Deposition of Monodisperse Platinum Nanoparticles of Controlled Size on Different Supports

Abstract

Monodisperse platinum nanoparticles with controlled size were synthesized by polyol synthesis and supported on γ-Al 2 O 3 , SiO 2 and carbon nanotubes (CNT) by the colloid deposition method. The average size of Pt nanoparticles in colloidal solutions and on supports was determined by TEM images and from XRD patterns. The size of Pt nanoparticles supported on SiO 2 and CNT determined from XRD patterns is in a good agreement with size obtained from the TEM analyses. There were shown that no agglomeration and size changing of Pt nanoparticles on these supports were observed. All these findings illustrate that the method of colloid deposition allows one to obtain catalyst with monodisperse platinum nanoparticles of controlled size deposited on different supports without changing the nanoparticle's size and morphology.

Improving Plasma Regeneration Conditions of Pt–Sn/Al2O3 in Naphtha Catalytic Reforming Process Using Atmospheric DBD Plasma System

“…The peaks assigned to Al 2 O 3 were at 2h = 37.1°, 45.4°, and 67.6°and the peak at 2h = 39.7°was attributed to Pt [36]. There was no observable changes in the diffraction patterns of Al 2 O 3 and Pt, which indicated that pin to plate DBD plasma regeneration system has not changed the catalyst bulk phase structure [37][38][39][40]. It can be also considered that XRD results showed no typical crystalline carbon diffraction peaks, which indicated that no crystalline carbon was formed.…”

Shape‐directed platinum nanoparticle synthesis: nanoscale design of novel catalysts

“…Polymers bind to nanoparticle surfaces by similar functional groups but wrap around the nanoparticle, binding at multiple sites to direct growth while preventing agglomeration. Some common polymers used for this directing method include polyvinylpyrrolidone (PVP), block copolymers and even short peptide sequences . Other directing agents which also act as stabilizers include sodium citrate, sodium polyacrylate and sodium succinate …”

“…This binds the nanoparticles to a larger structure and allows for easy addition and removal of the catalysts from reaction solutions. While on a support, the nanoparticles' size and morphology are retained and capping agents can be removed from nanoparticle surfaces to improve catalytic performance with minimal effect on size and morphology of the nanoparticle . However, the supports may interact with the nanoparticles and affect performance either beneficially or detrimentally.…”

“…However, some alternatives such as morphological or functionalized carbons have been previously used. The decoration of ‘precursor’ Pt molecules onto the walls of CNTs has been reported . Pt nanoparticles supported on CNTs via electrochemical methods showed promising electrocatalytic performance.…”

Preparation of Ag@mSiO 2 and Pt@mSiO 2 nano composites using trioctylmethyl ammonium hydrogen phthalate (TOMAHP) ionic liquid as reaction medium

“…However, the uncontrolled particle size, non-uniform distribution of metal NPs on to the inert support, less efficiency and complex chemical processes involved for preparation of such nano composites are the main drawbacks of the process [23]. In recent past, researchers have developed more efficient method called polyol method for preparation of supported metal NPs with desired sizes and shapes [2,16,17]. In this method, the metal NPs are prepared using a polymer at high pH in the presence of metal salt, reducing agent and ethylene glycol at high temperature.…”