摘要
以柠檬酸为络合剂,采用溶胶凝胶法制备NiMoO4超细粒子催化剂.使用DTA、BET比表面测定、XRD和LRS等表征手段考察了热处理条件和焙烧温度对粒子结构的影响.结果表明,在氩气气氛中于210℃分解干凝胶中的柠檬酸,可以避免柠檬酸分解时燃烧大量放热而引起超细微粒的烧结,脱除柠檬酸后的超细粉末为NiMoO4.经400℃以上的高温处理后,微粒明显晶化.
Ni Mo ultrafine particle samples have been prepared by sol gel method with citric acid as complexant. DTA, BET, XRD and LRS have been employed to characterize the structures of the samples obtained by calcining the Ni Mo gel at various temperatures. The results show that when the Ni Mo gel is calcined in air at 210 ℃, citric acid reacts violently with O2, it produces a flash heat and results in an aggregation of the Ni Mo particles. When the gel is calcined in argon,citric acid is removed mildly and NiMoO4 ultrafine particles are formed.After calcined at 500 ℃, the ultrafine particles grow up with a decrease of BET surface area from 51.5 m2·g-1 to 25.0 m2·g-1.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1999年第11期1001-1004,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金!(29773042)
安徽省自然科学基金!(98511437)资助项目
关键词
复合氧化物
溶胶-凝胶法
催化剂
镍
钼
超细粒子
Ni Mo complex oxide, Preparation of ultrafine particles, Sol gel method
