Effect of hydrothermal treatment temperature on the catalytic performance of single-crystalline La0.5Sr0.5MnO3-δ microcubes for the combustion of toluene

被引：35

作者：

Deng, Jiguang ^{[1
]}

Zhang, Yue ^{[1
]}

Dai, Hongxing ^{[1
]}

Zhang, Lei ^{[1
]}

He, Hong ^{[1
]}

Au, C. T. ^{[2
]}

机构：

[1] Beijing Univ Technol, Coll Environm & Energy Engn, Lab Catalysis Chem & Nanosci, Dept Chem & Chem Engn, Beijing 100124, Peoples R China

[2] Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China

来源：

CATALYSIS TODAY | 2008年 / 139卷 / 1-2期

关键词：

Single-crystalline perovskite-type oxide; Microcube; Toluene oxidation; Volatile organic compounds; Hydrothermal synthesis;

D O I：

10.1016/j.cattod.2008.08.010

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Perovskite-type oxide La0.5Sr0.5MnO3-delta catalysts were fabricated hydrothermally at 220, 240, 250 or 270 degrees C for 50 h (denoted as LSMO-220, LSMO-240, LSMO-250, and LSMO-270, respectively). We characterized the materials by a number of analytical techniques. It was found that the La0.5Sr0.5MnO3-delta samples are single-crystalline cubic perovskite-type oxides in the form of microcubes. The as-fabricated samples displayed various surface and bulk compositions that can be related to the discrepancy in treatment temperature. The surface Mn/(La + Sr + Mn) ratio and the initial H-2 consumption rate at low-temperatures increase according to the sequence of LSMO-240 < LSMO-270 < LSMO-220 < LSMO-250. We observed that the surface Mn4+/Mn3+ ratio and catalytic performance of the materials follow a similar order. The temperature for 100% toluene conversion over LSMO-250 was 280 degrees C. The excellent performance of the materials can be related to (i) Mn surface enrichment, (ii) high Mn4+/Mn3+ ratio, (iii) oxygen nonstoichiometry, and (iv) single-crystalline structure of the catalysts. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：82 / 87

页数：6