Studying the States of Platinum in Deposited Heteropoly Compounds via Diffuse Reflection IR Spectroscopy

The effect redox treatments have on the state of platinum in systems K x H 4− x [SiW 11 PtO 39 ]/ZrO 2 –Al 2 O 3 and K x H 6− x [SiW 11 NiO 39 ] + K x H 4 –   x [SiW 11 PtO 39 ]/ZrO 2 –Al 2 O 3 is studied using the DRIFTS method with CO as the probe molecule. It is found that platinum was in the Pt...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2021-05, Vol.95 (5), p.949-953
Main Authors: Tkachenko, O. P., Gazarov, R. A., Kustov, L. M.
Format: Article
Language:English
Subjects:
Aluminum oxide
Chemical Kinetics and Catalysis
Chemistry
Chemistry and Materials Science
Infrared spectroscopy
Physical Chemistry
Platinum
Roasting
Thermal stability
Zirconium dioxide
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Summary:The effect redox treatments have on the state of platinum in systems K x H 4− x [SiW 11 PtO 39 ]/ZrO 2 –Al 2 O 3 and K x H 6− x [SiW 11 NiO 39 ] + K x H 4 –   x [SiW 11 PtO 39 ]/ZrO 2 –Al 2 O 3 is studied using the DRIFTS method with CO as the probe molecule. It is found that platinum was in the Pt 2+ and Pt + states in the initial sample calcined at 400°C with deposited Pt–heteropoly compounds (HPCs). Platinum was in the Pt 2+ and Pt 0 states in the initial sample of Pt-HPC + Ni-HPC calcined with the deposited mixture at 400°C. A comparison of two samples shows that mixing Pt-HPC with Ni-HPC improves the thermal stability of the former in redox cycles at 300°C.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024421050277