Combustion of volatile organic compounds over Cu-Mn based mixed oxide type catalysts supported on mesoporous Al2O3, TiO2 and ZrO2
Combustion of volatile organic compounds over Cu-Mn based mixed oxide type catalysts supported on mesoporous Al2O3, TiO2 and ZrO2
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DOI：
10.1016/j.molcata.2012.02.004
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发表时间：
2012-06-01
影响因子：
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通讯作者：
Labhsetwar, Nitin
中科院分区：
文献类型：
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作者：
Doggali, Pradeep;Teraoka, Y.;Labhsetwar, Nitin
以介孔Al_2O_3、介孔TiO_2和介孔ZrO_2为载体，制备了一系列负载型Cu-Mn基催化剂。采用湿浸渍法将Cu-Mn前驱体负载到介孔载体上。这些催化剂载体通过模板法使用天然生物聚合物即壳聚糖制备。研究了这些催化剂对苯和乙醛燃烧的催化活性。采用XRD、BET-SA、O-2-TPD和H-2-TPR等手段对催化剂进行了表征，并对催化反应机理进行了研究。结果表明，负载型催化剂对上述两种反应的活性顺序为Cu-Mn/TiO 2> Cu-Mn/ZrO 2> Cu-Mn/Al 2 O 3。这些结果有趣地表明，催化活性取决于所使用的载体，然而，与这些载体的表面积完全无关。基于TiO 2和ZrO 2的催化剂的更好的活性可能是由于它们的氧化还原性质。O-2-TPD和H-2-TPR低温峰的存在解释了TiO 2和ZrO 2负载型催化剂比Al 2 O3负载型复合氧化物具有更好的氧化还原性能和催化性能。(C)2012爱思唯尔有限公司版权所有。
A series of supported Cu-Mn based catalysts have been synthesized using three different supports mesoporous Al2O3, mesoporous TiO2 and mesoporous ZrO2. Cu-Mn precursors were incorporated on mesoporous supports using wet impregnation method. These catalyst supports were prepared by templating method using a natural biopolymer namely, chitosan. The catalytic activity for benzene and acetaldehyde combustion was studied for these catalysts. The synthesized catalysts have been characterized by XRD, BET-SA, O-2-TPD and H-2-TPR in a view of material characterization, as well as to investigate the mechanistic aspects of catalytic reactions. The bimetallic supported catalysts follow the activity sequence-Cu-Mn/TiO2 > Cu-Mn/ZrO2 > Cu-Mn/Al2O3 for both the reactions studied. These results interestingly show, that the catalytic activity is dependent on the support used, however, quite independent of the surface area of these supports. The better activity of TiO2 and ZrO2 based catalysts is likely due to their redox properties. The existence of low temperature peaks in both O-2-TPD and H-2-TPR explain better redox properties as well as catalytic performance of TiO2 and ZrO2 supported catalysts as compared to those Al2O3 supported mixed oxides. (C) 2012 Elsevier B.V. All rights reserved.