Highly dispersed activated carbon supported platinum catalysts prepared by OMCVD: a comparison with wet impregnated catalysts

被引:47
作者
Aksoylu, AE
Faria, JL
Pereira, MFR
Figueiredo, JL
Serp, P
Hierso, JC
Feurer, R
Kihn, Y
Kalck, P
机构
[1] Univ Porto, Fac Engn, Dept Engn Quim, Lab Catalise & Mat, P-4200465 Oporto, Portugal
[2] Ecole Natl Super Ingn Arts Chim & Technol, Lab Catalyse Chim Fine & Polymeres, F-31077 Toulouse 04, France
[3] Ecole Natl Super Ingn Arts Chim & Technol, CIRIMAT, CNRS,UMR 5085, Lab Interfaces & Mat, F-31077 Toulouse 04, France
[4] CNRS, CEMES, F-31055 Toulouse, France
关键词
platinum catalysts; activated carbon support; chemical vapor deposition; impregnation; benzene hydrogenation;
D O I
10.1016/S0926-860X(02)00556-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This study shows that the air oxidation treatment of an activated carbon originates drastic changes in its chemical surface composition leading to the formation of a less acidic surface with thermally stable oxygenated groups, mainly hydroxyl and carbonyl groups. The oxidation treatment also induces changes in the textural properties, although less pronounced than the extent of the chemical changes. The degree of oxidation was characterized by temperature programmed desorption (TPD). Pt/AC catalysts were prepared on the activated carbon supports by organometallic chemical vapor deposition (OMCVD). Another set of catalysts was prepared on the same supports by the classical incipient wetness impregnation method. The platinum loading of each sample was kept fixed at 1 wt.%. These Pt/AC catalysts were characterized by H-2 adsorption, temperature programmed reduction (TPR), electron microscopy (TEM), infrared spectroscopy (DRIFTS) and tested for their activity in benzene hydrogenation. The changes in the physical and chemical structures of the activated carbons have pronounced effects on the characteristics of both impregnated and OMCVD samples. The results revealed that the preparation by OMCVD on the air oxidized support leads to a drastic increase in both Pt dispersion and catalytic activity. No pronounced differences were observed between the dispersion and activity of impregnated and OMCVD samples that were prepared on the non-oxidized activated carbon. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:357 / 365
页数:9
相关论文
共 18 条
[1]   Bimetallic Pt-Sn catalysts supported on activated carbon - I. The effects of support modification and impregnation strategy [J].
Aksoylu, AE ;
Madalena, M ;
Freitas, A ;
Figueiredo, JL .
APPLIED CATALYSIS A-GENERAL, 2000, 192 (01) :29-42
[2]   Surface-directed deposition of platinum nanostructures on graphite by chemical vapor deposition [J].
Aktary, M ;
Lee, CE ;
Xing, Y ;
Bergens, SH ;
McDermott, MT .
LANGMUIR, 2000, 16 (14) :5837-5840
[3]   Carbons as supports for industrial precious metal catalysts [J].
Auer, E ;
Freund, A ;
Pietsch, J ;
Tacke, T .
APPLIED CATALYSIS A-GENERAL, 1998, 173 (02) :259-271
[4]   REACTIONS OF(PI-1,5-CYCLOOCTADIENE)ORGANOPLATINUM(II)COMPOUNDS AND SYNTHESIS OF PERFLUOROALKYLPLATINUM COMPLEXES [J].
CLARK, HC ;
MANZER, LE .
JOURNAL OF ORGANOMETALLIC CHEMISTRY, 1973, 59 (OCT1) :411-428
[5]  
DERBYSHIRE F, 1986, APPL CATAL, V27, P12
[6]   A DRIFTS STUDY OF THE FORMATION OF SURFACE GROUPS ON CARBON BY OXIDATION [J].
FANNING, PE ;
VANNICE, MA .
CARBON, 1993, 31 (05) :721-730
[7]   Modification of the surface chemistry of activated carbons [J].
Figueiredo, JL ;
Pereira, MFR ;
Freitas, MMA ;
Orfao, JJM .
CARBON, 1999, 37 (09) :1379-1389
[8]  
Hierso JC, 1998, APPL ORGANOMET CHEM, V12, P161, DOI 10.1002/(SICI)1099-0739(199803)12:3<161::AID-AOC689>3.3.CO
[9]  
2-Y
[10]   CHEMICAL-VAPOR-DEPOSITION AS A NOVEL TECHNIQUE FOR CATALYST PREPARATION - MODELING OF ACTIVE PHASE PROFILES [J].
MOENE, R ;
MAKKEE, M ;
MOULIJN, JA .
CHEMICAL ENGINEERING JOURNAL AND THE BIOCHEMICAL ENGINEERING JOURNAL, 1993, 53 (01) :13-24