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

Hu, Tao, Dalian University of Technology
Gao, Wenyan, Dalian University of Technology
Liu, Xin, Dalian University of Technology
Zhang, Yifu, Dalian University of Technology
Meng, Changgong, Dalian University of Technology
Published Sep 21, 2017 on Dryad. https://doi.org/10.5061/dryad.s145h

Cite this dataset

Hu, Tao et al. (2017). Data from: Synthesis of zeolites Na-A and Na-X from tablet compressed and calcinated coal fly ash [Dataset]. Dryad. https://doi.org/10.5061/dryad.s145h

Abstract

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.

Usage notes

RSOS-170921

This zip file contains all the original data described in "Synthesis of Zeolites Na-A and Na-X from Tablet Compressed and Calcinated Coal Fly Ash" to be published in Royal Society Open Science (Manuscript ID: RSOS-170921). It contains totally 11 files. Figure1.txt The original data for Figure 1, XRD patterns of the raw CFA sample (a) and the Na2CO3 and CFA mixture after calcination. Figure2.txt The original data for Figure 2, the effect of Na2CO3/CFA mass ratio on the structure of the products. Figure3.txt The original data for Figure 3, the impact of crystallization temperature on the structure of the products. Figure4.txt The original data for Figure 4, the impact of SiO2/Al2O3 molar ratio on the structure of the hydrothermal reaction products at 100 oC for 8 h with additional silica sol and sodium hydroxide. Figure5.txt The original data for Figure 5, the effect of Na2CO3/CFA mass ratio on the structure of the products. Figure6.txt The original data for Figure 6, FT-IR spectra of Na-A and Na-X samples. Figure7a.txt The original data for Figure 7a, TGA of Na-A sample. Figure7b.txt The original data for Figure 7b, TGA of Na-X sample. Figure1ai.tif The SEM image of raw coal fly ash. Figure8a.tif The SEM image of zeolite Na-A synthesized from tablet-compressed and calcinated coal fly ash. Figure8b.tif The SEM image of zeolite Na-X synthesized from tablet-compressed and calcinated coal fly ash.