Platinum dispersion measurements for Pt/BaO/Al2O3, NOx storage catalysts

被引：41

作者：

Dawody, J ^{[1
]}

Eurenius, L

Abdulhamid, H

Skoglundh, M

Olsson, E

Fridell, E

机构：

[1] Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[3] Chalmers Univ Technol, Dept Chem & Biol Engn, SE-41296 Gothenburg, Sweden

来源：

APPLIED CATALYSIS A-GENERAL | 2005年 / 296卷 / 02期

关键词：

characterization; platinum dispersion; TEM; SEM; EDS; CO chemisorption; CO TPD; H-2; chemisorption; NO dissociation; barium;

D O I：

10.1016/j.apcata.2005.07.060

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：

In this investigation different experimental methods to determine the platinum dispersion of Pt/BaO/Al2O3 NOx storage catalysts are compared. The dispersion of platinum is determined independently using temperature programmed desorption of CO, dissociation of N2O, static volumetric CO and H-2 chemisorption, dynamic CO chemisorption and transmission electron microscopy. For Pt/BaO/Al2O3, reproducible results are obtained when the platinum dispersion is determined from N2O dissociation, CO and H-2 chemisorption. However, repeated CO-TPD experiments result in decreased amount of desorbed CO, which limits this method to determine platinum dispersion for Pt/BaO/Al2O3 samples. For Pt/Al2O3, Similar values for platinum dispersion are obtained for all methods used in the study. In addition to the platinum dispersion investigations, the surface morphology of Pt/Ba/Al2O3 samples and the distribution of different elements are studied using SEWEDS. The SEM-EDS analyses show that the platinum is evenly distributed over the entire sample surface, while the distribution of barium is more uneven. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：157 / 168

页数：12

共 35 条

[1]

ANDERSON JR, 1985, INTRO CHARACTERIZATI, P24

[2] Interrupted-temperature programmed desorption of hydrogen over silica-supported platinum catalysts: The distribution of activation energy of desorption and the phenomena of spillover and reverse spillover of hydrogen [J].

Arai, M ;

Fukushima, M ;

Nishiyama, Y .

APPLIED SURFACE SCIENCE, 1996, 99 (02) :145-150

[3] HYDROGEN-OXYGEN TITRATION METHOD FOR MEASUREMENT OF SUPPORTED PLATINUM SURFACE AREAS [J].

BENSON, JE ;

BOUDART, M .

JOURNAL OF CATALYSIS, 1965, 4 (06) :704-&

[4] Removal of nitrogen oxides from the exhaust of a lean-tune gasoline engine [J].

Bogner, W ;

Kramer, M ;

Krutzsch, B ;

Pischinger, S ;

Voigtlander, D ;

Wenninger, G ;

Wirbeleit, F ;

Brogan, MS ;

Brisley, RJ ;

Webster, DE .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1995, 7 (1-2) :153-171

[5] A combined transient and computational study of the dissociation of N2O on platinum catalysts [J].

Burch, R ;

Daniells, ST ;

Breen, JP ;

Hu, P .

JOURNAL OF CATALYSIS, 2004, 224 (02) :252-260

[6]

DAWODY J, 2005, J MOL CATAL A, V225

[7] THE ADSORPTION OF OXYGEN AND OTHER GASES ON COPPER [J].

DELL, RM ;

STONE, FS ;

TILEY, PF .

TRANSACTIONS OF THE FARADAY SOCIETY, 1953, 49 (02) :195-201

[8] STRUCTURE AND ACTIVITY OF SUPPORTED METAL CATALYSTS .2. CRYSTALLITE SIZE AND CO CHEMISORPTION ON PLATINUM/SILICA CATALYSTS [J].

DORLING, TA ;

MOSS, RL .

JOURNAL OF CATALYSIS, 1967, 7 (04) :378-&

[9]

Dou L-Q, 1990, APPL CATAL, V66, P235

[10] Further evidence of multiple NOx sorption sites on NOx storage/reduction catalysts [J].

Epling, WS ;

Parks, JE ;

Campbell, GC ;

Yezerets, A ;

Currier, NW ;

Campbell, LE .

CATALYSIS TODAY, 2004, 96 (1-2) :21-30

← 1 2 3 4 →