催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (12): 1439-1444.

• 研究论文 • 上一篇    下一篇

Dehydrocyclization of Diphenylamine to Carbazole over Platinum-Based Bimetallic Catalysts

Miroslav VLCKO1,*, Zuzana CVENGROSOVA1, Zuzana CIBULKOVA2, Milan HRONEC1   

  1. 1 Institute of Organic Chemistry, Catalysis and Petrochemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, Bratislava 812 37, Slovakia; 2 Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, Bratislava 812 37, Slovakia
  • 收稿日期:2010-06-05 出版日期:2010-12-13 发布日期:2014-04-26

Dehydrocyclization of Diphenylamine to Carbazole over Platinum-Based Bimetallic Catalysts

Miroslav VLCKO1,*, Zuzana CVENGROSOVA1, Zuzana CIBULKOVA2, Milan HRONEC1   

  1. 1 Institute of Organic Chemistry, Catalysis and Petrochemistry, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, Bratislava 812 37, Slovakia; 2 Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, Bratislava 812 37, Slovakia
  • Received:2010-06-05 Online:2010-12-13 Published:2014-04-26

PDF

1104

摘要： Gas phase dehydrocyclization of diphenylamine (DPA) to carbazole over monometallic and bimetallic 0.4 wt% Pt-based catalysts in a fixed bed reactor was studied in the presence of hydrogen at a temperature of 550 oC. Alumina and carbon supported Pt catalysts showed very high initial activity (> 95%). The selectivity for carbazole over carbon supported Pt catalysts was slightly lower. Doping of the catalyst with potassium led to an increase in the selectivity for carbazole by 15%. Bimetallic Pt-Sn catalysts prepared by co-impregnation were less selective than catalysts prepared by successive impregnation. The selectivity for carbazole over bimetallic Pt-Sn catalysts prepared by successive impregnation was 75%, but their activity decreased with increased Sn loading. Highly active and reasonably selective catalysts were Ir-doped bimetallic Pt-based catalysts. The conversion of diphenylamine over Pt-Ir catalysts was above 98% and the selectivity for carbazole was nearly 55%, while the lifetime was much longer.

关键词: diphenylamine, carbazole, dehydrocyclization, platinum, tin, iridium, bimetallic catalyst

Abstract: Gas phase dehydrocyclization of diphenylamine (DPA) to carbazole over monometallic and bimetallic 0.4 wt% Pt-based catalysts in a fixed bed reactor was studied in the presence of hydrogen at a temperature of 550 oC. Alumina and carbon supported Pt catalysts showed very high initial activity (> 95%). The selectivity for carbazole over carbon supported Pt catalysts was slightly lower. Doping of the catalyst with potassium led to an increase in the selectivity for carbazole by 15%. Bimetallic Pt-Sn catalysts prepared by co-impregnation were less selective than catalysts prepared by successive impregnation. The selectivity for carbazole over bimetallic Pt-Sn catalysts prepared by successive impregnation was 75%, but their activity decreased with increased Sn loading. Highly active and reasonably selective catalysts were Ir-doped bimetallic Pt-based catalysts. The conversion of diphenylamine over Pt-Ir catalysts was above 98% and the selectivity for carbazole was nearly 55%, while the lifetime was much longer.

Key words: diphenylamine, carbazole, dehydrocyclization, platinum, tin, iridium, bimetallic catalyst