Effect of P2O5 Addition on the Rate of CO2 Dissociation on the Surface of FetO-base Molten Oxides

• Matsuura Hiroyuki

  Graduate School of Frontier Sciences, the University of Tokyo

• Ishida Ikutora

  Student, Graduate School of Engineering, the University of Tokyo.

• Tsukihashi Fumitaka

  Graduate School of Frontier Sciences, the University of Tokyo

Abstract

For clarification of the surface active effect of P₂O₅ in the reaction kinetics and mechanism of the various metallurgical processes, the effect of P₂O₅ addition on the reaction rate of CO₂ dissociation on the surface of the Fe_tO, Fe_tO-CaO (mol%Fe_tO : mol%CaO=6 : 4), Fe_tO-SiO₂ (mol%Fe_tO : mol%SiO₂=7 : 3), and Fe_tO-CaO-SiO₂ (mol%Fe_tO=35, mol%CaO/mol%SiO₂=1.13-1.27 and 1.36-1.47) melts was investigated at 1773 K with P_CO₂/P_CO=1 by using isotope exchange technique. The rate constant decreased with increasing P₂O₅ content of melts and the residual rate constant was observed at high P₂O₅ content. However, the change of the Fe³⁺/Fe²⁺ ratio of molten oxide was not observed. Results were analyzed by using “site blockage model” of P₂O₅, and it was concluded that the rate controlling step of CO₂ dissociation was the dissociation reaction of adsorbed CO₂ molecule on the surface of molten oxides.

Journal

• ISIJ International

  ISIJ International 44 (9), 1494-1500, 2004

  The Iron and Steel Institute of Japan

Keywords

• kinetics
• reaction mechanism
• isotope exchange technique
• molten oxide
• P₂O₅
• surface active effect

Details

• CRID: 1390282681429454464
• NII Article ID: 10013533496
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.44.1494
• COI: 1:CAS:528:DC%2BD2cXnvFaqsb4%3D
• ISSN: 13475460
• ISSN: 09151559
• ISSN: http://id.crossref.org/issn/00211583
• ISSN: http://id.crossref.org/issn/09151559
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational1989/44/9/44_9_1494/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed