EFFECT OF RUTHENIUM-LOADING ON THE CATALYTIC ACTIVITY OF RU-NAZSM-5 ZEOLITES FOR NITROUS-OXIDE DECOMPOSITION

被引：52

作者：

CHANG, YF ^{[1
]}

MCCARTY, JG ^{[1
]}

WACHSMAN, ED ^{[1
]}

机构：

[1] SRI INT,MAT RES CTR,MENLO PK,CA 94025

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1995年 / 6卷 / 01期

关键词：

INTERACTION BETWEEN SODIUM AND RUTHENIUM CATIONS; KINETICS OF CATALYTIC NITROUS OXIDE DECOMPOSITION; NITROUS OXIDE DECOMPOSITION; OXYGEN DEPENDENCY; RU-NAZSM-5; CATALYST; TEMPERATURE-PROGRAMMED TECHNIQUES; ZEOLITES;

D O I：

10.1016/0926-3373(95)00003-8

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 Ru-loading on the performance of Ru-NaZSM-5 catalysts prepared by ion exchange (extent of ruthenium exchange: 20-100%) in the decomposition of nitrous oxide was studied in the temperature range of 40-700 degrees C. The turnover frequency (TOF) for nitrous oxide decomposition (number of nitrous oxide molecules converted per ruthenium site per unit time) increased significantly with decreasing Ru-loading. Although lower Ru-loading resulted in higher TOF and lower apparent activation energy for nitrous oxide decomposition, this occurred at the expense of stronger inhibition by oxygen. Therefore, to obtain catalysts that remain active in the presence of excess oxygen, high Ru-loaded catalysts (close to 100% of exchange) are needed; whereas in the absence of oxygen, low Ru-loadings (close to 20% of exchange) are preferred. The high TOF observed in Ru-NaZSMS-20 was attributed to the interaction between ruthenium and sodium cations.

引用

页码：21 / 33

页数：13

共 19 条

[1] SUPPORT AND PROMOTER EFFECT OF RUTHENIUM CATALYST .1. CHARACTERIZATION OF ALKALI-PROMOTED RUTHENIUM ALUMINA CATALYSTS FOR AMMONIA-SYNTHESIS [J].