The adsorption of SO{sub 2} by zeolites synthesized from fly ash
- Pennsylvania State Univ., University Park, PA (United States). Materials Research Lab.
Zeolites X, Y, and Na-Pl (90 C) and analcime and sodalite (150 C) were synthesized from Class F fly ash using 3 M sodium hydroxide solutions and autogenous pressures. The partially zeolitized fly ashes were dried overnight in air at room temperature and then characterized using X-ray diffraction and SEM. On occasion, a few samples were dried to constant weight for an additional 8--10 min in a microwave oven to remove bound water as well. The dried samples were evaluated for their ability to adsorb sulfur dioxide (SO{sub 2}) from a simulated stack gas containing {approximately}1000 ppm SO{sub 2}. Determinations were made in real time using a UV/vis spectrophotometer followed by a total sulfur analysis of the loaded samples once testing was complete. Breakthrough curves indicate that the zeolites in the samples are able to remove all of the SO{sub 2} in the simulated flue gas (zero SO{sub 2} emission) for varying periods of time, and that the actual amount of SO{sub 2} removed by the zeolite depended on the type and degree of dryness of the zeolite or zeolite-like material present. For example, a 7 day 150 C cured sample containing analcime and dodalite was able to adsorb 6--7 mg of SO{sub 2} per gram of sample regardless of the source of the fly ash, whereas a 90 C cured sample containing X, Y, and Na-P1 was significantly less efficient.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 354350
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 9 Vol. 33; ISSN ESTHAG; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
Similar Records
SO2 REMOVAL FROM FLUE GASES USING UTILITY SYNTHESIZED ZEOLITES
Bulk modulus of basic sodalite, Na{sub 8}[AlSiO{sub 4}]{sub 6}(OH){sub 2}.2H{sub 2}O, a possible zeolitic precursor in coal-fly-ash-based geopolymers