---
_id: '64002'
abstract:
- lang: eng
text: The production of formaldehyde on industrial scale requires huge amounts of
energy due to the involvement of reforming processes in combination with the demand
in the megaton scale. Hence, a direct route for the transformation of (bio)methane
to formaldehyde would decrease costs and puts less pressure on the environment.
Herein, we report on the use of zinc modified silicas as possible support materials
for vanadium catalysts and the resulting consequences for the performance in the
selective oxidation of methane to formaldehyde. After optimization of the Zn content
and reaction conditions, a remarkably high space-time yield of 12.4 kgCH2O·kgcat−1·h−1
was achieved. As a result of the extensive characterization by means of UV–vis,
Raman, XANES and NMR spectroscopy it was found that vanadium is in the vicinity
of highly dispersed zinc atoms which promote the formation of active vanadium
species as supposed by theoretical calculations. This work presents a further
step of catalyst development towards direct industrial methane conversion which
may help to overcome current limitations in the future.
author:
- first_name: Benny
full_name: Kunkel, Benny
last_name: Kunkel
- first_name: Dominik
full_name: Seeburg, Dominik
last_name: Seeburg
- first_name: Anke
full_name: Kabelitz, Anke
last_name: Kabelitz
- first_name: Steffen
full_name: Witte, Steffen
last_name: Witte
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: Hergen
full_name: Breitzke, Hergen
last_name: Breitzke
- first_name: Gerd
full_name: Buntkowsky, Gerd
last_name: Buntkowsky
- first_name: Ana Guilherme
full_name: Buzanich, Ana Guilherme
last_name: Buzanich
- first_name: Sebastian
full_name: Wohlrab, Sebastian
last_name: Wohlrab
citation:
ama: Kunkel B, Seeburg D, Kabelitz A, et al. Highly productive V/Zn-SiO2 catalysts
for the selective oxidation of methane. Catalysis Today. 2024;432:114643.
doi:10.1016/j.cattod.2024.114643
apa: Kunkel, B., Seeburg, D., Kabelitz, A., Witte, S., Gutmann, T., Breitzke, H.,
Buntkowsky, G., Buzanich, A. G., & Wohlrab, S. (2024). Highly productive V/Zn-SiO2
catalysts for the selective oxidation of methane. Catalysis Today, 432,
114643. https://doi.org/10.1016/j.cattod.2024.114643
bibtex: '@article{Kunkel_Seeburg_Kabelitz_Witte_Gutmann_Breitzke_Buntkowsky_Buzanich_Wohlrab_2024,
title={Highly productive V/Zn-SiO2 catalysts for the selective oxidation of methane},
volume={432}, DOI={10.1016/j.cattod.2024.114643},
journal={Catalysis Today}, author={Kunkel, Benny and Seeburg, Dominik and Kabelitz,
Anke and Witte, Steffen and Gutmann, Torsten and Breitzke, Hergen and Buntkowsky,
Gerd and Buzanich, Ana Guilherme and Wohlrab, Sebastian}, year={2024}, pages={114643}
}'
chicago: 'Kunkel, Benny, Dominik Seeburg, Anke Kabelitz, Steffen Witte, Torsten
Gutmann, Hergen Breitzke, Gerd Buntkowsky, Ana Guilherme Buzanich, and Sebastian
Wohlrab. “Highly Productive V/Zn-SiO2 Catalysts for the Selective Oxidation of
Methane.” Catalysis Today 432 (2024): 114643. https://doi.org/10.1016/j.cattod.2024.114643.'
ieee: 'B. Kunkel et al., “Highly productive V/Zn-SiO2 catalysts for the selective
oxidation of methane,” Catalysis Today, vol. 432, p. 114643, 2024, doi:
10.1016/j.cattod.2024.114643.'
mla: Kunkel, Benny, et al. “Highly Productive V/Zn-SiO2 Catalysts for the Selective
Oxidation of Methane.” Catalysis Today, vol. 432, 2024, p. 114643, doi:10.1016/j.cattod.2024.114643.
short: B. Kunkel, D. Seeburg, A. Kabelitz, S. Witte, T. Gutmann, H. Breitzke, G.
