Naslov
Kinetic study of LiAlSiO4 formation from Li-exchanged zeolite A by time-resolved sinchrotron powder diffraction

Autori
Kosanović, Cleo ; Norby, Poul ; Subotić, Boris

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 14-th International Zeolite Conference, Recent Advances in the Science and Technology of Zeolites and Related Materials, Studies in Surface Science and Catalysis, Vol. 154 / Van Steen, Eric. ; Callanan, Linda ; Claeys, Milton. - Amsterdam : Elsevier, 2004, 1431-1438

Skup
14-th International Zeolite Conference

Mjesto i datum
Cape Town, Južnoafrička Republika, 25.04.2004. - 30.04.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Non-isothermal transformation; Li-exchanged zeolite A; Amorphous aluminosilicate; β -eucryptite; Mechanism; Kinetics

Sažetak
Thermal transformation of |Li|-LTA was followed by in situ, time-resolved synchrotron X-ray powder diffraction. The powder diffraction experiment was carried out in non-isothermal mode, using transmission geometry with capillary sample and an imaging plate detector. The |Li|-LTA was heated linearly, from 30 oC to 1000 oC, using different heating rates. Most amount of the |Li|-LTA was transformed into an amorphous aluminosilicate phase at about 820 oC. At about 790 oC, a new crystalline phase of β -eucryptite was started to crystallize from the amorphous phase. Kinetics of non-isothermal amorphization of |Li|-LTA and crystallization of β -eucryptite are analyzed by the changes of the rate constants during heating. Apparent activation energies of the amorphization of |Li|-LTA and crystallization of β -eucryptite are determined and kinetic equations for the mentioned processes are derived.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA