摘要
研究了制备方法、组分含量和反应工艺条件对 (Cu) Ce O2 复合氧化物催化剂上硝基苯加氢制苯胺反应的影响。结果表明 ,硝基苯的转化率和苯胺选择性在 (Cu) Ce O2 中 Cu质量分数为 9%的结构阈值附近达到近 1 0 0 % ,且具有良好的稳定性。优化的反应条件为 1 90℃ ,氢气压力 0 .5 MPa,H2 、C6 H5NO2 摩尔比大于 4,硝基苯进料空速小于 6h- 1 。
The influences of preparation technology and composition of Cu-Ce mixed oxide catalysts as well as the reaction condition of hydrogenation of nitrobenzene over (Cu)CeO_2 have been investigated. Among the four preparation regimes studied the best appeared the coprecipitation method which comprises coprecipitation of Ce(NO_3)_3 and Cu(NO_3)_2 solution with aq. NaOH, followed by calcination of the precipitate at 650 ℃ for 4 h. The catalyst exhibited a satisfactory working life, with both conversion of nitrobenzene and selectivity of aniline being achieved almost quantitatively in hydrogenation reaction at the structure threshold of the catalyst near 9% Cu content. The optimum reaction conditions was as follows: 190 ℃, P_ H_2 0.5 MPa, n(H_2)/ n(C_6H_5NO_2)>4, LHSV<6 h -1.
出处
《应用化学》
CAS
CSCD
北大核心
2002年第11期1049-1053,共5页
Chinese Journal of Applied Chemistry
