Influence of aluminium source on the crystal structure and framework coordination of Al and Si in fly ash-based zeolite NaA

Ameh, Alechine E.; Fatoba, Ojo O.; Musyoka, Nicholas M.; Petrik, Leslie

doi:10.1016/j.powtec.2016.11.003

Cited by 52 publications

(19 citation statements)

References 25 publications

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“…We then characterized the chemical composition of synthesized Na-A and Na-X samples with XRF. The result of XRF on Na-A sample indicates that it contains 44.64% SiO 2 , 37.29% Al 2 O 3 , 18.22% Na 2 O, 3.80% CaO, 3.36% Fe 2 O 3 , 3.06% TiO 2 , 0.55% MgO and 0.41% K 2 O and the corresponding Si/Al molar ratio is 1.48 and is typical for commercial Na-A, while that for the Na-X sample is 5.12 [ 30 , 61 , 62 ]. The high Si/Al molar ratio of Na-X is due to the introduction of silica sol to get phase-pure Na-X [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Hu¹,

Gao²,

Liu³

et al. 2017

R. Soc. open sci.

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Zeolites Na-A and Na-X are important synthetic zeolites widely used for separation and adsorption in industry. It is of great significance to develop energy-efficient routines that can synthesize zeolites Na-A and Na-X from low-cost raw materials. Coal fly ash (CFA) is the major residue from the combustion of coal and biomass containing more than 85% SiO2 and Al2O3, which can readily replace the conventionally used sodium silicate and aluminate for zeolite synthesis. We used Na2CO3 to replace the expensive NaOH used for the calcination of CFA and showed that tablet compression can enhance the contact with Na2CO3 for the activation of CFA through calcination for the synthesis of zeolites Na-A and Na-X under mild conditions. We optimized the control variables for zeolite synthesis and showed that phase-pure zeolite Na-A can be synthesized with CFA at reactant molar ratio, hydrothermal reaction temperature and reaction time of 1.3Na2O: 0.6Al2O3: 1SiO2: 38H2O at 80°C for 6 h, respectively, while phase-pure zeolite Na-X can be synthesized at 2.2Na2O: 0.2Al2O3: 1SiO2: 88H2O at 100°C for 8 h, respectively. The composition, morphology, specific surface area, vibration spectrum and thermogravimetry of synthesized Na-A and Na-X were further characterized.

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Section: Resultsmentioning

confidence: 99%

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Hu¹,

Gao²,

Liu³

et al. 2017

R. Soc. open sci.

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“…Interestingly, this suggested that as the band width of Q 3 Si (1Al) was enhanced and the area of Q 4 Si (0Al) decreased the relative crystallinity of HBEA zeolite increased. Ameh et al [14] related that the reducing band area of Q 4 Si (0Al) correlated with the relative crystal growth of the zeolite. Hence, the NMR signal of the synthesised CFA based HBEA zeolites related mainly to Q 3 Si (1Al) and Q 4 Si (0Al) without the formation of terminal Si-OH group of structural defects.…”

Section: 4mentioning

confidence: 99%

“…The production of zeolites from CFA via hydrothermal process has been reported mostly for condensed structures low Si/Al zeolites [9,12]. For example, LTA [13,14], FAU (X) [13,15], GIS (P), CAN [16,17], LTL, SOD [11,18] and ANA [19,20] zeolites.…”

Section: Introductionmentioning

confidence: 99%

Transformation of fly ash based nanosilica extract to BEA zeolite and its durability in hot liquid

Ameh

Fatoba

Musyoka

et al. 2020

Microporous and Mesoporous Materials

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Various natural products such as clay and waste by-products (Ma et al, 2014;Maia et al, 2015), including siliceous minerals (Liu et al, 2015), biomass of plant ash residues (Belviso, 2018), electronic waste (Mallapur and Oubagaranadin, 2017), and coal fly ash (CFA) (Ameh et al, 2017;Ameh et al, 2020a), have been used as feedstock for the synthesis of zeolites.…”

Section: Introductionmentioning

confidence: 99%

“…The advantage of CFA is based on its negligible cost, abundance, availability, and the suitable content of silica and alumina that allows its complete conversion into zeolites (Wdowin et al, 2014). Likewise, the framework structure of typical zeolites consists of aluminosilicate building blocks (Martinez Sanchez and Pérez Pariente, 2011), which are similar to the silica and aluminum components in CFA (Musyoka et al, 2011;Boycheva et al, 2013;Ameh et al, 2017). Interestingly, Ameh et al (2020a) and Petrik et al (2020) have demonstrated that CFA can act as an inexpensive and recyclable feedstock for the production of pure BEA zeolite phase via an indirect hydrothermal route.…”

Section: Introductionmentioning

confidence: 99%

Acylation of Anisole With Benzoyl Chloride Over Rapidly Synthesized Fly Ash–Based HBEA Zeolite

et al. 2021

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Stable HBEA zeolite with high surface area and strong acid sites was synthesized from coal fly ash–based silica extract via indirect hydrothermal synthesis. The rapid HBEA hydrothermal crystallization times of 8, 10, and 12 h were achieved through a reduced molar water fraction in the synthesis composition. The HBEA zeolites prepared from fly ash silica extract exhibited well-defined spheroidal-shaped crystal morphology with uniform particle sizes of 192, 190, or 239 nm obtained after 8, 10, or 12 h of synthesis time, respectively. The high surface area and the microporous area of 702 and 722 m2/g were achieved as a function of shorter hydrothermal synthesis durations (10 and 24 h, respectively) compared to 48 or 72 h, which resulted in HBEA zeolites with lower surface areas of 538 and 670 m2/g. Likewise, temperature-programmed desorption measurements of fly ash–based HBEA zeolites revealed the presence of weak and strong acid sites in the zeolite. The submicron crystal sizes with a well-defined porosity of HBEA zeolites enhanced the diffusion of anisole and benzoyl chloride molecules toward the active acid sites and hence showed better conversion and selectivity in acylation products. High conversion of benzoyl chloride with anisole was achieved, reaching up to 83% with a 93–96% selectivity toward 4-methoxyacetophenone.

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Influence of aluminium source on the crystal structure and framework coordination of Al and Si in fly ash-based zeolite NaA

Cited by 52 publications

References 25 publications

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash

Transformation of fly ash based nanosilica extract to BEA zeolite and its durability in hot liquid

Acylation of Anisole With Benzoyl Chloride Over Rapidly Synthesized Fly Ash–Based HBEA Zeolite

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