Preparation Of Pt/WO₃ Powders and Thin Coatings on Carbon Black and Metal Supports by The Complex Sol-Gel Process (CSGP)

Abstract

In this work the CSGP was applied for preparation of Pt-WOx and its coatings on carbon black, silver and titan substrates. Saturated tungsten sol (0.15M) was prepared by dissolving (NH4)4W5O17 2.5 H2O in ascorbic acid solution. To this solution H2PtCl6 was added to obtain the molar ratio Pt:W=l. After evaporation and heating at 700°C for 2h homogeneous yellow-green powders were obtained. Another part of this solution was diluted with ethanol and after ultrasonic mixing used for preparation of coatings on Ag and Ti substrates by the immersion technique. Gel layers were dried at 200°C for 20h and then calcined at 700°C for 2h. The resulting white colored layers (thickness 10–65μm) were very adherent. Ascorbate aqueous tungsten-platinum sol diluted to 0.03 or 0.06 M ΣMe was used for preparation of Pt-W (10 and 20 %) catalyst by impregnation of carbon black Vulcan XC-72, followed by thermal treatment in air, argon and hydrogen atmospheres.

Pt/WO3 Nanoparticle-Dispersed Polydimethylsiloxane Membranes for Transparent and Flexible Hydrogen Gas Leakage Sensors

“…This is because the conventional preparation of the Pt/WO 3 nanoparticles involves a heating process at 700–800 K. However, as these substrates are not flexible, they cannot be easily attached to transportation pipes and storage tanks with complicated shapes. Recently, flexible polymers have been used as substrate materials for the fabrication of Pt/WO 3 particle thin films under mild conditions using a sol-gel method [ 8 , 9 , 10 , 11 , 12 ]. Although methods for synthesizing WO 3 particles under mild conditions have already been reported (e.g., a hydrothermal method at 350 K [ 13 ]), the sol-gel process can synthesize WO 3 nanoparticles and simultaneously load the Pt catalyst, producing a large number of nanoparticles compared with hydrothermal methods.…”

Nanoraspberry‐like palladium/spongy nickel oxide for electrooxidation of five light fuels

“…The suitable promoters played the essential roles in the dispersion, shape, and electronic structure of catalytic particles; as well, they can create an antipoisoning behavior for catalyst particles via changing adsorption mechanism. The latest investigation has revealed the catalytic performance of metallic nanoparticles in the promoter presence due to the strong interaction between them 6 can be considerably improved using metal oxide compounds 7 . Ceramic materials, like CeO 2 , SeO 2 , TiO 2 , WO 3 , and Fe 2 O 3 , had exhibited a commendable corrosion resistance by cocatalytic role 8–10 .…”

Archives of Metallurgy and Materials

“…The method of synthesis has been reported in our recent publications in 2014 [3,4]. In the present work, developed at Institute of Nuclear Chemistry and Technology the Complex Sol-Gel Process (CSGP), previously used for synthesis various types' ceramic materials [3][4][5][6][7], was applied to synthesize the perovskite-rutile-type Synroc. To simulate the incorporation process of the high level nuclear waste into a matrix, ionic liquid forms of non-radioactive Co, Cs, Nd and Sr, were used.…”