Catalytically Active Pd–Ag Alloy Nanoparticles Synthesized in Microemulsion Template
Artikel i vetenskaplig tidskrift, 2018

This work investigates the possibility to form catalytically active bimetallic Pd–Ag nanoparticles synthesized in the water pools of a reversed microemulsion using methanol, a more environmental- and user-friendly reductant compared to hydrazine or sodium borohydride, which are commonly used for this type of synthesis. The nanoparticles were characterized with regards to crystallinity and size by X-ray diffraction and transmission electron microscopy. CO chemisorption and oxidation followed by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used for investigating the elemental composition of the surface and catalytic activity, respectively. Moreover, the structural composition of the bimetallic particles was determined by scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy. The particles were shown to be crystalline nanoalloys of around 5–12 nm. CO adsorption followed by in situ DRIFTS suggests that the particle surfaces are composed of the same Pd–Ag ratios as the entire particles, regardless of elemental ratio (i.e., no core–shell structures can be detected). This is also shown by numerical simulations using a Monte Carlo based model. Furthermore, CO oxidation confirms that the synthesized particles are catalytically active.

Författare

Linda Ström

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Henrik Ström

Chalmers, Mekanik och maritima vetenskaper, Strömningslära

Per-Anders Carlsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Hanna Härelind

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Farmaceutisk teknologi

Langmuir

0743-7463 (ISSN) 1520-5827 (eISSN)

Vol. 34 33 9754-9761

Grundläggande studier av aktiva säten och reaktionsmekanismer för NOx reduktion i syreöverskott över silver-alumina

Vetenskapsrådet (VR), 2012-08-15 -- 2018-08-31.

Drivkrafter

Hållbar utveckling

Ämneskategorier

Fysikalisk kemi

Kemiska processer

Kemiteknik

Materialkemi

Nanoteknik

Fundament

Grundläggande vetenskaper

DOI

10.1021/acs.langmuir.8b01838

Mer information

Senast uppdaterat

2018-10-28