Temperature programmed desorption study of adsorbed species formed by the decomposition of N2O on ion-exchanged copper zeolite catalysts

被引:19
作者
Shimokawabe, M [1 ]
Hirano, K [1 ]
Takezawa, N [1 ]
机构
[1] Hokkaido Univ, Grad Sch Engn, Div Mat Sci & Engn, Sapporo, Hokkaido 0608628, Japan
关键词
Cu-zeolite; dinitrogen monoxide; direct decomposition; characterization; TPD;
D O I
10.1016/S0920-5861(98)00257-0
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
The nature of the adsorbed species on Cu-ZSM-5 (Cu-Z), Cu-Mordenite (Cu-M), and Cu-Y-zeolite (Cu-Y) was investigated by means of temperature programmed desorption (TPD). When dinitrogen monoxide (N2O) came into contact with Cu-zeolites above 573 K, the decomposition of N2O occurred accompanied by the formation of adsorbed oxygen species and adsorbed nitrogen oxide species. In the TPD runs, three O-2 desorption peaks appeared at temperatures of 623, 673, and 753 K and were named alpha-, beta-, and gamma-peaks, respectively. The O-2 desorption at the alpha- and gamma-peaks became quickly saturated after contacting N2O at 598 K, while the amount of O-2 desorbed at the beta-peak increased with time, not reaching a constant level until 120 min of exposure. The activity for the decomposition of N2O decreased with the accumulation of beta-oxygen over the catalyst. The rate of N2O decomposition depended upon the nature and amount of the copper zeolite catalysts available, as determined by the formation of alpha- and/or beta-oxygen. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:117 / 122
页数:6
相关论文
共 13 条
[1]  
BORESKOV GK, 1976, P 6 INT C CAT LOND C, P204
[2]   DECOMPOSITION OF NITROUS-OXIDE ON FEY ZEOLITE [J].
FU, CM ;
KORCHAK, VN ;
HALL, WK .
JOURNAL OF CATALYSIS, 1981, 68 (01) :166-171
[3]  
Kapteijn F, 1996, APPL CATAL B-ENVIRON, V9, P25
[4]   Kinetic analysis of the decomposition of nitrous oxide over ZSM-5 catalysts [J].
Kapteijn, F ;
Marban, G ;
RodriguezMirasol, J ;
Moulijn, JA .
JOURNAL OF CATALYSIS, 1997, 167 (01) :256-265
[5]   N2O DECOMPOSITION OVER IRON-EXCHANGED MORDENITE [J].
LEGLISE, J ;
PETUNCHI, JO ;
HALL, WK .
JOURNAL OF CATALYSIS, 1984, 86 (02) :392-399
[6]   SIMULTANEOUS, CATALYTIC REMOVAL OF NITRIC-OXIDE AND NITROUS-OXIDE [J].
LI, YJ ;
ARMOR, JN .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1993, 3 (01) :55-60
[7]   CATALYTIC DECOMPOSITION OF NITROUS-OXIDE ON METAL EXCHANGED ZEOLITES [J].
LI, YJ ;
ARMOR, JN .
APPLIED CATALYSIS B-ENVIRONMENTAL, 1992, 1 (03) :L21-L29
[8]   ISOTHERMAL OSCILLATIONS IN THE CATALYTIC DECOMPOSITION OF NITROUS-OXIDE OVER CU-ZSM-5 [J].
LINTZ, HG ;
TUREK, T .
CATALYSIS LETTERS, 1995, 30 (1-4) :313-318
[9]   REDOX CATALYSIS OVER IRON ZEOLITES - KINETICS AND MECHANISM [J].
PETUNCHI, JO ;
HALL, WK .
JOURNAL OF CATALYSIS, 1982, 78 (02) :327-340
[10]   A CATALYTIC PROCESS FOR THE DECOMPOSITION OF NITROUS-OXIDE [J].
RILEY, BW ;
RICHMOND, JR .
CATALYSIS TODAY, 1993, 17 (1-2) :277-284