TiO2 nanoparticles vs. TiO2 nanowires as support in hydrogen peroxide direct synthesis: the influence of N and Au dopingElectronic supplementary information (ESI) available: Schematic representation of the apparatus (S1), XRD analyses (S2) and XPS Au 4f spectra (S3). See DOI: 10.1039/c6ra24357f
The performance of Pd on titania support were evaluated in the direct synthesis of hydrogen peroxide. The equipment used was a high pressure, semi-batch apparatus equipped with a special injection system. Pd (1 wt%) catalysts on TiO 2 materials with different nature were prepared by wet impregnation...
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Main Authors | , , , , , , , , , , , |
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Format | Journal Article |
Language | English |
Published |
31.10.2016
|
Online Access | Get full text |
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Summary: | The performance of Pd on titania support were evaluated in the direct synthesis of hydrogen peroxide. The equipment used was a high pressure, semi-batch apparatus equipped with a special injection system. Pd (1 wt%) catalysts on TiO
2
materials with different nature were prepared by wet impregnation method. Three aspects were investigated: (a) the structure of the support (nanoparticles
vs.
nanowires); (b) the addition of a second active metal (Au); (c) the influence of N-doping of the support. All samples were characterized by means of XPS, TEM and XRD analyses. TiO
2
nanoparticle supported catalyst demonstrated higher H
2
O
2
selectivity and higher turnover frequency (TOF) than the catalysts based on TiO
2
nanowires. The addition of Au to the Pd TiO
2
nanowire catalyst improved the H
2
O
2
selectivity due to altered particle size and electronic effects. Both N-doped versions of the catalysts gave rise to higher H
2
O
2
selectivity than the parent non-doped ones. The synthetic procedure was the source of this observation: larger mean Pd nanoparticles were present, thus favouring the formation of H
2
O
2
as the primary product.
Nitrogen doping is a new strategy to improve catalysts for H
2
O
2
direct synthesis. |
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Bibliography: | 10.1039/c6ra24357f Electronic supplementary information (ESI) available: Schematic representation of the apparatus (S1), XRD analyses (S2) and XPS Au 4f spectra (S3). See DOI |
ISSN: | 2046-2069 |
DOI: | 10.1039/c6ra24357f |