Journal
JOURNAL OF CRYSTAL GROWTH
Volume 528, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jcrysgro.2019.125286
Keywords
Self-supporting; Hierarchical structure; Solvent-free; 4A zeolite; Metakaolin
Funding
- National Key R&D Program of China [2017YFB0310805]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [26420190057]
- Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences (Wuhan) [NGM2019KF016]
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A series of novel self-supporting hierarchically porous zeolite monoliths with micropores and macropores were successfully prepared using polymethyl methacrylate (PMMA) microbeads as sacrificial template via solvent-free strategy. The effects of several synthesis parameters, such as Na/Al molar ratio, H2O/metakaolin (MK) mass ratio, MK/PMMA mass ratio and curing time on the structure and morphology of hierarchical zeolite monoliths were systematically investigated. Multiple techniques, including SEM, XRD, FTIR, XRF, BET, MIP and TG-DTG were used to test the properties of resultant products. The experimental results show that hierarchical 4A zeolite monoliths could be obtained at Na/Al molar ratio of 1.2:1, H2O/MK mass ratio of 1.1:1, MK/PMMA mass ratio of 50/50, curing temperature of 70 degrees C for 24 h and calcination temperature of 550 degrees C for 2 h. The SiO2/Al2O3 molar ratio and BET specific surface area were found to be 1.92 and 57.67 m(2)/g, respectively. The diameter of macropore pores were mainly in the range of 840-4130 nm.
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