Nano iron oxide reduction with hydrogen at low temperature
Nano iron oxide were reduced with hydrogen at 600℃. Reduction was carried out by means of weight loss technique. The structure changes and different phase accompanying the reduction process were examined with scanning electron microscopes and X-ray diffraction technique. The initial rate was increased owing to the size effect of nanoparticles. The rate controlling step in the reduction process was determined from the gas-solid mathematical formulations and the microstructure of partially reduced oxide. The kinetics of reduction by hydrogen had been found to be a complex mechanism with, initial, nucleation and growth rate controlling, followed by a mixed control of chemical kinetics and external mass diffusion and then a combined chemical reaction and pore mass diffusion at latter stages.
nano iron oxide kinetics hydrogen reduction mechanism weight loss
李秋菊 洪新
上海大学材料科学与工程学院 上海 200072
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）