Zeolite Formation from Coal Fly Ash and Its Adsorption Potential

Ruen-ngam, Duangkamol; Rungsuk, Doungmanee; Apiratikul, Ronbanchob; Pavasant, Prasert

doi:10.3155/1047-3289.59.10.1140

Cited by 35 publications

(13 citation statements)

References 16 publications

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“…In order to measure the concentration of leached ions from the tested samples, the supernatant solution of the CEC tests was analyzed by an inductively coupled plasma atomic emission spectrometer (ICP‐AES; Varian, Australia) with ICP expert software v 4.0. The product yield of the zeolitization process demonstrating the efficiency of the zeolite synthesis procedure was calculated by 13: …”

Section: Methodsmentioning

confidence: 99%

“…The first one is a two‐step process, in which pretreatment fusion at high temperature is followed by a hydrothermal process. Different zeolites including Na‐A 7–9, Na‐X 10–14, and Na‐P 15 were synthesized by means of this indirect two‐stage method. The second method is a direct hydrothermal process, in which the fusion step is eliminated 16 and different zeolites such as Na‐A 17, 18, Na‐Y 19, Na‐P 20–23, and hydroxy sodalite 24 are synthesized.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using Coal Fly Ash and Wastewater for Microwave Synthesis of LTA Zeolite

Behin¹,

Bukhari²,

Dehnavi³

et al. 2014

Chem Eng & Technol

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The reuse of industrial wastes from a coal-fired power plant and a plasma electrolytic oxidation process was attempted to realize a zero discharge. The batch composition was adjusted by adding sodium hydroxide and sodium aluminate. A single-mode microwave oven equipped with reflux condenser was used for crystallization under atmospheric pressure. The synthesized samples were characterized by X-ray diffraction, scanning electron microscopy, BET, thermogravimetric analysis, and cation-exchange capacity (CEC) measurement. Analytical results indicated that Na-A zeolite with a defined maximum crystallinity could be successfully synthesized by hydrothermal treatment of fly ash with wastewater. Due to the high CEC, the product can be applied for gas purification and soil remediation processes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using Coal Fly Ash and Wastewater for Microwave Synthesis of LTA Zeolite

Behin¹,

Bukhari²,

Dehnavi³

et al. 2014

Chem Eng & Technol

View full text Add to dashboard Cite

show abstract

“…For instance, zeolite production by the fusion method is efficient, but the process is complicated and energy-demanding; the dry conversion allows a reduction of waste generated in the process, but synthesized zeolites display properties that significantly limit their utilization. The cost of hydrothermally synthesized zeolites on half-industrial scale was estimated to be between $40-96/kg 8,9 . In the case of two-step synthesis, the cost would be similar.…”

mentioning

confidence: 99%

CO2 sorption and regeneration properties of fly ash zeolites synthesized with the use of differentiated methods

Czuma

Casanova

Baran

et al. 2020

Sci Rep

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Production of fly ash zeolites may be an attractive method for the utilization of solid wastes from the energy sector. Different methods of synthesis often yield a variety of zeolite types, thereby affecting the properties of the resulting materials. The attention paid to carbon dioxide emission reduction technologies fully justifies the study of the sorption behaviours of fly ash zeolites synthesized by different methods. This work investigates the sorption properties of fly ash zeolites synthesized with different methods using CO 2. Sorption capacity and adsorption isotherms were determined following the volumetric method and textural parameters were resolved according to the Dubinin-Astakhov (DA) method. The CO 2 sorption capacity was in the range 0.24-4.16 mmol/g. The relationships between structure and sorption behaviour were studied for each synthesis method. Some strong similarities between commercial zeolites and fly ash zeolites were found. The mechanism for sorption was proved to be physisorption which is fully reversible under selected conditions. The observed trends were used to identify the best sorbent. It is believed that increasing the amount of CO 2 caused by anthropogenic emission (recently observed to exceed the 400 ppm) is leading to global climate change. Currently, many political and ecological actions are aimed at limiting CO 2 emissions into the atmosphere. Difficulty avoiding emissions in many sectors fully justifies the efforts made to capture carbon dioxide. The most common method is based on the utilization of liquid amines for the removal of CO 2 from flue gases. However, this process has some drawbacks due to amine degradation leading to low CO 2 capture efficiency, high regeneration energy requirements and corrosive effects on separation equipment units 1. Therefore, exploration of differentiated materials for CO 2 capture is needed. One possibility is the use of technologies based on adsorption processes. Adsorbents need to be cost-effective (low cost raw material), have low heat capacity, fast kinetics, high CO 2 adsorption capacity and selectivity, and thermal, chemical and mechanical stability under extensive cycling 2. The most interesting adsorbents include activated carbons, zeolites and MOFs. MOFs are currently of great importance for CO 2 capture as they have high microporosity, unlimited chemical adjustability and surface functionality compared to conventional porous zeolites and activated carbon. Although these adsorbents work well in CCS technologies, they may not be sufficient in post-combustion processes due to very high temperatures. Additionally, MOFs are extremely expensive relative to zeolites and activated carbon; the price is estimated to be approximately $130-200/kg 3. Activated carbon is one of the most widely used solid adsorbents for the capture of CO 2. This is due to its microporous character, adequate pore size distribution, low cost and easy regeneration. However, activated carbon CO 2 /N 2 selectivity is relatively low. For the purpose of adjusting the p...

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“…Materiał zeolitowy (bogaty w fazę Na-X) dzięki obecnym mikroporom oraz ich dużej objętości jak również wysokiej termostabilności może być użyty na potrzeby oczyszczania wód i ścieków z metali ciężkich [13], remediacji gruntów [16], uwiązywania 137 Cs [8], jak również jako adsorbent gazów przemysłowych SO 2 , CO 2 i NH 3 [17][18][19].…”

Section: Potencjalne Aplikacje Otrzymanych Materiałów Zeolitowychunclassified

X type zeolitic materials synthesized from fly ash using hydrothermal and low-temperature methods

Franus

2010

Bud-Arch

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This study presents the results of experiments dealing with the possibility of transforming F class fly ash into a zeolitic material. Two types of synthesis methods were used in the research: hydrothermal and low-temperature synthesis. As a result of alkaline reaction of fly ash with NaOH, all experimental cases yielded zeolitic material which is rich in Na-X phase. The mineralogical composition as well as the physico-chemical properties in Na-X phase was obtained. The mineralogical composition as well as the physico-chemical properties of the obtained material are explored and the feasibility of practical application is shown.

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Zeolite Formation from Coal Fly Ash and Its Adsorption Potential

Cited by 35 publications

References 16 publications

Using Coal Fly Ash and Wastewater for Microwave Synthesis of LTA Zeolite

Using Coal Fly Ash and Wastewater for Microwave Synthesis of LTA Zeolite

CO2 sorption and regeneration properties of fly ash zeolites synthesized with the use of differentiated methods

X type zeolitic materials synthesized from fly ash using hydrothermal and low-temperature methods

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