Platinum surface complexes as precursors for H–O recombination catalysts

In this work, the adsorption of platinum (II, IV) chloride complexes from acidic solutions on silica gel modified with quaternary ammonium salts (QAS) was studied. The uptake of the platinum chloride complexes is caused by the formation of ionic (QAS + ) 2 [PtCl x ] 2− ( x  = 4, 6) associates on the...

Full description

Saved in:
Bibliographic Details
Main Authors: Olesya B Volovenko, Olga A Zaporozhets, Vladyslav V Lisnyak, Olga Yu Boldyrieva
Format: Article
Language:English
Published: SAGE Publishing 2017-09-01
Series:Adsorption Science & Technology
Online Access:https://doi.org/10.1177/0263617417708430
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work, the adsorption of platinum (II, IV) chloride complexes from acidic solutions on silica gel modified with quaternary ammonium salts (QAS) was studied. The uptake of the platinum chloride complexes is caused by the formation of ionic (QAS + ) 2 [PtCl x ] 2− ( x  = 4, 6) associates on the surface of silica gel. The isotherms of adsorption are fitted by the Langmuir model. The maximum capacity for [PtCl 4 ] 2− and [PtCl 6 ] 2− is 0.99 and 1.13 mmol/g, correspondingly. The respective adsorption constants K L  = 6.8 and 10 × 10 5  l/mol prove the high affinity of the adsorbates to the QAS-modified surface. Platinum metal nanoparticles supported on the surface of the silica gel were prepared by reducing the adsorbed platinum (II, IV) complexes. Such nanoparticles functioning at the moderate temperature regime have demonstrated a reasonable catalytic activity for the hydrogen and oxygen recombination, and an excellent stability over 35 cycles of the reaction.
ISSN:0263-6174
2048-4038