Highly selective ammonia oxidation to nitric oxide over supported Pt nanoparticles

被引：28
|
作者：
Schaeffer, Johannes [1 ]
Kondratenko, Vita A. [1 ]
Steinfeldt, Norbert [1 ]
Sebek, Michael [1 ]
Kondratenko, Evgenii V. [1 ]
机构：
[1] Univ Rostock, Leibniz Inst Katalyse eV, D-18059 Rostock, Germany
来源：
JOURNAL OF CATALYSIS | 2013年 / 301卷
关键词：
Ammonia oxidation; Mechanism; Nanoparticles; Platinum; Nitric oxide; TAP reactor; TEMPORAL ANALYSIS; CATALYTIC-PROPERTIES; METAL NANOPARTICLES; DIRECTING FACTORS; PRODUCTS REACTOR; PGM GAUZES; PLATINUM; KINETICS; NH3; MECHANISM;
D O I：
10.1016/j.jcat.2013.02.010
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：
Tailored Pt nanoparticles were prepared in strong alkaline ethylene glycol solution and deposited on alpha-Al2O3, gamma-Al2O3, and CeO2-TiO2. The resulting supported catalytic materials were applied for ammonia oxidation between 473 and 1073 K in the temporal analysis of products reactor. Although the catalysts possessed only 0.005 wt.% Pt, they were active and selective for nitric oxide formation. The NO selectivity obtained over Pt/CeO2-TiO2 between 873 and 1073 K was around 98% and exceeded that of industrially relevant Pt wire. Both alumina-supported catalysts were less selective. Pt/CeO2-TiO2 also showed the highest NO selectivity in steady-state ambient pressure tests. The superior performance of Pt/CeO2-TiO2 is related to a synergy effect between the noble metal and the support since they provide adsorbed and lattice oxygen species for selective NH3 oxidation to NO in a complementary fashion. (C) 2013 Elsevier Inc. All rights reserved.
引用
收藏
页码：210 / 216
页数：7
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