Buntkowsky, A.G. Buzanich, S. Wohlrab, Catalysis Today 432 (2024) 114643.
date_created: 2026-02-07T15:53:56Z
date_updated: 2026-02-17T16:15:41Z
doi: 10.1016/j.cattod.2024.114643
extern: '1'
intvolume: ' 432'
keyword:
- Formaldehyde
- Local coordination
- SBA-15
- Vanadium oxo species
- XANES
- Zinc doped silica
language:
- iso: eng
page: '114643'
publication: Catalysis Today
status: public
title: Highly productive V/Zn-SiO2 catalysts for the selective oxidation of methane
type: journal_article
user_id: '100715'
volume: 432
year: '2024'
...
---
_id: '63991'
abstract:
- lang: eng
text: A series of 1 and 2 nm sized platinum nanoparticles (Pt-NPs) deposited on
different support materials, namely, gamma-alumina (gamma-Al2O3), titanium dioxide
(TiO2), silicon dioxide (SiO2) and fumed silica are investigated by solid-state
NMR and dynamic nuclear polarization enhanced NMR spectroscopy (DNP). DNP signal
enhancement factors up to 170 enable gaining deeper insight into the surface chemistry
of Pt-NPs. Carbon monoxide is used as a probe molecule to analyze the adsorption
process and the surface chemistry on the supported Pt-NPs. The studied systems
show significant catalytic activity in carbon monoxide oxidation on their surface
at room temperature. The underlying catalytic mechanism is the water-gas shift
reaction. In the case of alumina as the support the produced CO2 reacts with the
surface to form carbonate, which is revealed by solid-state NMR. A similar carbonate
formation is also observed when physical mixtures of neat alumina with silica,
fumed silica and titania supported Pt-NPs are studied.
author:
- first_name: V.
full_name: Klimavicius, V.
last_name: Klimavicius
- first_name: S.
full_name: Neumann, S.
last_name: Neumann
- first_name: S.
full_name: Kunz, S.
last_name: Kunz
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
citation:
ama: Klimavicius V, Neumann S, Kunz S, Gutmann T, Buntkowsky G. Room temperature
CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state NMR
and DNP spectroscopy. Catalysis Science & Technology. 2019;9(14):3743–3752.
doi:10.1039/c9cy00684b
apa: Klimavicius, V., Neumann, S., Kunz, S., Gutmann, T., & Buntkowsky, G. (2019).
Room temperature CO oxidation catalysed by supported Pt nanoparticles revealed
by solid-state NMR and DNP spectroscopy. Catalysis Science & Technology,
9(14), 3743–3752. https://doi.org/10.1039/c9cy00684b
bibtex: '@article{Klimavicius_Neumann_Kunz_Gutmann_Buntkowsky_2019, title={Room
temperature CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state
NMR and DNP spectroscopy}, volume={9}, DOI={10.1039/c9cy00684b},
number={14}, journal={Catalysis Science & Technology}, author={Klimavicius,
V. and Neumann, S. and Kunz, S. and Gutmann, Torsten and Buntkowsky, G.}, year={2019},
pages={3743–3752} }'
chicago: 'Klimavicius, V., S. Neumann, S. Kunz, Torsten Gutmann, and G. Buntkowsky.
