrix.

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Section: The Results Of Research and Discussionmentioning

confidence: 99%

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confidence: 99%

Synthesis of the Sodalite by Geopolymerization Process Using Coal Fly Ash

Król¹,

Rożek²,

Mozgawa³

2017

Pol. J. Environ. Stud.

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“…The connection of tetrahedra generates the existence of empty spaces in the structure [10]. Due to such properties as high ion exchange, high thermal, mechanical and chemical stability, zeolites are commonly used as ion exchangers, molecular sieves, catalysts and adsorbents [11][12].…”

Section: Introductionmentioning

confidence: 99%

Limitation of the environmental impact of ashes from combustion of sewage sludge by the synthesis of zeolites

Latosińska

2017

E3S Web Conf.

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Abstract. The combustion of municipal sewage sludge allows for the recovery of renewable energy. However, it simultaneously causes the formation of ash which is not neutral for the environment. The study presents the research on the possibility of using sewage sludge ash as a raw material for the synthesis of zeolites. The synthesis of zeolites was performed with the use of an indirect fusion method and a direct hydrothermal method. The research on sewage sludge ash after zeolitization included the identification of crystalized phases, the observation of changes of ash particles surface and the measurement of cation exchange capacity (CEC). The research results proved that optimal conditions for the formation of zeolite Y were the synthesis with the indirect fusion method at the sewage sludge ash to hydroxy sodalite ratio of 1:1.8, the activation temperature of 60 o C and the crystallization temperature of 90 o C. Hydroxy sodalite was found in samples from both methods of zeolitization. However, in the case of direct hydrothermal method, particles of hydroxy sodalite structure were less numerous indicating a small conversion of sewage sludge ash to crystalline zeolite. CEC values comparable to commercial zeolites resulted from zeolitization with the indirect fusion method.

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“…Its structure consists of a framework of 4-and 6-membered rings of SiO 4 and AlO 4 tetrahedra, and the Si:Al ratio equals 1:1, which is the lowest possible ratio for zeolite group minerals. There are many reports for the synthesis of hydroxysodalite from various raw materials, such as coal fly ash [6]- [13], paper sludge ash [14-[23], oil shale ash [24], [25], waste sandstone cake [26]- [29], natural kaolinite [30], metakaolin [31], expanded perlite [32], waste porcelain [33], natural clinker [34], thermally treated sediment [35] and so on.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the Removal of Hydrogen Chloride Gas Using Hydroxysodalite at High Temperatures

Wajima¹

2016

IJCEA

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Abstract-Hydrogen chloride (HCl) is an acidic pollutant that is present in the flue gases of most municipal and hazardous waste incinerators. It is important to treat gaseous HCl in incineration streams efficiently to avoid adverse environmental consequences. The removal of hydrogen chloride gas using hydroxysodalite (Na 8 Al 6 Si 6 O 24 (OH) 2 ) at high temperatures (600-900 °C) using a fixed-bed flow-type reactor was investigated in this study. HCl was efficiently removed from N 2 containing 1000-ppmv HCl with a reaction time of 2 h at high temperatures. The hydroxysodalite reacted efficiently with the HCl gas at temperatures between 600 and 800 °C, and was transformed into sodalite (Na 8 Al 6 Si 6 O 24 Cl 2 ). The amount of HCl fixed increased as the temperature increased to 800 °C but decreased when the temperature was increased to 900 °C because some of the hydroxysodalite and sodalite was transformed into nepheline (NaAlSiO 4 ). The most chlorine was fixed at 800 °C (the amount fixed was 56 mg/g). The reaction kinetics were assessed, and the pseudo-first-order and pseudo-second-order rate constants were calculated. Removal experiments showed that the removal process followed pseudo-second-order kinetics rather than pseudo-first-order kinetics. Increasing the temperature of the fixed-bed reactor to 800 °C increased the amount of HCl that was removed while keeping the removal kinetics almost the same.

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Spectroscopic investigation of hydrothermally synthesized zeolites from expanded perlite

Cited by 35 publications

References 24 publications

Synthesis of the Sodalite by Geopolymerization Process Using Coal Fly Ash

Synthesis of the Sodalite by Geopolymerization Process Using Coal Fly Ash

Limitation of the environmental impact of ashes from combustion of sewage sludge by the synthesis of zeolites

Kinetics of the Removal of Hydrogen Chloride Gas Using Hydroxysodalite at High Temperatures

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