Synthesis of ZSM-5 from impure and beneficiated Grahamstown kaolin: Effect of kaolinite content, crystallisation temperatures and time

Mohiuddin, Ebrahim; Isa, Yusuf Makarfi; Mdleleni, Masikana M.; Sincadu, N.P.; Key, David L.; Tshabalala, Themba E.

doi:10.1016/j.clay.2015.10.008

Cited by 55 publications

(24 citation statements)

References 32 publications

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“…Dealumination process was carried out with a mixture of HCl 2 M and metakaolin in ratio 1:5 (Pan et al, 2014). During the dealumination process alumina extracted from the metakaolin's framework, so the mole ratio of Si/Al increased (Mohiuddin et al, 2016). The results of XRF analysis were summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

Hartati

Sakti

Firda

et al. 2019

Valensi

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Synthesis of Na-X zeolite was conducted from kaolin and metakaolin. Synthesis varied in its pretreatment method and hydrothermal conditions. The pretreatment methods used were: conventional alkaline, alkaline fusion and conventional fluoride. Hydrothermal conditions for the experiments were gradual temperature 40 o C (6h), 60 o C (6h), 80 o C (12h), and constant temperature 80 o C for 24 h, 100 o C for 24 and 100 o C for 48 h. Synthesized products were characterized by X-Ray Diffraction (XRD), Fourier Transform InfraRed (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), and N 2 Isotherm Adsorption/Desorption method. The result showed that pre-treatment by conventional fluoride could not produce Na-X zeolite, synthesis by conventional alkaline and alkaline fusion with hydrothermal at 100 o C (48h), 100 o C (24 h), and gradual temperature produce Na-X zeolite with Na-P1 or Na-A zeolite as impurities, while synthesis from metakaolin by conventional alkaline with hydrothermal at 80 o C for 24 hours produced pure Na-X zeolite. Na-X zeolite and Na-P1 zeolite with hierarchical pores were synthesized through alkali fusion with hydrothermal at 100 o C for 24 hours.

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Section: Resultsmentioning

confidence: 99%

Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

Hartati

Sakti

Firda

et al. 2019

Valensi

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“…ZSM‐5 was synthesized according to a procedure developed by Mohiuddin et al . Kaolin (Sigma‐Aldrich) was first calcined at 750 °C for 2 h at the rate of 5–8 °C min −1 in a Thermo Scientific Thermolyne furnace in order to achieve a meta‐kaolin phase.…”

Section: Methodsmentioning

confidence: 99%

CO₂ Capture from Air Using Amine‐Functionalized Kaolin‐Based Zeolites

et al. 2017

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Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthdaySeveral inexpensive zeolites such as ZSM-5 (MFI), zeolite Y (FAU), and SAPO-34 (CHA) were developed from kaolin clay and applied for CO 2 capture from air. These molecular sieves were functionalized with tetraethylenepentamine (TEPA) in order to further improve their CO 2 capacity. The obtained kaolin-based zeolites exhibited similar properties than those of zeolites prepared with other sources. They also revealed a bimodal pore network consisting of both micropores and mesopores. The effect of amine loading on CO 2 capture was investigated and the results demonstrated that TEPA-modified zeolite Y with 10 wt % TEPA had a higher capacity than other zeolites due to its larger mesopore volume. The presence of mesopores in the zeolite Y framework facilitated a better accessibility of CO 2 molecules to the amine sites.

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“…As observed, NaA is the most important zeolite phase can be formed in short crystallization times as it was formed in the second run (S 2 ) of the Plackett-Burman based experiments (table 3) [37]. Formation/dissolving of different zeolite phases can occur over the zeolite synthesis time then for obtaining the desired zeolite phase with proper crystallinity, crystallization time should be adjusted in it's relevant optimum value [43,44]. Also, this zeolite synthesis is favored by low synthesis temperatures as it observed in sample S 5 .…”

Section: The Synthesis Timementioning

confidence: 95%

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Pourazar¹,

Mohammadi²,

Nasr³

et al. 2020

Mater. Res. Express

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The Plackett-Burman method was used to identify and rank most affective parameters on hydrothermal synthesis and properties of the 13X zeolite powder with gel composition of Al 2 O 3 :aSiO 2 :bNa 2 O:cH 2 O. The affective parameters of SiO 2 /Al 2 O 3 ratio, synthesis mixture alkalinity, synthesis temperature, and water content were selected for further study of their impacts and gel composition optimization using the Taguchi method. The synthesized powders were characterized by XRD and SEM analysis. Synthesis temperature and mixture alkalinity were found as the most affecting parameters on the 13X zeolite synthesis at the best gel composition of Al 2 O 3 :5.4SiO 2 : 13Na 2 O: 840H 2 O. Then 13X zeolite membranes were synthesized on the seeded supports using the optimum gel composition and impacts of synthesis temperature and time and coating layer number on their H 2 and CO 2 permeances and ideal H 2 /CO 2 selectivity were studied. The optimum 13X zeolite membrane for H 2 /CO 2 separation was obtained by three layer coatings at 80°C for 16 h with H 2 permeance of 2.88 cm 3 cm −2 .Pa.s and ideal H 2 /CO 2 selectivity of 4.72.

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Synthesis of ZSM-5 from impure and beneficiated Grahamstown kaolin: Effect of kaolinite content, crystallisation temperatures and time

Cited by 55 publications

References 32 publications

Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

CO₂ Capture from Air Using Amine‐Functionalized Kaolin‐Based Zeolites

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

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Synthesis of ZSM-5 from impure and beneficiated Grahamstown kaolin: Effect of kaolinite content, crystallisation temperatures and time

Cited by 55 publications

References 32 publications

Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin

CO2 Capture from Air Using Amine‐Functionalized Kaolin‐Based Zeolites

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

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Product

Resources

About

CO₂ Capture from Air Using Amine‐Functionalized Kaolin‐Based Zeolites