Abstract

[M(NH3)4]A (M=Pt, Pd; A=CrO4, Cr2O7) and [Pt(NH3)4(NO2)(Cr2O7)]NO3 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 MxCr1−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 MCrO2 phase with the delafossite structure followed by its subsequent decomposition into chromium(III) oxide and noble metal. Nanosized Pt−Cr2O3 and Pd−Cr2O3 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.

Original languageEnglish
Pages (from-to)4341-4349
Number of pages9
JournalChemistry - A European Journal
Volume26
Issue number19
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • chromium
  • homogeneous catalysis
  • palladium
  • platinum
  • thermal decomposition
  • PALLADIUM
  • RU
  • PERFORMANCE
  • STABILITY
  • CO
  • PREFERENTIAL OXIDATION
  • CR
  • PD
  • DOUBLE COMPLEX SALTS
  • CELL

Fingerprint Dive into the research topics of 'Tetraammineplatinum(II) and Tetraamminepalladium(II) Chromates as Precursors of Metal Oxide Catalysts'. Together they form a unique fingerprint.

Cite this