Journal ArticleDOI
Synthesis of Zeolite A, X and P from a South African Coal Fly Ash
TLDR
In this article, the synthesis conditions for generating high quality zeolite type Na-P1, A, and X from a South African coal fly ash were identified in a study.Abstract:
Synthesis conditions for generating high quality zeolite type Na-P1, A, and X from a South African coal fly ash were identified in this study. XRF, XRD, FTIR and SEM analytical techniques were used to characterize the starting fly ash feedstock and the resulting synthesis product. Synthesis of these high quality zeolites types is expected to provide a competitive alternative for recycling the ever increasing quantity of fly ash produced in the South African coal-fired power plants. This approach will not only be environment friendly but could also be attractive from an economic point of view since the cost of disposal of fly ash could be offset by the income generated from the sale of the synthesized zeolitic materials.read more
Citations
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Journal ArticleDOI
Conversion of coal fly ash to zeolite utilizing microwave and ultrasound energies: A review
TL;DR: In this article, the progress made in the conversion of coal fly ash to zeolite and its applications while strongly focusing on the utilization of microwave and ultrasound energies in achieving this goal is reviewed.
Journal ArticleDOI
Influence of Surface Modification on Selective CO2 Adsorption: A Technical Review on Mechanisms and Methods
TL;DR: A comprehensive review of the recent attempts and advancements made within the scientific community in the experimental applications of such methods to enhance CO2 capture via adsorption processes can be found in this article.
Journal ArticleDOI
Synthesis of zeolite A from coal fly ash using ultrasonic treatment--A replacement for fusion step.
TL;DR: This study effectively developed a novel process to replace the energy intensive fusion step with a short, easy and inexpensive treatment for the synthesis of zeolite A.
Journal ArticleDOI
Thermal stability studies of zeolites A and X synthesized from South African coal fly ash
TL;DR: In this article, the thermal stability of zeolites synthesized from coal fly ash was studied by evaluation of TGA-DTA curves obtained on increasing the tem- perature and by in-situ temperature-programmed XRD analysis.
Journal ArticleDOI
Synthesis, characterisation and CO2 adsorption potential of NaA and NaX zeolites and hydrotalcite obtained from the same coal fly ash
TL;DR: In this paper, two types of zeolites (NaXFA and NaAFA) were successfully synthesised from South African coal combustion fly ash, and their CO2 adsorption properties, as well as those of a hydrotalcite (HTFA) synthesized from the same fly ash in previous work, were investigated and compared.
References
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Journal ArticleDOI
Synthesis of zeolites from coal fly ash: an overview
Xavier Querol,Natalia Moreno,J.C Umaña,Andrés Alastuey,E. Hernández,Angel Lopez-Soler,F. Plana +6 more
TL;DR: An overview on the methodologies for zeolite synthesis from CFA, and a detailed description of conventional alkaline conversion processes, with special emphasis on the experimental conditions to obtain high cation exchange capacity (CEC) zeolites is given in this article.
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Mechanism of zeolite synthesis from coal fly ash by alkali hydrothermal reaction
TL;DR: In this article, the mechanism of zeolite crystallization and the role of alkali solution on the synthesis reaction were considered. And the changes in various physical and chemical properties, such as crystal structure, surface structure and cation exchange capacity, of the obtained zeolites and the dissolved amount of Si 4+ and Al 3+ in alkali solutions were investigated during the hydrothermal reaction.
Journal ArticleDOI
Selective formation of Na-X zeolite from coal fly ash by fusion with sodium hydroxide prior to hydrothermal reaction
TL;DR: In this article, electron microscopy images of cubic and octahedral crystals characteristic of Na-A and Na-X zeolite, respectively, obtained from fly ash, are given.
Journal ArticleDOI
Microwave-assisted zeolite synthesis from coal fly ash in hydrothermal process
TL;DR: In this paper, the effect of microwave irradiation on the zeolite formation was investigated with emphasis on the change in yield of Zeolite during the reaction, which is due to the stimulated dissolution of SiO2 and Al2O3 from coal fly ash.
Journal ArticleDOI
Synthesis of ZSM-5 zeolite from lignite fly ash and rice husk ash
TL;DR: In this paper, the authors investigated factors affecting the yield of ZSM-5 zeolite synthesized from fly ash, i.e., the SiO 2 /Al 2 O 3 mole ratio, the presence of tetrapropyl ammonium bromide (TPABr), the holding temperature and time, and the initial pressure were investigated.