A study on the roles of cobalt species in NOx reduction by propane on Co-Beta

被引：52

作者：

Ohtsuka, H

Tabata, T

Okada, O

Sabatino, LMF

Bellussi, G

机构：

[1] Osaka Gas Co Ltd, Dept Res & Dev, Konohana Ku, Osaka 554, Japan

[2] Eniricerche SpA, I-20097 San Donato Milanese, Italy

来源：

CATALYSIS TODAY | 1998年 / 42卷 / 1-2期

关键词：

NOx; propane; Co-Beta; Raman spectroscopy;

D O I：

10.1016/S0920-5861(98)00075-3

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The states of cobalt loaded on Beta zeolite and their roles in selective catalytic reduction of nitrogen oxide (NOx) by propane were studied. Raman spectroscopy clearly indicated that Co3O4 was formed on highly loaded samples. Spectroscopic characterization combined with catalytic activity tests showed that highly dispersed cobalt is essential for NOx reduction. Co3O4 promotes NOx reduction at low temperatures, but decreases the selectivity to NOx reduction especially at high temperatures through promotion of propane oxidation by oxygen. At ca. 100% loading, a broad band which cannot be assigned to zeolite framework nor Co3O4 was observed at around 600 cm(-1). The intensity of this band showed a strong dependency on SiO2/Al2O3 ratio, and we suggest it is related to C-O-Co species. This cobalt species was suggested to have high activity towards NOx reduction. (C) 1998 Elsevier Science B.V. All rights reserved.

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收藏

页码：45 / 50

页数：6

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