“Room Temperature CO Oxidation Catalysed by Supported Pt Nanoparticles Revealed
by Solid-State NMR and DNP Spectroscopy.” Catalysis Science & Technology
9, no. 14 (2019): 3743–3752. https://doi.org/10.1039/c9cy00684b.'
ieee: 'V. Klimavicius, S. Neumann, S. Kunz, T. Gutmann, and G. Buntkowsky, “Room
temperature CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state
NMR and DNP spectroscopy,” Catalysis Science & Technology, vol. 9,
no. 14, pp. 3743–3752, 2019, doi: 10.1039/c9cy00684b.'
mla: Klimavicius, V., et al. “Room Temperature CO Oxidation Catalysed by Supported
Pt Nanoparticles Revealed by Solid-State NMR and DNP Spectroscopy.” Catalysis
Science & Technology, vol. 9, no. 14, 2019, pp. 3743–3752, doi:10.1039/c9cy00684b.
short: V. Klimavicius, S. Neumann, S. Kunz, T. Gutmann, G. Buntkowsky, Catalysis
Science & Technology 9 (2019) 3743–3752.
date_created: 2026-02-07T15:47:21Z
date_updated: 2026-02-17T16:16:33Z
doi: 10.1039/c9cy00684b
extern: '1'
intvolume: ' 9'
issue: '14'
keyword:
- Chemistry
- gamma-alumina
- hydrogenation
- silica
- c-13
- interactions
- metal-catalysts
- particle-size
- platinum nanoparticles
- sites
- surface
- water-gas shift
language:
- iso: eng
page: 3743–3752
publication: Catalysis Science & Technology
publication_identifier:
issn:
- 2044-4753
status: public
title: Room temperature CO oxidation catalysed by supported Pt nanoparticles revealed
by solid-state NMR and DNP spectroscopy
type: journal_article
user_id: '100715'
volume: 9
year: '2019'
...
---
_id: '6543'
abstract:
- lang: eng
text: Up to 400 mW of near-IR (1370-1500 nm) femtosecond pulses are generated from
an optical parametric amplifier directly driven by a Yb:fiber oscillator delivering
100\&\#x00A0;fs pulses at 1036 nm. The process is seeded by a stable supercontinuum
obtained from a photonic crystal fiber. We use a single pass through a 3 mm, magnesium
oxide-doped, periodically poled LiNbO3 downconversion crystal to produce a near-IR
pulse train with a remarkable power stability of 1.4 % (RMS) during one hour.
Tuning is achieved by the temperature and the poling period of the nonlinear crystal.
article_type: original
author:
- first_name: J.
full_name: Mundry, J.
last_name: Mundry
- first_name: J.
full_name: Lohrenz, J.
last_name: Lohrenz
- first_name: M.
full_name: Betz, M.
last_name: Betz
citation:
ama: Mundry J, Lohrenz J, Betz M. Tunable femtosecond near-IR source by pumping
an OPA directly with a 90 MHz Yb:fiber source. Applied Optics. 2017;56(11):3104-3108.
doi:10.1364/AO.56.003104
apa: Mundry, J., Lohrenz, J., & Betz, M. (2017). Tunable femtosecond near-IR
source by pumping an OPA directly with a 90 MHz Yb:fiber source. Applied Optics,
56(11), 3104–3108. https://doi.org/10.1364/AO.56.003104
bibtex: '@article{Mundry_Lohrenz_Betz_2017, title={Tunable femtosecond near-IR source
by pumping an OPA directly with a 90 MHz Yb:fiber source}, volume={56}, DOI={10.1364/AO.56.003104}, number={11},
journal={Applied Optics}, publisher={OSA}, author={Mundry, J. and Lohrenz, J.
and Betz, M.}, year={2017}, pages={3104–3108} }'
chicago: 'Mundry, J., J. Lohrenz, and M. Betz. “Tunable Femtosecond Near-IR Source
by Pumping an OPA Directly with a 90 MHz Yb:Fiber Source.” Applied Optics
56, no. 11 (2017): 3104–8. https://doi.org/10.1364/AO.56.003104.'
ieee: J. Mundry, J. Lohrenz, and M. Betz, “Tunable femtosecond near-IR source by
pumping an OPA directly with a 90 MHz Yb:fiber source,” Applied Optics,
vol. 56, no. 11, pp. 3104–3108, 2017.
