TY - GEN

T1 - The influence of the metal-support interaction on the catalytic activity of Pt/Al2O3 and Pt/TiO2 in NH3 oxidation

AU - Svintsitskiy, D. A.

AU - Kibis, L. S.

AU - Stadnichenko, A. I.

AU - Slavinskaya, E. M.

AU - Zaguzin, A. S.

AU - Romanenko, A. V.

AU - Derevyannikova, E. A.

AU - Stonkus, O. A.

AU - Boronin, A. I.

PY - 2019/8/16

Y1 - 2019/8/16

N2 - 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°C. A highly dispersed Pt0 particles with the average particles size ∼1nm were observed after calcination at 400°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 (T50) about 175°C. The calcination of the Pt/Al2O3 catalyst at T>400°C improved the low-temperature activity due to the formation of large Pt0 particles. The T50 value did not vary significantly for Pt/TiO2 samples calcined at different temperatures. Based on XPS, XRD and TPR-H2 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°C had the highest specific catalytic rate of NH3 oxidation. The high activity of the catalyst is likely due to the presence of Pt0 particles with optimal size distribution.

AB - 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°C. A highly dispersed Pt0 particles with the average particles size ∼1nm were observed after calcination at 400°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 (T50) about 175°C. The calcination of the Pt/Al2O3 catalyst at T>400°C improved the low-temperature activity due to the formation of large Pt0 particles. The T50 value did not vary significantly for Pt/TiO2 samples calcined at different temperatures. Based on XPS, XRD and TPR-H2 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°C had the highest specific catalytic rate of NH3 oxidation. The high activity of the catalyst is likely due to the presence of Pt0 particles with optimal size distribution.

KW - CO OXIDATION

KW - PLATINUM NANOPARTICLES

KW - TEMPERATURE OXIDATION

KW - CLUSTERS

KW - SURFACES

KW - SILVER

UR - http://www.scopus.com/inward/record.url?scp=85071235971&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/aff26edf-4e04-3031-b50c-75c949c3106e/

U2 - 10.1063/1.5122927

DO - 10.1063/1.5122927

M3 - Conference contribution

AN - SCOPUS:85071235971

SN - 9780735418882

T3 - AIP Conference Proceedings

BT - 21ST CENTURY: CHEMISTRY TO LIFE

A2 - Lavrenov, Aleksandr V.

PB - American Institute of Physics Inc.

T2 - 21st Century: Chemistry to Life

Y2 - 24 April 2019 through 26 April 2019

ER -