수소 gas에 의한 산화철의 환원속도에 관한 첨가물의 영향

Abstract

본 실험에서는 산화철의 환원시 rate-determining step이 되는 Wustite의 환원을 900℃이상의 온도에서 수소 gas분위기 하에서 실시하였다.

promoter로서는 Li₂O, MgO, CaO를 각각 첨가하였고 Wustite의 환원속도에 미치는 영향을 고찰하였다. 실험결과 불순물 함량이 1.2wt% 일때가 환원속도가 최대로 나타났다.

순수한 Wustite의 환원속도보다 promoter가 첨가되었을 때의 환원속도가 약 1.5~2배 정도 크게 나타났다.

수소 gas의 유속이 일정할 때는 환원온도가 높을수록 환원속도는 증가하고 일정한 반응온도에서는 수소gas의 유속이 클수록 환원속도가 증가하였다. 이러한 현상은 적절한 수소gas를 흘러 보냄으로서 H₂ gas의 starvation을 피할 수 있는 것으로 생각할 수 있다.

실험결과에서 관찰된 모든 현상들은 lattice defect의 이론보다는 Vol'kenshtein의 lattice disturbance이론으로 잘 설명될 수 있었다.

Doping effect on the reduction rate of wustite by H₂gas wustite reduction which is the rate-determining step of iron oxide reduction, was studied in H₂ gas atmosphere at temperatures above 900℃. Promoters such as Li₂O, MgO and CaO were added respectively to observe their effects on reduction of wustite.

The results showed that the reduction rate maximum at 1.2wt% regardless of promoters.

When promoters were added, the reduction rates were increased at a degree of about 1.5 to 2 times in comparison with that of no addition. At constant H₂gas flow rate the reduction rate increased as the reaction temperature increased. Similarly, at constant reaction temperature the reduction rate increased as the H₂gas flow rate increased.

This may be due to advoiding hydrogen gas starvation. Those could be well explained by the Vol'kenshtein's lattice disturbance theory rather than the lattice defect theory.

Doping effect on the reduction rate of wustite by H₂gas wustite reduction which is the rate-determining step of iron oxide reduction, was studied in H₂ gas atmosphere at temperatures above 900℃. Promoters such as Li₂O, MgO and CaO were added respectively to observe their effects on reduction of wustite.

The results showed that the reduction rate maximum at 1.2wt% regardless of promoters.

When promoters were added, the reduction rates were increased at a degree of about 1.5 to 2 times in comparison with that of no addition. At constant H₂gas flow rate the reduction rate increased as the reaction temperature increased. Similarly, at constant reaction temperature the reduction rate increased as the H₂gas flow rate increased.

This may be due to advoiding hydrogen gas starvation. Those could be well explained by the Vol'kenshtein's lattice disturbance theory rather than the lattice defect theory.