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Korean Journal of Metals and Materials > Volume 55(2); 2017 > Article
Korean Journal of Metals and Materials 2017;55(2): 144-149. doi: https://doi.org/10.3365/KJMM.2017.55.2.144
세륨 인산염계 유리에서 세륨의 산화수와 촉매특성에 대한 용융조건의 영향
김주형, 김대성, 류봉기
부산대학교 재료공학과
Effects of Melting Conditions on Cerium oxidation state and Catalytic Behavior on Cerium Phosphate Glasses
Ju-Hyeong Kim, Dae-Sung Kim, Bong-Ki Ryu
Department of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
Correspondence  Bong-Ki Ryu ,Tel: +82-51-510-3200, Email: bkryu@pusan.ac.kr
Received: 10 June 2016;  Accepted: 23 August 2016.  Published online: 2 February 2017.
ABSTRACT
As with any solvent, stabilizing a multivalent element at a given oxidation level in the glass depends on the thermodynamic conditions. The effects of temperature in the oxidation-reduction equilibrium have been previously noted with higher temperatures being conductive to reduced states. 30Ce2O-70P2O5 binary system glasses were prepared. The effects of melting temperature and time on Ce4+ and Ce3+ ion concentration were studied with X-ray photoelectron spectroscopy (XPS). Different melting conditions were investigated at temperatures ranging from 1300 to 1500 ℃ for 60 min, and 1400 ℃ for from 30 min to 90 min. Changes in the catalytic properties of the glasses as a function of Ce4+ and Ce3+ ion concentration were confirmed based on the changes in decomposition starting temperatures using thermogravimetric analysis (TGA). The main changes in the valence states in relation to melting conditions are discussed in terms of the catalytic properties on cerium phosphate glasses.
Keywords: glasses, melting condition, Ce oxidation state, catalytic property
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