Crystallization of K–L and K–W zeolites from fly-ash

Belardi, G.; Massimilla, S; Piga, L.

doi:10.1016/s0921-3449(98)00016-0

Cited by 36 publications

(15 citation statements)

References 21 publications

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“…The significant amounts of Si and Al in amorphous and crystalline phases make a possibility to apply fly ash as a source material for synthesizing zeolites 7 . Although fly ash is currently used for the production of cement and concrete as backfilling in mining and agriculture, it is also exploited in a variety of civil engineering applications 8 . The most interesting applications of fly ash that emerged in the middle of the 1980s is the synthesis of zeolites 5 .…”

Section: Introductionmentioning

confidence: 99%

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Thuadaij¹,

Nuntiya²

2012

ScienceAsia

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In this study, a Na-x zeolite was synthesized by using metakaolin from Narathiwat kaolinite, amorphous silica from rice husk ash, and high CaO fly ash from the Mae Moh electrical plant by using the alkaline fusion method. The mixture of fly ash, amorphous silica and metakaolin was fused in NaOH followed by incubation at 70°C for 24 h. An amorphous silica from rice husk ash and metakaolin were added to high CaO fly ash to increase the SiO 2 /Al 2 O 3 ratio of fusion materials. The fused mixtures of high CaO fly ash, amorphous silica and metakaolin were mixed in the weight ratio of 1:3:6 giving a SiO 2 /Al 2 O 3 ratio of 3.25 to achieve a Na-x zeolite phase. The synthesized zeolite was characterized by XRD, SEM, FTIR, and BET techniques. The CEC and specific surface area of the Na-x zeolite were 420 meq 100 g −1 and 398 m 2 /g, respectively.

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Section: Introductionmentioning

confidence: 99%

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Thuadaij¹,

Nuntiya²

2012

ScienceAsia

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“…The amount of coal fly ash formed is approximately 500 million tonnes per year and is predicted to increase. The global recycling rate of fly ash is only 15% [25]. Coal fly ash contains a certain amount of metal oxides which will inevitably be released to the environment if it is not converted into useful materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of MCM-41 from coal fly ash by a green approach: Influence of synthesis pH

Hui

Chao

2006

Journal of Hazardous Materials

129

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“…2), 3) Near ly 500 million metric tons of fly ash are produced annually in the world, with the global recycling rate being only 15%. 4) The applications at present are as a fine aggregate to sub stitute for portland cement in concrete, as deposits in lan dfills and/or coal mines or sea-side docking areas, and as lin ing for hazardous waste dumps. Since the major chemical compounds contained in fly ash are SiO2 and Al2O3 (60-70 mass% and 16-20mass%, respectively), resource recovery is one of the most important issues of waste management at present.…”

Section: Introductionmentioning

confidence: 99%

“…These treat ed fly ash materials (zeolites) with relatively high cation ex change capacity (CEC) were used to evaluate in practical application in removing heavy metals or ammonia from wastewaters. 1), 4) Conventionally coal fly ash has been converted to zeolite by alkaline hydrothermal treatment, which is analogous to the formation of natural zeolite from volcanic deposits. Several groups around the world have studied the conver sion of fly ash into zeolite.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Catalytic Activities of Faujasites Synthesized by Using Coal Fly Ash.

Kumar

Oumi

Sano

et al. 2001

J. Ceram. Soc. Japan

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Coal combustion by-product fly ash was converted selectively into faujasite (Y type) zeolite and was used as a catalytic material. The conversion process tried to alleviate the disposal problem of large amounts of fly ash, and turned fly ash into useful materials. Fused fly ash powder and supernatant were used in the synthe sis of Y type zeolite. The prepared Na-Y zeolites were characterized and ion-exchanged followed by calcina tions to obtain H-Y. The catalytic properties of the solid obtained were evaluated using cumene cracking and compared with those of commercially available (standard) zeolites. It was found that most of the Si and Al components in the fly ash could be effectively transformed into Y type zeolite in the presence of seeds but not the mineral phase, such as mullite. Moreover, the supernatant of the fused powder solution can produce purer faujasites and the sediment can be reused to generate solution for the further preparation of zeolites. Investigation by NMR demonstrated that fusion plays an important role in enhancing the hydrothermal con ditions for zeolite synthesis. The H-Y zeolite derived from the supernatant of fly ash solution shows excel lent cracking activity compared to that of standard.

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Crystallization of K–L and K–W zeolites from fly-ash

Cited by 36 publications

References 21 publications

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Synthesis of MCM-41 from coal fly ash by a green approach: Influence of synthesis pH

Characterization and Catalytic Activities of Faujasites Synthesized by Using Coal Fly Ash.

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