Pt-Ce-soot generated from fuel-borne catalysts: soot oxidation mechanism

被引：18

作者：

Krishna, K. ^{[1
]}

Makkee, M. ^{[1
]}

机构：

[1] Delft Univ Technol, DelftChemTech, NL-2628 BL Delft, Netherlands

来源：

TOPICS IN CATALYSIS | 2007年 / 42-43卷 / 1-4期

关键词：

diesel soot; fuel-borne catalyst; Pt; Ce; mechanism;

D O I：

10.1007/s11244-007-0183-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Soot containing Ce-, Pt-, Pt-Ce-, Fe-, and Cu-fuel-borne catalysts is generated in a diesel engine, is characterised by XRD, and studied in oxidation with O-2 and NO + O-2 under various reaction conditions. Fe-, Pt-Ce- and Ce-soot are oxidised at lower temperature with O-2, compared with Pt-soot, and the opposite trend is observed with NO + O-2. NO is oxidised to NO2 more efficiently over Pt-soot and decreased the soot oxidation temperature by about 150 degrees C, compared with Ce-, Fe- or Pt-Ce-soot. On the other hand, NO2 is most efficiently utilised over the Pt-Ce- and Ce-soot. The soot oxidation under the different feed gas conditions demonstrates that nitrate species are involved in the oxidation of Ce- and Pt-Ce-soot. The oxidation species with the decreasing order of activity are: (1) nitrates, (2) NO2, (3) lattice oxygen, and (4) gas-phase oxygen. All the above species are involved in the oxidation of Pt-Ce-soot.

引用

页码：229 / 236

页数：8

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