Catalytic flameless combustion of methane over perovskites prepared by flame-hydrolysis

被引：79

作者：

Rossetti, I ^{[1
]}

Forni, L ^{[1
]}

机构：

[1] Univ Milan, Dipartimento Chim Fis & Elettrochim, I-20133 Milan, Italy

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2001年 / 33卷 / 04期

关键词：

perovskite-like catalysts; flame-hydrolysis preparation; methane catalytic flameless combustion mechanism;

D O I：

10.1016/S0926-3373(01)00194-1

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：

A set of perovskite-type catalysts of general formula LaBO3+/-delta (B = Co, Mn, Fe) and a sample of La2NiO4+/-delta were prepared by means of a recently proposed innovative flame-hydrolysis procedure. The catalysts were characterised by nanometer-size particles (20-60 nm), relatively high surface area (ca. 20 m(2)/g), high thermal stability and high phase purity. Their high activity for the catalytic flameless combustion of methane confirmed the validity and versatility of the preparation method. Temperature-programmed -desorption and -reaction, coupled with mass spectrometric analysis, allowed to better understand some aspects of the catalytic behaviour shown by the present samples for the cited reaction. In particular, an interesting correlation between the availability of oxygen at various temperatures, as revealed by the so-called alpha and beta oxygen desorption peaks, and reaction mechanism was found for the different B metals. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：345 / 352

页数：8