Rapid reduction of titanium dioxide nano-particles by reduction with a calcium reductant
Rapid reduction of titanium dioxide nano-particles by reduction with a calcium reductant
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DOI：
10.1016/j.jpcs.2014.04.016
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发表时间：
2014-09
影响因子：
4
通讯作者：
T. Kikuchi;Masumi Yoshida;Shiki Matsuura;S. Natsui;Etsuji Tsuji;H. Habazaki;R. Suzuki
中科院分区：
文献类型：
--
作者：
T. Kikuchi;Masumi Yoshida;Shiki Matsuura;S. Natsui;Etsuji Tsuji;H. Habazaki;R. Suzuki
在1173 K的氯化钙熔盐中，采用金属钙还原剂还原微米、亚微米和纳米级二氧化钛颗粒，探讨了钙还原剂还原氧化物的机理。将这些氧化物颗粒、作为还原剂的金属钙和作为熔融盐的氯化钙置于钛坩埚中，并在氩气气氛下加热。二氧化钛通过钛酸钙和低级氧化钛还原为金属钛，并将材料在熔融盐中在高温下烧结在一起以形成微孔钛结构。观察到二氧化钛的还原速率随着粒径的减小而增加;因此，还原钛中的残留氧含量降低。由于其低的表面反射，所获得的微孔钛呈现暗灰色。通过在最佳条件下还原，可以成功地获得具有低氧含量（0.42重量%）和大表面积（1.794 m2 g-1）的微孔金属钛。
Micro-, submicron-, and nano-scale titanium dioxide particles were reduced by reduction with a metallic calcium reductant in calcium chloride molten salt at 1173 K, and the reduction mechanism of the oxides by the calcium reductant was explored. These oxide particles, metallic calcium as a reducing agent, and calcium chloride as a molten salt were placed in a titanium crucible and heated under an argon atmosphere. Titanium dioxide was reduced to metallic titanium through a calcium titanate and lower titanium oxide, and the materials were sintered together to form a micro-porous titanium structure in molten salt at high temperature. The reduction rate of titanium dioxide was observed to increase with decreasing particle size; accordingly, the residual oxygen content in the reduced titanium decreases. The obtained micro-porous titanium appeared dark gray in color because of its low surface reflection. Micro-porous metallic titanium with a low oxygen content (0.42 wt%) and a large surface area (1.794 m2g−1) can be successfully obtained by reduction under optimal conditions.