The Influence of the Metal-support Interaction on the Catalytic Activity of Pt/Al2O3 and Pt/TiO2 in NH3 Oxidation

被引：6

作者：

Svintsitskiy, D. A. ^{[1
]}

Kibis, L. S. ^{[1
]}

Stadnichenko, A., I ^{[1
]}

Slavinskaya, E. M. ^{[1
]}

Zaguzin, A. S. ^{[1
,2
]}

Romanenko, A., V ^{[1
]}

Derevyannikova, E. A. ^{[1
]}

Stonkus, O. A. ^{[1
,2
]}

Boronin, A., I ^{[1
]}

机构：

[1] Boreskov Inst Catalysis SB RAS, 5 Pr Ak Lavrentieva, Novosibirsk 630090, Russia

[2] Novosibirsk State Univ, 2 Pirogova St, Novosibirsk 630090, Russia

来源：

21ST CENTURY: CHEMISTRY TO LIFE | 2019年 / 2143卷

基金：

俄罗斯科学基金会;

关键词：

CO OXIDATION; PLATINUM NANOPARTICLES; TEMPERATURE OXIDATION; CLUSTERS; SURFACES; SILVER;

D O I：

10.1063/1.5122927

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In the current work the activity of Pt/Al2O3 and Pt/TiO2 catalysts in the reaction of NH3 oxidation was studied depending on the calcination temperature. A combination of XRD, TEM, XPS and TPR methods was applied in order to analyze the influence of the interaction between active component and support on the catalytic properties of the samples. Catalysts were prepared by incipient wetness impregnation using the Pt(NO3)(4) solution with calcination at 400, 600 and 800 degrees C. A highly dispersed Pt-0 particles with the average particles size similar to 1 nm were observed after calcination at 400 degrees C for both Pt/Al2O3 and Pt/TiO2 samples. However, Pt/TiO2 catalyst showed better catalytic characteristics at the low-temperature range with the temperature of 50% NH3 conversion (T-50) about 175 degrees C. The calcination of the Pt/Al2O3 catalyst at T>400 degrees C improved the low-temperature activity due to the formation of large Pt-0 particles. The T-50 value did not vary significantly for Pt/TiO2 samples calcined at different temperatures. Based on XPS, XRD and TPR-H-2 data the strong metal-support interaction (SMSI) was shown for Pt/TiO2 catalysts. SMSI resulted in the stabilization of platinum in a highly dispersed state even after high temperature calcination. Pt/Al2O3 sample calcined at 800 degrees C had the highest specific catalytic rate of NH3 oxidation. The high activity of the catalyst is likely due to the presence of Pt-0 particles with optimal size distribution.

引用

页数：5

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