铂基双金属催化剂上二苯胺脱氢环化生成咔唑(英文)  

Dehydrocyclization of Diphenylamine to Carbazole over Platinum-Based Bimetallic Catalysts

作　　者：Miroslav VLKO Zuzana CVENGROOV Zuzana CIBULKOV Milan HRONEC 

机构地区：[1]Institute of Organic Chemistry,Catalysis and Petrochemistry,Faculty of Chemical and Food Technology,Slovak University of Technology [2]Institute of Physical Chemistry and Chemical Physics,Faculty of Chemical and Food Technology, Slovak University of Technology

出　　处：《催化学报》2010年第12期1439-1444,共6页

基　　金：Supported by Slovak Science Grant Agency (VEGA)

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.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 

分 类 号：O643.32[理学—物理化学]