Mechanistic considerations for the reduction of NOx over Pt/Al2O3 and Al2O3 catalysts under lean-burn conditions

被引：118

作者：

Burch, R ^{[1
]}

Sullivan, JA ^{[1
]}

Watling, TC ^{[1
]}

机构：

[1] Univ Reading, Ctr Catalysis Res, Dept Chem, Reading RG6 6AD, Berks, England

来源：

CATALYSIS TODAY | 1998年 / 42卷 / 1-2期

基金：

英国工程与自然科学研究理事会;

关键词：

Al2O3 lean-burn conditions; NOx reduction; reaction mechanisms; Pt catalysts; SO2;

D O I：

10.1016/S0920-5861(98)00072-8

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The reduction of NOx under lean-burn conditions remains a challenging technical and scientific problem. In this paper, a number of catalytic systems are investigated by steady state testing and temperature-programmed desorption/reaction and the results discussed in terms of the similarities between the reactions in an attempt to rationalise apparently unrelated results. The reaction mechanisms are divided into two classes. (1) Reactions where NOx reduction occurs on the Pt surface, (e.g. C3H6NO-O-2 reaction over Pt/Al2O3) which are active at the lowest temperatures and are resistant to sulphur poisoning. (2) DeNO(x) reactions on Al2O3 With a weakly adsorbed reductant, (e.g. C3H8-NO-O-2 reaction over Pt/Al2O3 and Al2O3 and the C3H8NO2-O-2 reaction over Al2O3) which are strongly poisoned by sulphur and appear to occur via the formation of a surface nitrate species on the Al2O3 Which activates the reductant. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：13 / 23

页数：11

共 20 条

[1] ON THE SULFUR-AIDED METAL SUPPORT INTERACTION IN PT/AL2O3-CL CATALYSTS [J].

APESTEGUIA, CR ;

GARETTO, TF ;

BORGNA, A .

JOURNAL OF CATALYSIS, 1987, 106 (01) :73-84

[2]

Beck DD, 1991, 910844 SAE

[3] The difference between alkanes and alkenes in the reduction of NO by hydrocarbons over Pt catalysts under lean-burn conditions [J].

Burch, R ;

Watling, TC .

CATALYSIS LETTERS, 1997, 43 (1-2) :19-23

[4] 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

[5] Adsorbate-assisted NO decomposition in NO reduction by C3H6 over Pt/Al2O3 catalysts under lean-burn conditions [J].

Burch, R ;

Watling, TC .

CATALYSIS LETTERS, 1996, 37 (1-2) :51-55

[6]

BURCH R, UNPUB

[7]

BURCH R, IN PRESS P 4 INT C C

[8]

BURCH R, 1995, CATAL TODAY, V26

[9]

BURCH R, 1949, J CATAL, V196, P45

[10] SELECTIVE REDUCTION OF NO BY HYDROCARBONS AND OXYGENATED HYDROCARBONS OVER METAL-OXIDE CATALYSTS [J].

HAMADA, H .

CATALYSIS TODAY, 1994, 22 (01) :21-40

← 1 2 →