Effect of CH4 and CO2 on the catalytic formation of OH center dot radicals over La2O3

被引：19

作者：

Hewett, KB ^{[1
]}

Rosynek, MP ^{[1
]}

Lunsford, JH ^{[1
]}

机构：

[1] TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843

来源：

CATALYSIS LETTERS | 1997年 / 45卷 / 1-2期

关键词：

effect of methane and carbon dioxide on hydroxyl radicals; formation of hydroxyl radicals over lanthanum oxide; catalytic combustion; laser-induced fluorescence of hydroxyl radicals;

D O I：

10.1023/A:1019099124988

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：

Surface-generated gas-phase hydroxyl radicals are formed when H2O and O-2 react over La2O3 at 900 degrees C. The addition of CH4 has a strong, negative effect on the production of these radicals, which is attributed to the competition between CH4 and H2O for an active form of oxygen on the surface. At the temperature of these experiments, CO2 had no effect on the formation of OH radicals.

引用

收藏

页码：125 / 128

页数：4

相关论文

共 9 条

[1] HYDROXYL RADICAL FORMATION DURING THE REACTION OF OXYGEN WITH METHANE OR WATER OVER BASIC LANTHANIDE OXIDE CATALYSTS [J].

ANDERSON, LC ;

XU, MT ;

MOONEY, CE ;

ROSYNEK, MP ;

LUNSFORD, JH .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1993, 115 (14) :6322-6326

[2] EVALUATED KINETIC DATA FOR COMBUSTION MODELING [J].

BAULCH, DL ;

COBOS, CJ ;

COX, RA ;

ESSER, C ;

FRANK, P ;

JUST, T ;

KERR, JA ;

PILLING, MJ ;

TROE, J ;

WALKER, RW ;

WARNATZ, J .

JOURNAL OF PHYSICAL AND CHEMICAL REFERENCE DATA, 1992, 21 (03) :411-734

[3] METHANE ACTIVATION BY THE LANTHANIDE OXIDES [J].

CAMPBELL, KD ;

ZHANG, H ;

LUNSFORD, JH .

JOURNAL OF PHYSICAL CHEMISTRY, 1988, 92 (03) :750-753

[4] Formation of hydroxyl radicals from the reaction of water and oxygen over basic metal oxides [J].

Hewett, KB ;

Anderson, LC ;

Rosynek, MP ;

Lunsford, JH .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1996, 118 (29) :6992-6997

[5] TRACE GAS-DETECTION WITH CAVITY RING DOWN SPECTROSCOPY [J].

JONGMA, RT ;

BOOGAARTS, MGH ;

HOLLEMAN, I ;

MEIJER, G .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1995, 66 (04) :2821-2828

[6] OXIDATIVE COUPLING OF METHANE OVER LANTHANA CATALYSTS .2. A MECHANISTIC STUDY USING ISOTOPE TRANSIENT KINETICS [J].

LACOMBE, S ;

ZANTHOFF, H ;

MIRODATOS, C .

JOURNAL OF CATALYSIS, 1995, 155 (01) :106-116

[7] CAVITY RING-DOWN OPTICAL SPECTROMETER FOR ABSORPTION-MEASUREMENTS USING PULSED LASER SOURCES [J].

OKEEFE, A ;

DEACON, DAG .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1988, 59 (12) :2544-2551

[8] THE INFLUENCE OF CATALYTIC ACTIVITY ON THE IGNITION OF BOUNDARY-LAYER FLOWS .1. HYDROXYL RADICAL MEASUREMENTS [J].

PFEFFERLE, LD ;

GRIFFIN, TA ;

WINTER, M ;

CROSLEY, DR ;

DYER, MJ .

COMBUSTION AND FLAME, 1989, 76 (3-4) :325-338

[9] IGNITION AND EXTINCTION OF FLAMES NEAR SURFACES - COMBUSTION OF CH4 IN AIR [J].

VLACHOS, DG ;

SCHMIDT, LD ;

ARIS, R .

AICHE JOURNAL, 1994, 40 (06) :1005-1017