摘要
介绍了以NiSO4.6H2O和NaOH为原料,固相法合成镍纳米粉。通过XRD、TEM、SEM和XPS等测试手段对产物表面结构进行表征。结果表明,产物为球形分布均匀的纳米镍粉,平均粒径为(30±5)nm。同时考察了不同还原温度和时间下得到的产物的催化活性以及反应中温度、压力和含量等对硝基苯加氢还原催化活性的影响,并在相同的条件下,和Raney Ni进行比较。还原实验表明,400℃还原4 h的产物质量分数为4.13%时,硝基苯转化率高达26.26%,催化加氢活性高于Raney Ni,是相同条件下Raney Ni的9倍左右。压力为0.8 kPa时,硝基苯转化率高达76.42%。
Nanosized nickel powder was synthesized by solid-state reaction from NiSO4·6H2O and NaOH at room temperature and characterized by X-ray diffractometry （XRD）, transmission electron microscopy （TEM） , scanning electron microscopy （ SEM ） and X-ray photoelectron spectroscopy （XPS）. The results showed that the average sizes of nanosized nickel powders were （30 ± 5 ） nm. Factors influencing conversion of nitrobenzene to aniline, such as temperature, reaction time, catalyst dosage and H2 pressure were investigated. Comparison was made between nanosized nickel powder and Raney nickel. It was shown that the nanosized powders had superior activity for hydrogenation of nitrobenzene to aniline to Raney nickel. Nitrobenzene conversion of 26. 26% was obtained over the nanosized nickel powder reduced at 400℃ for 4 h with catalyst dosage of 4.13% （mass fraction）. Nitrobenzene conversion of 76.42% was obtained at H2 pressure of 0.8 kPa.
出处
《工业催化》
CAS
2007年第1期67-70,共4页
Industrial Catalysis
关键词
固相合成
纳米镍粉
催化活性
硝基苯
苯胺
solid-state reaction
nanosized nickel powder
catalytic activity
nitrobenzene hydrogenation
anilin synthesis
