Catalytic performance of supported Ag nano-particles prepared by liquid phase chemical reduction for soot oxidation

被引：40

作者：

Haneda, Masaaki ^{[1
]}

Towata, Atsuya ^{[2
]}

机构：

[1] Nagoya Inst Technol, Adv Ctr Ceram Res, Tajimi, Gifu 5070071, Japan

[2] Natl Inst Adv Ind Sci & Technol, Adv Mfg Res Inst, Moriyama Ku, Nagoya, Aichi 4638560, Japan

来源：

CATALYSIS TODAY | 2015年 / 242卷

关键词：

Soot oxidation; Silver; Nano-particles; Zirconium oxide; Morphology; Liquid phase chemical reduction; IN-SITU FTIR; PARTICULATE MATTER; CARBON OXIDATION; CO ADSORPTION; ACTIVE OXYGEN; DIESEL SOOT; COMBUSTION; MORPHOLOGY; MECHANISM; AG/ZRO2;

D O I：

10.1016/j.cattod.2014.05.044

中图分类号：

O69 [应用化学];

学科分类号：

070301 [无机化学];

摘要：

The effect of size and morphology of Ag catalysts supported on ZrO2 on the soot oxidation activity was investigated. Spherically shaped Ag nano-particles with the size of ca. 16 nm, prepared by liquid-phase chemical reduction, supported on ZrO2 (Ag/ZrO2(NP)) exhibited outstanding performance for soot oxidation with gaseous O-2 in tight and loose contact modes, compared with hemispherically shaped Ag particles prepared by impregnation (Ag/ZrO2(IMP)). The exceptional performance of Ag/ZrO2(NP) for soot oxidation in loose contact mode was explained by relatively good catalyst-soot contact state and effective migration of active oxygen species from the catalyst to soot. In addition to morphological effect, Ag nano-particles supported on ZrO2 were found to be stabilized in the surface valence state of Ag+, and then oxygen species participating in soot oxidation can be effectively activated on Ag+ sites. We concluded that the presence of Ag+ sites on the surface of Ag nano-particles is responsible for high soot oxidation activity. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：351 / 356

页数：6

共 25 条

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