Elucidation of Lean-NOx reduction mechanism using kinetic isotope effect

被引：12

作者：

Cho, BK ^{[1
]}

机构：

[1] GM Corp, Ctr Res & Dev, Phys & Phys Chem Dept, Warren, MI 48090 USA

来源：

JOURNAL OF CATALYSIS | 1998年 / 178卷 / 02期

关键词：

D O I：

10.1006/jcat.1998.2169

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 effect of an NO isotope on the kinetics of lean-NOx catalysis in (NO + C2H4 + O-2) reaction mixtures over Pt-ZSM-5 was theoretically analyzed and compared with experimental data obtained with a fixed-bed plug-flow reactor. The large kinetic isotope effect, as well as kinetic oscillations observed previously, was explained by NO decomposition kinetics on Pt surfaces which undergo phase transition between (1 x 1) and (hex) phases induced by adsorbed reactant species. Results indicate the importance of NO decomposition kinetics in lean-NOx catalysis, lending further support to a lean-NOx reduction mechanism which involves NO decomposition accompanied by hydrocarbon oxidation. (C) 1998 Academic Press.

引用

页码：395 / 407

页数：13

共 44 条

[1] MECHANISM OF THE LEAN NOX REACTION OVER CU/ZSM-5 [J].

ANSELL, GP ;

DIWELL, AF ;

GOLUNSKI, SE ;

HAYES, JW ;

RAJARAM, RR ;

TRUEX, TJ ;

WALKER, AP .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1993, 2 (01) :81-100

[2] SELECTIVE REDUCTION OF NITROGEN-OXIDES UNDER OXIDIZING EXHAUST-GAS CONDITIONS [J].

BENNETT, CJ ;

BENNETT, PS ;

GOLUNSKI, SE ;

HAYES, JW ;

WALKER, AP .

APPLIED CATALYSIS A-GENERAL, 1992, 86 (02) :L1-L6

[3] THE ROLE OF NO2 IN THE REDUCTION OF NO BY HYDROCARBON OVER CU-ZRO2 AND CU-ZSM-5 CATALYSTS [J].

BETHKE, KA ;

LI, C ;

KUNG, MC ;

YANG, B ;

KUNG, HH .

CATALYSIS LETTERS, 1995, 31 (2-3) :287-299

[4] NO REDUCTION BY HYDROCARBONS IN AN OXIDIZING ATMOSPHERE OVER TRANSITION METAL-ZIRCONIUM MIXED OXIDES [J].

BETHKE, KA ;

ALT, D ;

KUNG, MC .

CATALYSIS LETTERS, 1994, 25 (1-2) :37-48

[5] STRUCTURE SENSITIVITY OF NO ADSORPTION ON A SMOOTH AND STEPPED PT(100) SURFACE [J].

BONZEL, HP ;

BRODEN, G ;

PIRUG, G .

JOURNAL OF CATALYSIS, 1978, 53 (01) :96-105

[6] SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH ETHANE AND METHANE ON SOME METAL EXCHANGED ZSM-5 ZEOLITES [J].

BURCH, R ;

SCIRE, S .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1994, 3 (04) :295-318

[7] MECHANISM OF THE SELECTIVE REDUCTION OF NITROGEN MONOXIDE ON PLATINUM-BASED CATALYSTS IN THE PRESENCE OF EXCESS OXYGEN [J].

BURCH, R ;

MILLINGTON, PJ ;

WALKER, AP .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1994, 4 (01) :65-94

[8] Activity normalization for lean-NOx catalysts [J].

Cho, BK .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1997, 12 (2-3) :147-160

[9] NITRIC-OXIDE REDUCTION BY ETHYLENE OVER CU-ZSM-5 UNDER LEAN CONDITIONS - STUDY OF REACTION DYNAMICS BY TRANSIENT EXPERIMENTS [J].

CHO, BK .

JOURNAL OF CATALYSIS, 1995, 155 (02) :184-195

[10] Nitric oxide reduction by ethylene over Pt-ZSM-5 under lean conditions: Steady-state activity [J].

Cho, BK ;

Yie, JE .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1996, 10 (04) :263-280

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