Hydroxylated surface of GaAs as a scaffold for a heterogeneous Pd catalyst

A novel use of GaAs, namely, as a scaffold for a heterogeneous palladium catalyst, is proposed. Hydroxy groups on the GaAs surface play important roles. During the adsorption of Pd(OAc) 2 on the GaAs surface, the hydroxy groups attract Pd( ii ) species by anion exchange. A subsequent redox reaction...

Full description

Saved in:
Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2012-01, Vol.14 (4), p.1424-143
Main Authors: Nishiwaki, Nagatoshi, Konishi, Tomoya, Hirao, Shotaro, Yamashita, Yoshiyuki, Yoshikawa, Hideki, Shimoda, Masahiko
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Chemistry
Colloidal state and disperse state
Exact sciences and technology
Gallium arsenide
Gallium arsenides
General and physical chemistry
Palladium
Photoelectron spectroscopy
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Scaffolds
Surface chemistry
Surface physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
X-rays
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A novel use of GaAs, namely, as a scaffold for a heterogeneous palladium catalyst, is proposed. Hydroxy groups on the GaAs surface play important roles. During the adsorption of Pd(OAc) 2 on the GaAs surface, the hydroxy groups attract Pd( ii ) species by anion exchange. A subsequent redox reaction proceeds to generate Pd(0) nanoparticles, which are stabilized on the GaAs surface. This process is confirmed by surface-sensitive measurements: diffuse reflection IR spectroscopy and X-ray photoelectron spectroscopy. Moreover, a more bulk-sensitive measurement, hard X-ray photoemission spectroscopy with synchrotron radiation, also supported our considerations. The amounts of Pd(0) nanoparticles on the surface were evaluated by catalytic activity, yield, and recyclability in the Heck reaction, in addition to the deposit test. Pd II species are adsorbed and reduced to Pd 0 on the hydroxylated GaAs surface, which serves as a recyclable heterogeneous catalyst.
ISSN:1463-9076
1463-9084
DOI:10.1039/c1cp22537e