Research output: Contribution to journal › Article › peer-review
In Situ XPS and MS Study of Methane Oxidation on the Pd–Pt/Al2O3 Catalysts. / Chetyrin, Igor A.; Bukhtiyarov, Andrey V.; Prosvirin, Igor P. et al.
In: Topics in Catalysis, Vol. 63, No. 1-2, 01.03.2020, p. 66-74.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - In Situ XPS and MS Study of Methane Oxidation on the Pd–Pt/Al2O3 Catalysts
AU - Chetyrin, Igor A.
AU - Bukhtiyarov, Andrey V.
AU - Prosvirin, Igor P.
AU - Khudorozhkov, Alexander K.
AU - Bukhtiyarov, Valerii I.
PY - 2020/3/1
Y1 - 2020/3/1
N2 - The bimetallic Pd–Pt/Al2O3 supported catalysts with different Pd/Pt ratios have been prepared and studied in methane oxidation reaction. Comparison of their catalytic properties with those of monometallic Pd/Al2O3 and Pt/Al2O3 samples has shown that the bimetallic catalysts with a relatively low Pt loading (less than 0.4 mol%) are more active than the monometallic ones indicating the synergy effect. An increase in Pt loading above 0.5 mol% decreases the catalytic activity, so that these catalysts become less active than the monometallic Pd/Al2O3 catalysts, but still keep an activity higher than that of the least active monometallic Pt/Al2O3 sample. The chemical states of the palladium and platinum for all the catalysts produced depending on the reaction conditions have been investigated with in situ XPS. It has been shown that even at room temperature the reaction mixture affects the surface composition of the catalysts, which does not change much at higher reaction temperatures. The data have led us to suggestion that activity in the total methane oxidation is promoted by formation of Pd2+, surface fraction of which depends on Pt content in the bimetallic catalysts.
AB - The bimetallic Pd–Pt/Al2O3 supported catalysts with different Pd/Pt ratios have been prepared and studied in methane oxidation reaction. Comparison of their catalytic properties with those of monometallic Pd/Al2O3 and Pt/Al2O3 samples has shown that the bimetallic catalysts with a relatively low Pt loading (less than 0.4 mol%) are more active than the monometallic ones indicating the synergy effect. An increase in Pt loading above 0.5 mol% decreases the catalytic activity, so that these catalysts become less active than the monometallic Pd/Al2O3 catalysts, but still keep an activity higher than that of the least active monometallic Pt/Al2O3 sample. The chemical states of the palladium and platinum for all the catalysts produced depending on the reaction conditions have been investigated with in situ XPS. It has been shown that even at room temperature the reaction mixture affects the surface composition of the catalysts, which does not change much at higher reaction temperatures. The data have led us to suggestion that activity in the total methane oxidation is promoted by formation of Pd2+, surface fraction of which depends on Pt content in the bimetallic catalysts.
KW - Bimetallic Pd–Pt catalysts
KW - In situ measurements
KW - Methane oxidation
KW - X-ray photoelectron spectroscopy
KW - SIZE
KW - COPPER
KW - ALUMINA
KW - PRESSURE
KW - PD
KW - COMBUSTION ACTIVITY
KW - Bimetallic Pd-Pt catalysts
KW - RAY PHOTOELECTRON-SPECTROSCOPY
KW - PD(111) OXIDATION
KW - METAL
KW - BIMETALLIC CATALYSTS
UR - http://www.scopus.com/inward/record.url?scp=85077588863&partnerID=8YFLogxK
U2 - 10.1007/s11244-019-01217-7
DO - 10.1007/s11244-019-01217-7
M3 - Article
AN - SCOPUS:85077588863
VL - 63
SP - 66
EP - 74
JO - Topics in Catalysis
JF - Topics in Catalysis
SN - 1022-5528
IS - 1-2
ER -
ID: 23120947