Thermal stability of Ag-exchanged clinoptilolite rich mineral
Thermal stability of clinoptilolite rich mineral from Western Anatolia, Turkey and its Ag-exchange forms was investigated. Parent mineral of different sizes were heated up to 1000°C with heating rate of 2 and 10°C min-1 using differential thermal analyzer (DTA) and thermogravimetric analyzer (TG). Ag exchange was conducted both in conventional constant temperature waterbath and microwave at 40, 60 and 80°C. The exchanged minerals were then characteized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), DTA and TG.
The particle size and heating rate do not have significant effect on the thermal behavior of the parent mineral and no structural changes were observed with Ag exchange, only decomposition temperature was lowered. It was finally concluded that, Ag-exchanged clinoptilolite rich minerals were less thermally stable compared to parent mineral that does not affect their use for possible applications.
KeywordsAg-clinoptilolite heating rate microwave particle size thermal stability
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- 1.F. Ç. Özkan and S. Ülkü, Ambalaj Kongresi ve Yan Sanayi Kongresi ve Sergisi Izmir, (1997) 227.Google Scholar
- 6.D. W. Breck, Zeolite Molecular Sieve; Structure, Chemistry and Use, John Wiley and Sons, New York 1974.Google Scholar
- 11.D. Misshra, Stud. Surf. Sci. Catal., 154 (2004).Google Scholar
- 12.M. Afzal, G. Yasmeen, M. Saleem, P. K. Butt, A. K. Khattak and J. Afzalı, J. Therm. Anal. Cal., 62 (2000) 72.Google Scholar
- 15.A. Arcoya, J. A. Gonzalez, N. Travieso and X. L. Ve Seona, Miner. Soc., 29 (1993) 123.Google Scholar
- 16.Ö. Çağlar Duvarcı, Y. Akdeniz, F. Özmıhçı, S. Ülkü, D. Balköse and M. Çiftçioğlu, Ceram. Int., 33 (2006) 795.Google Scholar
- 20.R.-M. Woods and M. E. Gunter, Am. Mineral., 86 (2001) 424.Google Scholar