The effect of H2 and the presence of hot-O(ads) during the decomposition of N2O on platinum

被引：13

作者：

Burch, R ^{[1
]}

Daniells, ST ^{[1
]}

Breen, JP ^{[1
]}

Hu, P ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Chem, CenTACat, Belfast BT9 5AG, Antrim, North Ireland

来源：

CATALYSIS LETTERS | 2004年 / 94卷 / 1-2期

关键词：

N2O+H-2; platinum; catalysts;

D O I：

10.1023/B:CATL.0000019338.35919.c5

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 decomposition of N2O was studied using a silica-supported Pt catalyst. The catalyst was found to exhibit short-lived activity at low temperatures to yield N-2 and O-(ads), the latter remained adsorbed on the surface and poisoned the active sites. Creation of hot-O-(ads) atoms during N2O decomposition is proposed to allow O-2 desorption at intermediate temperatures. Inclusion of H-2 as a reducing agent greatly enhanced the activity and suppressed low temperature deactivation. Simultaneous and sequential pulsing of N2O and H-2 showed that H-2 inclusion with the N2O gas stream produced the greatest activity. A mechanism involving H-(ads) addition to "hot'' oxygen atoms for H2O formation is proposed.

引用

页码：103 / 108

页数：6

共 29 条

[1] THE PROMOTION OF SURFACE-CATALYZED REACTIONS BY GASEOUS ADDITIVES - THE ROLE OF A SURFACE OXYGEN TRANSIENT [J].

AU, CT ;

ROBERTS, MW .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1987, 83 :2047-2059

[2] SPECIFIC ROLE OF TRANSIENT O-(S) AT MG(0001) SURFACES IN ACTIVATION OF AMMONIA BY DIOXYGEN AND NITROUS-OXIDE [J].

AU, CT ;

ROBERTS, MW .

NATURE, 1986, 319 (6050) :206-208

[3] An investigation of the NO/H2/O2 reaction on noble-metal catalysts at low temperatures under lean-burn conditions [J].

Burch, R ;

Coleman, MD .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1999, 23 (2-3) :115-121

[4] A transient kinetic study of the mechanism of the NO+H2 reaction over Pt/SiO2 catalysts -: 1.: Isotopic transient kinetics and temperature programmed analysis [J].

Burch, R ;

Shestov, AA ;

Sullivan, JA .

JOURNAL OF CATALYSIS, 1999, 186 (02) :353-361

[5] Reduction of N2O by H2 on the Ir(110) surface:: oscillations in rate [J].

Carabineiro, SA ;

Nieuwenhuys, BE .

SURFACE SCIENCE, 2001, 495 (1-2) :1-7

[6] Oscillations in the N2O-H2 reaction over Ir(110).: Route to chaos [J].

Carabineiro, SAC ;

van Noort, WD ;

Nieuwenhuys, BE .

SURFACE SCIENCE, 2003, 532 :96-102

[7] The development of a new concept: the role of oxygen transients, defect and precursor states in surface reactions [J].

Carley, AF ;

Davies, PR ;

Roberts, MW .

CATALYSIS LETTERS, 2002, 80 (1-2) :25-34

[8] Oscillating behavior in N2O decomposition over Rh supported on zirconia-based catalysts:: The role of the reaction conditions [J].

Centi, G ;

Dall'Olio, L ;

Perathoner, S .

JOURNAL OF CATALYSIS, 2000, 192 (01) :224-235

[9]

CENTI G, 2000, APPL CATAL A-GEN, V79, P194

[10] N2O as an intermediate for the formation of N2 during SCR (NO):: stationary and transient conditions [J].

Denton, P ;

Schuurman, Y ;

Giroir-Fendler, A ;

Praliaud, H ;

Primet, M ;

Mirodatos, C .

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE C-CHIMIE, 2000, 3 (06) :437-441

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