Premium
Tetraammineplatinum(II) and Tetraamminepalladium(II) Chromates as Precursors of Metal Oxide Catalysts
Author(s) -
Filatov Evgeny,
Lagunova Varvara,
Potemkin Dmitry,
Kuratieva Natalia,
Zadesenets Andrey,
Plyusnin Pavel,
Gubanov Alexander,
Korenev Sergey
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201905391
Subject(s) - prox , delafossite , chromium , chemistry , thermal decomposition , thermogravimetry , inorganic chemistry , oxide , metal , catalysis , oxidizing agent , inert gas , decomposition , carbon monoxide , organic chemistry
[M(NH 3 ) 4 ]A (M=Pt, Pd; A=CrO 4 , Cr 2 O 7 ) and [Pt(NH 3 ) 4 (NO 2 )(Cr 2 O 7 )]NO 3 complex salts were synthesized and characterized by a number of physicochemical methods of analysis (IR, single‐crystal and powder XRD, and simultaneous thermogravimetry and differential scanning calorimetry with evolved gas analysis mass spectrometry). Thermolysis of the salts obtained in a hydrogen atmosphere proceeds with the partial reduction of chromium to a metallic state and the formation of M x Cr 1− x (M=Pt, Pd) metal solid solution with a chromium content of up to 22 at % and chromium(III) oxide. The thermal decomposition of salts in an inert and oxidizing atmosphere passes through the formation stage of the MCrO 2 phase with the delafossite structure followed by its subsequent decomposition into chromium(III) oxide and noble metal. Nanosized Pt−Cr 2 O 3 and Pd−Cr 2 O 3 composites obtained by the thermolysis of precursor salts in air at 500 °C and being held at this temperature for 1 h showed a high catalytic activity in the CO total oxidation (TOX) and preferential oxidation in the excess of hydrogen (PROX) processes compared with that of monometallic Pt and Pd powders.