Synthesis and characterization of Na-X, Na-A and Na-P zeolites and hydroxysodalite from metakaolinite

Novembre, Daniela; Sabatino, B. Di; Gimeno, D.; Pace, Carla

doi:10.1180/claymin.2011.046.3.339

Cited by 82 publications

(51 citation statements)

References 38 publications

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“…In contrast to the sodalite, this phase typically crystallizes under milder conditions. It was suggested that at higher temperatures and NaOH concentrations, zeolite Na-P 1 is unstable and transforms into sodalite, which is confirmed in the related literature [36]. Additionally, an intense peak derived from a zeolite ZK-5 can be seen in diffraction patterns of samples obtained at 80 to 90°C.…”

Section: Resultssupporting

confidence: 71%

“…For the samples obtained at 90°C using 5.0 M NaOH the first quantity of crystalline phase, zeolite A, is detectable after 1 h. Its quantity is greatest after 3 h and then gradually decreases: zeolite A completely disappears after 6 h. At the same time sodalite crystallizes. It was confirmed that extending the synthesis time results in the transformation of the zeolite X and zeolite A into zeolite Na-P 1 and sodalite [1,21,36]. Lengthening reaction time from 24 to 72 h resulted in slight increase in the amount of the resulting phases.…”

Section: Resultssupporting

confidence: 57%

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Low-temperature synthesis of zeolite from perlite waste — Part I: review of methods and phase compositions of resulting products

Król

Morawska

Mozgawa

et al. 2014

Materials Science-Poland

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In this paper a review of the recent studies on the synthesis of zeolites from expanded perlite under hydrothermal conditions is presented. Attention is paid to possible outcomes of synthesis from low cost glass material, such as perlite. The study also investigates the phase composition of zeolitic materials obtained by modification of by-product derived from an expanded perlite production process. The synthesis was made using the hydrothermal method with sodium hydroxide under autogenous pressure at a temperature below 100°C for 1 to 72 h. It was possible to obtain a zeolitic material at a temperature as low as 60°C using 4.0 M NaOH. The X-ray diffraction pattern showed the biggest peak intensity of zeolite X with 4.0 M NaOH at the temperature of 70°C. During synthesis at higher temperature zeolite Na-P 1 (with 3.0 M NaOH at 90°C) and hydroxysodalite (with 5.0 M NaOH at 90°C) were obtained.

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Section: Resultssupporting

confidence: 71%

Section: Resultssupporting

confidence: 57%

Low-temperature synthesis of zeolite from perlite waste — Part I: review of methods and phase compositions of resulting products

Król

Morawska

Mozgawa

et al. 2014

Materials Science-Poland

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“…As expected, this effluent is rich primarily in Si, Al and K (1000-150 mg L ). 61 Moreover, in addition to containing residual Al and Si, the effluent also exhibited high pH (ca. 14) and Na content, which is relevant for its reuse in the synthesis process.…”

Section: Characterization Of Washing Waters and Synthesis Effluentmentioning

confidence: 99%

“…As commented previously, the characterization of zeolites in terms of trace elements is relatively unexplored in the literature. 45,59 Most studies 60,61 investigate only the main components (Al, Na and Si) of zeolite structure, with only a few 45,47,48 also characterizing majority elements. The presence of trace elements in zeolites obtained from CFA is even more unusual and only two studies were found.…”

Section: Chemical Compositionmentioning

confidence: 99%

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Ferrarini¹,

Cardoso²,

Paprocki³

et al. 2016

Journal of the Brazilian Chemical Society

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Coal fly ash has been proposed as an alternative raw material for zeolite synthesis, however, the mobilization of toxic elements of this material into zeolite products, washing water and effluent is rarely addressed. In this study, Brazilian coal fly ash was used in the integrated synthesis (two steps) of zeolites Na-P1 and 4A and the distribution of approximately 40 major, minor and trace elements was investigated in all the input and output flows involved in the process. The mobilization of several elements was observed in the zeolite products, a number of which are highly toxic, such as As, Cd, Cr, Ni and Pb. With regard to the amount present in the ash, both zeolites were enriched in several elements, such as Ni in zeolite Na-P1 and As in zeolite 4A. The latter exhibited high purity, with most of the elements investigated having concentrations close to those measured in commercial zeolite 4A. Important information was gathered regarding zeolite synthesis using fly ash, which will ensure safer application of these materials and, if necessary, propose a contaminant-free synthesis route.

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“…Moreover, various manufacturing and agro wastes have been studied as a starting material in synthesizing zeolite [5][6][7][8]. The chemical composition of the raw material used, particularly the presence of silicon and aluminum oxides, is one of the important factors responsible for obtaining various types of zeolites [9]. Moreover, the temperature, pressure, times and SiO 2 /Al 2 O 3 ratio are crucial parameters which play key roles in the synthesis processes.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Grela

Łach

Bajda

et al. 2018

J Therm Anal Calorim

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Currently, there has been a growing interest of zeolite materials for industrial and scientific purpose. Synthetic zeolites are more often used than natural ones due to its higher purity and more uniform particle sizes. Numerous investigations are conducted in searching of inexpensive raw materials suitable for zeolite synthesis. Moreover, the temperature, pressure, times and SiO 2 /Al 2 O 3 ratio are the most important parameters which play key roles in the synthesis processes. Due to such a large number of factors that affect the process, zeolite synthesis has been undergoing constant development. Nowadays, researchers focus on the methods of synthesizing zeolites at ambient temperature and pressure. Metakaolin and tuff are natural raw materials which can be turned into a brand new class of synthetic zeolites. However, each requires different method of synthesis in order to obtain a material with best physical properties. This paper discusses the process of alkaline activation of synthetic zeolites from natural raw materials: volcanic tuff excavated in Filipowice and metakaolin obtained from Rominco company. Two methods: fusion and low-temperature synthesis, were used in the presented research. Moreover, the physical properties of raw materials and zeolites obtained were shown. Based on the XRD analysis, it was verified that materials after the synthesis process contained zeolites A, Na-X and faujasite-Na. Furthermore, the dehydration and thermal decomposition phenomena of the tuff and metakaolin before and after the synthesis process were determined by coupled TG/MS techniques.

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Synthesis and characterization of Na-X, Na-A and Na-P zeolites and hydroxysodalite from metakaolinite

Cited by 82 publications

References 38 publications

Low-temperature synthesis of zeolite from perlite waste — Part I: review of methods and phase compositions of resulting products

Low-temperature synthesis of zeolite from perlite waste — Part I: review of methods and phase compositions of resulting products

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

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