Ir-C xerogels synthesized by sol-gel method for NO reduction

被引：18

作者：

Liu, Zhi ^{[1
,2
]}

Wang, Aiqin ^{[1
]}

Wang, Xiaodong ^{[1
]}

Zhang, Tao ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

CATALYSIS TODAY | 2008年 / 137卷 / 2-4期

关键词：

carbon xerogels; iridium; NO reduction; carbon monoxide; sol-gel;

D O I：

10.1016/j.cattod.2008.03.004

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Iridium-carbon (Ir-C) xerogels were synthesized via a one-pot sol-gel polycondensation of hexachloroiridic acid, resorcinol and formaldehyde, followed by carbonization in a nitrogen atmosphere at 500-1000 degrees C. The samples were characterized by various techniques including N-2 adsorption, XRD and TEM. The N-2 adsorption showed that the Ir-C samples were of microporous structures, and their specific surface areas increased with the pyrolysis temperature. Both the XRD and TEM revealed that the It particles in the Ir-C samples were highly dispersed in the carbon matrix, in contrast with the large Ir particles in the Ir/C sample which was obtained by impregnation. The Ir-C xerogels exhibited high activities and selectivities towards N-2 in the reduction of NO with carbon or CO. In particular, the Ir-C samples behaved much stably than the Ir/C, demonstrating the superiority of the one-pot synthesis method. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：162 / 166

页数：5

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