Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for low Temperature NH3 Oxidation. / Svintsitskiy, Dmitry A.; Kibis, Lidiya S.; Stadnichenko, Andrey I. и др.
в: ChemCatChem, Том 12, № 3, 06.02.2020, стр. 867-880.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Insight into the Nature of Active Species of Pt/Al2O3 Catalysts for low Temperature NH3 Oxidation
AU - Svintsitskiy, Dmitry A.
AU - Kibis, Lidiya S.
AU - Stadnichenko, Andrey I.
AU - Slavinskaya, Elena M.
AU - Romanenko, Anatoly V.
AU - Fedorova, Elizaveta A.
AU - Stonkus, Olga A.
AU - Doronkin, Dmitry E.
AU - Marchuk, Vasyl
AU - Zimina, Anna
AU - Casapu, Maria
AU - Grunwaldt, Jan Dierk
AU - Boronin, Andrei I.
N1 - Publisher Copyright: © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
PY - 2020/2/6
Y1 - 2020/2/6
N2 - Two series of Pt/γ-Al2O3 catalysts for low temperature NH3 oxidation were prepared using Pt(NO3)4 and H2PtCl6 precursors. Using both precursors results in the formation of small Pt particles (d<1.5 nm), however, Cl-containing Pt precursors give a higher fraction of highly dispersed Pt species. Such species show high stability against thermal or H2 treatment probably due to the presence of a substantial amount of chlorine on the surface. Treatment of the samples prepared from Pt(NO3)4 with H2 leads to the formation of metallic Pt nanoparticles accompanied by the improvement of catalytic activity in NH3 oxidation at T<200 °C. The main products of ammonia oxidation at temperatures below 250 °C were molecular nitrogen and nitrous oxide with the N2 selectivity reaching 80 %. Operando XANES/EXAFS revealed that even after H2 pretreatment at least 40 % of Pt surface remains in oxidized state under reaction conditions resulting in the appearance of N2O as a by-product.
AB - Two series of Pt/γ-Al2O3 catalysts for low temperature NH3 oxidation were prepared using Pt(NO3)4 and H2PtCl6 precursors. Using both precursors results in the formation of small Pt particles (d<1.5 nm), however, Cl-containing Pt precursors give a higher fraction of highly dispersed Pt species. Such species show high stability against thermal or H2 treatment probably due to the presence of a substantial amount of chlorine on the surface. Treatment of the samples prepared from Pt(NO3)4 with H2 leads to the formation of metallic Pt nanoparticles accompanied by the improvement of catalytic activity in NH3 oxidation at T<200 °C. The main products of ammonia oxidation at temperatures below 250 °C were molecular nitrogen and nitrous oxide with the N2 selectivity reaching 80 %. Operando XANES/EXAFS revealed that even after H2 pretreatment at least 40 % of Pt surface remains in oxidized state under reaction conditions resulting in the appearance of N2O as a by-product.
KW - ammonia slip catalyst
KW - NH
KW - operando spectroscopy
KW - platinum
KW - Pt/AlO
KW - RAY-ABSORPTION SPECTROSCOPY
KW - EMISSION CONTROL
KW - NO OXIDATION
KW - SELECTIVE OXIDATION
KW - Pt
KW - PLATINUM
KW - CO OXIDATION
KW - Al2O3
KW - OXYGEN
KW - NH3
KW - NITROGEN
KW - PARTICLE-SIZE
KW - AMMONIA OXIDATION
KW - Pt/Al2O3
UR - http://www.scopus.com/inward/record.url?scp=85075913520&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/c8594a8c-91f1-36d7-9212-193775ac2b4c/
U2 - 10.1002/cctc.201901719
DO - 10.1002/cctc.201901719
M3 - Article
AN - SCOPUS:85075913520
VL - 12
SP - 867
EP - 880
JO - ChemCatChem
JF - ChemCatChem
SN - 1867-3880
IS - 3
ER -
ID: 22575236