NO2 inhibits the catalytic reaction of NO and O2 over Pt

被引：123

作者：

Mulla, SS

Chen, N

Delgass, WN

Epling, WS

Ribeiro, FH

机构：

[1] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA

[2] Cummins Inc, Columbus, IN 47201 USA

来源：

CATALYSIS LETTERS | 2005年 / 100卷 / 3-4期

关键词：

NO oxidation on Pt; NO2 inhibition on NO oxidation; reaction orders; apparent activation energy;

D O I：

10.1007/s10562-004-3466-1

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：

The rate equation for the overall reaction of NO and O-2 over Pt/Al2O3 was determined to be r = k(f)[NO](1.05 +/- 0.08)[O-2] (1.03 +/- 0.08) [NO2] (0.92 +/- 0.07) (1 - beta), with k(f) as the forward rate constant, beta = ([NO2]/K [NO][O-2](1/2)), and K as the equilibrium constant for the overall reaction. An apparent activation energy of 82 kJ mol(-1) +/- 9 kJ mol(-1) was observed. The inhibition by the product NO2 makes it imperative to include the influence of NO2 concentration in any analysis of the kinetics of this reaction. The reaction mechanism that fits our observed orders consists of the equilibrated dissociation of NO2 to produce a surface mostly covered by oxygen, thereby inhibiting the equilibrium adsorption of NO, and the non-dissociative adsorption of O-2, which is the proposed rate determining step.

引用

收藏

页码：267 / 270

页数：4

相关论文

共 18 条

[1] Influence of platinum and rhodium composition on the NOx storage and sulphur tolerance of a barium based NOx storage catalyst [J].

Amberntsson, A ;

Fridell, E ;

Skoglundh, M .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2003, 46 (03) :429-439

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

BENSON, JE ;

BOUDART, M .

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

[3] Kinetics and mechanism of the reduction of NO by C3H8 over Pt/Al2O3 under lean-burn conditions [J].

Burch, R ;

Watling, TC .

JOURNAL OF CATALYSIS, 1997, 169 (01) :45-54

[4] ANALYSIS OF MASS AND HEAT-TRANSFER IN TRANSIENT EXPERIMENTS OVER HETEROGENEOUS CATALYSTS [J].

DEKKER, FHM ;

BLIEK, A ;

KAPTEIJN, F ;

MOULIJN, JA .

CHEMICAL ENGINEERING SCIENCE, 1995, 50 (22) :3573-3580

[5] Overview of the fundamental reactions and degradation mechanisms of NOx storage/reduction catalysts [J].

Epling, WS ;

Campbell, LE ;

Yezerets, A ;

Currier, NW ;

Parks, JE .

CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 2004, 46 (02) :163-245

[6] Model studies of NOx storage and sulphur deactivation of NOx storage catalysts [J].

Fridell, E ;

Persson, H ;

Olsson, L ;

Westerberg, B ;

Amberntsson, A ;

Skoglundh, M .

TOPICS IN CATALYSIS, 2001, 16 (1-4) :133-137

[7] NOx sorption-desorption study:: application to diesel and lean-burn exhaust gas (selective NOx recirculation technique) [J].

Hodjati, S ;

Vaezzadeh, K ;

Petit, C ;

Pitchon, V ;

Kiennemann, A .

CATALYSIS TODAY, 2000, 59 (3-4) :323-334

[8] Determination of kinetic parameters for the water-gas shift reaction on copper catalysts under realistic conditions for fuel cell applications [J].

Koryabkina, NA ;

Phatak, AA ;

Ruettinger, WF ;

Farrauto, RJ ;

Ribeiro, FH .

JOURNAL OF CATALYSIS, 2003, 217 (01) :233-239

[9] Effect of Pt dispersion on the reduction of NO by propene over alumina-supported Pt catalysts under lean-burn conditions [J].

Lee, JH ;

Kung, HH .

CATALYSIS LETTERS, 1998, 51 (1-2) :1-4

[10] The selective catalytic reduction of nitrogen oxides by methane on noble metal-loaded sulfated zirconia [J].

Ohtsuka, H .

APPLIED CATALYSIS B-ENVIRONMENTAL, 2001, 33 (04) :325-333