化工进展

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活性炭负载纳米镍催化葡萄糖还原胺化反应

邸建辉,李云庆,王家喜   

  1. 河北工业大学化工学院,天津 300130
  • 出版日期:2011-06-05 发布日期:2011-06-05

Catalytic reductive amination of glucose promoted by nano Ni supported on active carbon

DI Jianhui,LI Yunqing,WANG Jiaxi   

  1. School of Chemical Engineering,Hebei University of Technology,Tianjin 300130,China
  • Online:2011-06-05 Published:2011-06-05

摘要:

在活性炭存在下硼氢化钠还原氯化镍制备了炭负载纳米镍(Ni/AC),用扫描电镜、透射电镜、X射线衍射分析表征了催化剂的结构,以一步法葡萄糖的还原胺化合成葡甲胺的反应为模型,考察了催化剂的制备、催化反应条件等因素对葡甲胺产率的影响。产物结构经核磁共振波谱表征。葡萄糖与甲胺先形成环状甲胺基葡萄糖,进而在催化剂作用下被还原成葡甲胺。研究发现,催化剂制备过程中的NaCl对催化反应具有抑制作用。三乙胺的加入能够提高催化剂的催化性能。在n葡萄糖nNi=91n葡萄糖n甲胺=11.8nNin三乙胺=12.580 及氢气5.0 MPa下反应1 h,葡甲胺的产率达到了98%

Abstract:

Supported nickelNi/ACwas prepared by reduction of NiCl2 with NaBH4 in the presence of activated carbon. The catalystNi/Cwas characterized by SEMTEMand XRD. The effects of preparation and catalytic reaction conditions on catalytic activity were evaluated by using reductive amination of glucose with methylamine as a model reaction. The reaction product was analyzed by NMR. The glucose reacted with methylamine to form cyclo-methylamino-glucosethen was reduced under the action of the catalyst to form N-methyl-D-glucamine. The NaCl formed in the reduction preparation of the catalyst inhibited the catalytic reductive amination. The catalyst performance could be improved by adding triethylamine. The yield of N-methyl-D-glucamine was up to 98% at reaction temperature of 80 H2 pressure of 5.0 MPamolar ratio of glucose to Niglucose to MeNH2 and glucose to Et3N 9111.8 and 12.5respectively.

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