Supercritical hydrothermal synthesis of zeolites from coal fly ash for mercury removal from coal derived gas

Wang, Jiancheng; Li, Dekui; Ju, Fenglong; Han, Lupeng; Chang, Liping; Wang, Bao

doi:10.1016/j.fuproc.2014.10.020

Cited by 54 publications

(26 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

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

show abstract

“…[1][2][3] This solid waste is considered harmful to the environment due to the presence of heavy metals and other potentially toxic substances. [4][5][6][7] Different applications are reported in the literature, including in the manufacturing of concrete, tiles and ceramic products and as a cement additive. 2,7,8 However, this demand is often not enough to exhaust the amount of fly ash generated in the burning of vast quantities of coal worldwide, which can result in improper disposal.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7] Different applications are reported in the literature, including in the manufacturing of concrete, tiles and ceramic products and as a cement additive. 2,7,8 However, this demand is often not enough to exhaust the amount of fly ash generated in the burning of vast quantities of coal worldwide, which can result in improper disposal. 9 By contrast, an alternative application has attracted scientific interest for its use in the synthesis of zeolites due to the characteristics of the coal fly ash, which include high silicon and aluminum levels in the amorphous phase.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

Ferrarini¹,

Cardoso²,

Alban³

et al. 2018

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

The high Si and Al contents in the amorphous phase of coal fly ash have been used for its conversion into zeolites. This process converts a toxic low-value by-product into a product used in a number of environmental applications, but has the disadvantage of introducing contaminants. Despite the large number of studies on the conversion of fly ash into zeolites, few report this drawback or discuss the efficiency of the proposed processes from a technical or ecological perspective. In this respect, the present study conducts a detailed assessment of two routes for integrated hydrothermal synthesis of zeolites 4A and Na-P1 obtained from coal fly ash. The processes are evaluated and compared in relation to the presence of undesirable metals and elements in the different steps of synthesis, as well as the feedstock and final product. Different performance parameters are presented and applied in the assessment of both processes and the most sustainable is recommended.

show abstract

“…La obtención de zeolitas a partir de cenizas volantes ha sido reportada en diversos trabajos bajo el método de síntesis hidrotérmica [2][3][4][5]. Los productos obtenidos luego del proceso cubren un amplio rango de estructuras zeolíticas pero con bajo rendimiento en la conversión.…”

Section: Introductionunclassified

Zeolitas LTA y FAU obtenidas a partir de cenizas volantes y su aplicación en remoción de Cromo

Arroyave-Manco

Arboleda

Hoyos-Ayala

et al. 2018

DYNA

View full text Add to dashboard Cite

In this paper, the process for the synthesis of LTA and/or FAU zeolites from waste materials from mining and manufacturing industry from Antioquia (Colombia) was described. The product was used as adsorbent for the removal of Cr (III) in solutions prepared in the laboratory. The waste materials were characterized by X-ray fluorescence, and X-ray diffraction. The zeolites were characterized by X-ray diffraction, X-ray fluorescence, scanning electron microscopy (SEM) and BET area. Absorption data in Cr(III) removal tests were obtained by elemental composition from atomic absorption spectroscopy, and evaluated by Langmuir, Freundlich and Temkin models, and four kinetics models. The results showed the formation of zeolites from waste materials, and effective in adsorption tests of Cr (III).

show abstract

Supercritical hydrothermal synthesis of zeolites from coal fly ash for mercury removal from coal derived gas

Cited by 54 publications

References 31 publications

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

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

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

Zeolitas LTA y FAU obtenidas a partir de cenizas volantes y su aplicación en remoción de Cromo

Contact Info

Product

Resources

About