摘要
采用差示扫描量热法研究了维氏体歧化反应发生的温度、歧化率以及助催化剂对歧化反应的影响。结果表明,随着维氏体中铁离子缺位浓度(Fe2+/Fe3+)的增大,歧化率逐渐降低。助催化剂对Fe1-xO的歧化反应有抑制作用,研究的助催化剂中,CaO、MgO、ZrO2和V2O5对Fe1-xO的歧化抑制作用较强,这与它们能很好地溶解于铁氧化物晶粒中有关;Al2O3、TiO2、K2O、CeO2和混合稀土氧化物对Fe1-xO歧化反应的抑制作用较弱。多助催化剂的联合使用能够有效抑制Fe1-xO歧化反应的发生,不同样品发生歧化反应的温度相差不大,起始温度约为260℃,峰顶温度约为320℃,终止温度约为400℃。
The influence of disproportionation temperature and disproportionation rate of wustite （Fe1-xO） vacancy concentration. The promoters such as CaO, MgO, ZrO2 and V2 05 possessed strong inhibition for Fe1-xO disproportionation due to their good solubility in iron oxide crystal, and Al2O3 ,TiO2, K20, CeO2 and mixed rare earth oxide had weak inhibition for the disproportionation;the combined use of multi-pro- moters could effectively inhibited Fe1-x O disproportionation. Disproportionation temperature of different catalysts were almost the same; The initial temperature, peak temperature and final temperature were generally about 260 ℃ ,320℃ and 400 ℃ ,respectively.
出处
《工业催化》
CAS
2012年第3期28-33,共6页
Industrial Catalysis
关键词
催化化学
维氏体
歧化反应
歧化率
助催化剂
差示扫描量热法
catalytic chemistry
wustite
disproportionation
disproportionation rate
promoter
differen-tial scanning calorimetry
