催化学报 ›› 2019, Vol. 40 ›› Issue (11): 1693-1703.DOI: 10.1016/S1872-2067(18)63179-1

• 论文 • 上一篇    下一篇

催化剂制备方法对用于腈加氢制饱和胺的负载型Ni催化剂性能的影响

D. J. Segobia, A. F. Trasarti, C. R. Apesteguía   

  1. Catalysis Science and Engineering Research Group (GICIC), INCAPE, UNL-CONICET, CCT Conicet-Paraje El Pozo, Santa Fe, 阿根廷
  • 收稿日期:2018-10-03 修回日期:2018-10-12 出版日期:2019-11-18 发布日期:2019-09-06
  • 通讯作者: C. R. Apesteguía

Effect of the catalyst preparation method on the performance of Ni-supported catalysts for the synthesis of saturated amines from nitrile hydrogenation

D. J. Segobia, A. F. Trasarti, C. R. Apesteguía   

  1. Catalysis Science and Engineering Research Group (GICIC), INCAPE, UNL-CONICET, CCT Conicet-Paraje El Pozo, (3000) Santa Fe, Argentina
  • Received:2018-10-03 Revised:2018-10-12 Online:2019-11-18 Published:2019-09-06
  • Contact: C. R. Apesteguía

摘要: 采用浸渍法(Ni/SiO2-I)或氨法(Ni/SiO2-A)制备了硅胶负载的Ni催化剂,考察了它们和Ni/SiO2-Al2O3-I样品催化丁腈液相加氢制备饱和胺反应性能.Ni/SiO2-I是非酸性催化剂,含有大的Ni0颗粒,与载体相互作用较弱;而Ni/SiO2-A中含有低还原度的Ni-层状硅酸盐,存在Ni2+物种,因而是酸性催化剂.在Ni/SiO2-I催化剂上反应产物基本上是丁胺(80%),副产物仅为二丁胺.相反,以Ni/SiO2-A为催化剂时,得到二丁胺(49%)和三丁胺(45%)的混合物,而丁胺的生成活性几乎完全得到抑制.对于Ni/SiO2-A催化剂,丁胺强吸附在邻近Ni0原子的表面酸性位上,在反应过程中不能扩散到液相中,从而促进了吸附的丁基亚胺/丁胺物种之间缩合生成更高级的胺类,因此造成选择性生成伯胺和仲胺.

关键词: 腈加氢, 饱和胺, 负载型Ni催化剂, 催化剂制备, 镍-层状硅酸盐类

Abstract: The liquid-phase hydrogenation of butyronitrile to saturated amines was studied on sili-ca-supported Ni catalysts prepared by either incipient-wetness impregnation (Ni/SiO2-I) or ammonia (Ni/SiO2-A) methods. A Ni/SiO2-Al2O3-I sample was also used. Ni/SiO2-I was a non-acidic catalyst containing large Ni0 particles of low interaction with the support, while Ni/SiO2-A was an acidic catalyst due to the presence of Ni2+ species in Ni phyllosilicates of low reducibility. Ni/SiO2-I formed essentially butylamine (80%), and dibutylamine as the only byproduct. In contrast, Ni/SiO2-A yielded a mixture of dibutylamine (49%) and tributylamine (45%), being the formation of butylamine almost completely suppressed. The selective formation of secondary and tertiary amines on Ni/SiO2-A was explained by considering that butylamine is not release to the liquid phase during the reaction because it is strongly adsorbed on surface acid sites contiguous to Ni0 atoms, thereby favoring the butylimine/butylamine condensation to higher amines between adsorbed species.

Key words: Nitrile hydrogenation, Saturated amines, Ni-supported catalysts, Ni-phyllosilicates, Catalyst preparation