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

Thuadaij, Pattaranun; Nuntiya, Apinon

doi:10.2306/scienceasia1513-1874.2012.38.295

Cited by 16 publications

(12 citation statements)

References 26 publications

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“…4 has demonstrated XRD patterns for RHACI and RHATU-SO4H which stated a broad diffraction band at 2θ angle of about 22°. These results are typically corresponding with XRD patterns of amorphous silica of RHACI and RHATU-SO4H [21]. …”

Section: Introductionsupporting

confidence: 65%

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Mihsen¹,

Sobh²

2018

Asian J. Chem.

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Sodium silicate was prepared from rice husk ash (RHA), which then functionalized with 3-(chloropropyl)triethoxysilane via simple solgel technique to form RHACCl. The chloro group in RHACCl was replaced in iodo group to form RHACI. Thiourea was immobilized on RHACI to synthesize nanoheterogeneous catalyst labeled as RHATU-SO4H. The FT-IR analysis clearly indicated the presence of primary amine -NH2 and C-N absorption band. BET surface area measurement also showed that the surface area is 357 m 2 /g of catalyst with pore size distribution (2-20 nm) which falls within the mesoporous region. The elemental analysis has also proved the existence of nitrogen and sulfur in the structure of the catalyst. Upon application of RHATU-SO4H as a catalyst, the degradation of cellulose to glucose yields 81 % at 140 °C for 16 h. The synthesized catalyst is easy to synthesize, highly stable throughout hydrolysis of cellulose as well as reusability without loss of catalyst activity.Keywords: Rice husk ash, Thiourea, Hydrolysis of cellulose, Glucose.Asian Journal of Chemistry; Vol. 30, No. 5 (2018), 937-943 acid and ionic liquid [10]. Microorganism in nature is wellknown in the oroduction of soluble sugar, primarily cellobiose and glucose [11]. EXPERIMENTALSodium hydroxide (BHD, England 99%), nitric acid (CDH, India 70 %), 3-chloropropyltriethoxysilane (Sigma, Garmin 99 %), thiourea (Sigma, Germany 99%), toluene (GCC, England 98 %), DMSO (GCC, England 97 %), triethylamine (CDH, India 98 %), ethanol absolute (99 %), methanol (99 %), DMF (LOBA, Cheme 99.8%). All the chemicals used were of AR grade or a high purity and used directly without further purification.Extraction and modification of silica from RHA Source of silica: The RHA was chosen as an amorphous silica source, it is available in the profusion. The silica was extracted from rice husk as described in the literature [12,13].Functionalization of RHA with CPTES: According to the procedure described in the reference [14], 3 g of RHA was placed in 200 mL of 2 M NaOH in a plastic container at 75 °C for 60 min. The produced sodium silicate was filtered to get rid of the undissolived particles. A 6.0 mL solution of CPTES was added to the prepared sodium silicate solution. This solution was added dropwise (1.0 mL/min) to 3.0 M of nitric acid with constant stirred. The difference in pH was observed by using pH meter. A white gel started to form when

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Section: Introductionsupporting

confidence: 65%

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Mihsen¹,

Sobh²

2018

Asian J. Chem.

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“… 32 Furthermore, Al–O–Si symmetrical vibrations shifted from 772 cm –1 and appeared more pronounced at 699 cm –1 for the synthesized sodalite and zeolite A. 33 The vibrational peaks were displaced to a lower wavenumber compared to coal fly ash and new peaks were formed during zeolitization.…”

Section: Results and Discussionmentioning

confidence: 95%

Microwave Irradiation-Assisted Synthesis of Zeolites from Coal Fly Ash: An Optimization Study for a Sustainable and Efficient Production Process

et al. 2020

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Class F South African coal fly ash was used as a precursor for the synthesis of zeolite A via complete microwave irradiation. To attain optimal conditions for the synthesis of zeolite A with minimum impurities, the microwave synthesis time, irradiation power, and Si/Al ratio were varied. Sodalite with fly ash phases were obtained when the Si/Al ratio in the coal fly ash was not adjusted and when the microwave irradiated coal fly ash slurry was used instead of the extract solution. Increased microwave irradiation time power and time favored the crystallization of zeolite A phase due to sufficient energy needed to ensure the dissolution of Al and Si from coal fly ash. A Brunauer–Emmett–Teller surface area of 29.54 m 2 /g and a cation exchange capacity of 3.10 mequiv/g were achieved for zeolite A, suggesting its potential application as an adsorbent and cation exchange material for environmental remediation. Complete microwave irradiation offers a greener approach toward zeolite synthesis from coal fly ash compared to conventional hydrothermal and fusion methods that consume a lot of energy and require longer reaction times.

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“…The second component in terms of content was Al 2 O 3 , which occurred in the amount of 21.44% in sample K1 and 27.37% in K2. Measured contents of said compounds, as well as their mutual ratio, which were almost three times greater than SiO 2 to Al 2 O 3 , indicated the potential usefulness of this type of materials as a raw material for the synthesis of zeolites [44].…”

Section: Resultsmentioning

confidence: 99%

Calcined Post-Production Waste as Materials Suitable for the Hydrothermal Synthesis of Zeolites

Łach

Grela

Komar³

et al. 2019

Materials

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The zeolite production process is currently being very intensively researched. Due to environmental protection, as well as issues related to the guidelines of a zero-waste economy, all activities aimed at obtaining such materials from post-processed waste are extremely important. This article presents an innovative method of utilising calcined carboniferous shale in order to produce synthetic zeolites. The raw material for testing came from two Polish hard coal mines. Both the chemical and phase composition of the coal shale were characterised. Based on the recorded thermal analysis results coupled with the mass spectrometer, the processes occurring during the heating of raw materials were interpreted and the calcination temperatures were determined. The changes in the phase composition of raw materials resulting from the calcination process used were also analysed. The heat-treated raw materials were subjected to the synthesis of zeolites in an aqueous solution of sodium hydroxide by means of the hydrothermal method at a concentration of 2.75 M. The results of water leaching and structural parameters are presented for both raw materials, as well as the produced synthesis. The conducted research confirmed that after the application of the synthetic process on coal shale, a zeolite with a surface area of SBET equal to 172 m2/g can be obtained.

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

Cited by 16 publications

References 26 publications

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Preparation and Characterization of Thiourea-Silica Hybrid as Heterogeneous Catalyst

Microwave Irradiation-Assisted Synthesis of Zeolites from Coal Fly Ash: An Optimization Study for a Sustainable and Efficient Production Process

Calcined Post-Production Waste as Materials Suitable for the Hydrothermal Synthesis of Zeolites

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