Characterization of Na-X, Na-A, and coal fly ash zeolites and their amorphous precursors by IR, MAS NMR and XPS

Shigemoto, Naoya; Sugiyama, Shigeru; Hayashi, Hiromu; Miyaura, K.

doi:10.1007/bf00356720

Cited by 99 publications

(55 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This band shifted slightly and became shaper as the amorphous material was transformed into crystalline zeolites A. The IR band at 870 cm −1 , which can be assigned to T OH bond in the amorphous precursor of zeolite A, was also observed by Shigemoto [31]. Decottignies [47] noted that this band disappears as the sample became more crystalline.…”

Section: Discussionmentioning

confidence: 66%

See 1 more Smart Citation

In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

Musyoka

Petrik

Hums³

et al. 2012

Catalysis Today

View full text Add to dashboard Cite

In this study, high phase purity of zeolite A was prepared from coal fly ash precursors. The molar regime of both the clear solution extract and unseparated fly ash slurry was adjusted to achieve the right com-position for zeolite A crystallization. The formation process for zeolite A from coal fly ash precursors was monitored in detail using an in situ ultrasonic system and was complemented by use of ex situ techniques such as XRD, FTIR, SEM and FTIR. The findings from both the in situ ultrasonic monitoring process and ex situ techniques clearly contributed significantly in unmasking the formation process of zeolite A from coal fly ash compared to previous studies reported in the literature. The study also enriches the existing body of literature by deeply investigating the gel-solutioncrystal interactions starting from this complex feedstock. Comparable ultrasonic signals were generated when both clear and unseparated fly ash based precursor solutions were used during the zeolite synthesis process.

show abstract

Section: Discussionmentioning

confidence: 66%

“…IR spectroscopy has been extensively used to monitor the development of crystallinity during zeolite synthesis [31]. Fig.…”

Section: 24ftir Analysismentioning

confidence: 99%

In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

Musyoka

Petrik

Hums³

et al. 2012

Catalysis Today

View full text Add to dashboard Cite

show abstract

“…12 The conversion of CFA into zeolitic material has long been studied by researchers from different countries. [13][14][15][16][17][18][19][20][21][22][23] Yields for CFA direct conversion (one step synthesis process) into zeolites can vary from 50 to 75%. 24 Applications for zeolites synthesized using CFA are the same as those of natural zeolites and zeolites made from natural materials (kaolin, diatomites) or other aluminosilicate industrial wastes.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…Experimental procedure and conditions were based on the results of Shigemoto et al [12,13] and Wajima et al [14][15][16] 10 g of the ash was mixed with 12 g of NaOH powder and ground to obtain a homogeneous mixture. This mixture was then heated in a nickel crucible in air at 600℃ for 6 h. The resultant material was cooled to room temperature and ground again to obtain powdered fused material.…”

Section: Alkali Fusionmentioning

confidence: 99%

“…However, their structural heterogeneity, together with the poor properties as ion exchangers of stable zeolites, limits their applications. In order to overcome these shortcomings, a variation of the process in which an alkaline fusion stage is introduced prior to the conventional zeolite synthesis, usually known as the fusion method, has been suggested [12,13]. This significantly improves the zeolitization process and the product is typically confirmed as highly crystalline zeolites from the faujasite group, because almost all parts of the ash is transformed into soluble phases via alkali fusion in order to crystallize zeolite crystal.…”

Section: Introductionmentioning

confidence: 99%

Material Conversion from Various Incinerated Ashes Using Alkali Fusion Method

Wajima

Sugawara

2010

Int.J.Soc.Mater.Eng.Resour.

View full text Add to dashboard Cite

Conversion of three different types of incineration ash, coal fly ash (CFA), paper sludge fly ash (PSFA) and industrial waste incineration fly ash (IWIFA) into useful materials using the alkali fusion method is attempted. The chemical and mineralogical compositions of these ashes differed. [KCl]. Zeolites (zeolite-X, -A, -P and hydroxysodalite), hydrogrossular (katoite), and calcite were synthesized from the ashes. With an increasing Ca content of the ash, the Si concentration in the solution decreased, and the main product phases changed from zeolite (aluminosilicate) to hydrogrossular (calcium aluminosilicate), and finally to calcite (calcium carbonate). The observed concentrations of Si, Al, and Na in the solution during the reaction explain the crystallization of these phases.

show abstract

Characterization of Na-X, Na-A, and coal fly ash zeolites and their amorphous precursors by IR, MAS NMR and XPS

Cited by 99 publications

References 24 publications

In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

In situ ultrasonic monitoring of zeolite A crystallization from coal fly ash

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

Material Conversion from Various Incinerated Ashes Using Alkali Fusion Method

Contact Info

Product

Resources

About