mla: Mundry, J., et al. “Tunable Femtosecond Near-IR Source by Pumping an OPA Directly
with a 90 MHz Yb:Fiber Source.” Applied Optics, vol. 56, no. 11, OSA, 2017,
pp. 3104–08, doi:10.1364/AO.56.003104.
short: J. Mundry, J. Lohrenz, M. Betz, Applied Optics 56 (2017) 3104–3108.
date_created: 2019-01-09T10:06:44Z
date_updated: 2022-01-06T07:03:11Z
department:
- _id: '230'
doi: 10.1364/AO.56.003104
intvolume: ' 56'
issue: '11'
keyword:
- Infrared and far-infrared lasers
- Ultrafast lasers
- Nonlinear optics
- parametric processes
- Parametric oscillators and amplifiers
- Femtosecond pulses
- Fiber lasers
- Fused silica
- Laser systems
- Photonic crystal fibers
- Pulse propagation
language:
- iso: eng
page: 3104-3108
project:
- _id: '53'
name: TRR 142
- _id: '54'
name: TRR 142 - Project Area A
- _id: '58'
name: TRR 142 - Subproject A1
publication: Applied Optics
publisher: OSA
status: public
title: Tunable femtosecond near-IR source by pumping an OPA directly with a 90 MHz
Yb:fiber source
type: journal_article
user_id: '49428'
volume: 56
year: '2017'
...
---
_id: '63956'
abstract:
- lang: eng
text: The synthesis of novel robust and stable iridium-based immobilized catalysts
on silica-polymer hybrid materials (Si-PB-Ir) is described. These catalysts are
characterized by a combination of 1D P-31 CP-MAS and 2D P-31-H-1 HETCOR and J-resolved
multinuclear solid state NMR experiments. Different binding situations such as
singly and multiply coordinated phosphines are identified. Density functional
theory (DFT) calculations are performed to corroborate the interpretation of the
experimental NMR data, in order to propose a structural model of the heterogenized
catalysts. Finally, the catalytic activity of the Si-PB-Ir catalysts is investigated
for the hydrogenation of styrene employing para-enriched hydrogen gas.
author:
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: S.
full_name: Alkhagani, S.
last_name: Alkhagani
- first_name: N.
full_name: Rothermel, N.
last_name: Rothermel
- first_name: H. H.
full_name: Limbach, H. H.
last_name: Limbach
- first_name: H.
full_name: Breitzke, H.
last_name: Breitzke
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
citation:
ama: Gutmann T, Alkhagani S, Rothermel N, Limbach HH, Breitzke H, Buntkowsky G.
P-31-Solid-State NMR Characterization and Catalytic Hydrogenation Tests of Novel
heterogenized Iridium-Catalysts. Zeitschrift Fur Physikalische Chemie-International
Journal of Research in Physical Chemistry & Chemical Physics. 2017;231(3):653–669.
doi:10.1515/zpch-2016-0837
apa: Gutmann, T., Alkhagani, S., Rothermel, N., Limbach, H. H., Breitzke, H., &
Buntkowsky, G. (2017). P-31-Solid-State NMR Characterization and Catalytic Hydrogenation
Tests of Novel heterogenized Iridium-Catalysts. Zeitschrift Fur Physikalische
Chemie-International Journal of Research in Physical Chemistry & Chemical
Physics, 231(3), 653–669. https://doi.org/10.1515/zpch-2016-0837
bibtex: '@article{Gutmann_Alkhagani_Rothermel_Limbach_Breitzke_Buntkowsky_2017,
title={P-31-Solid-State NMR Characterization and Catalytic Hydrogenation Tests
of Novel heterogenized Iridium-Catalysts}, volume={231}, DOI={10.1515/zpch-2016-0837},
number={3}, journal={Zeitschrift Fur Physikalische Chemie-International Journal
of Research in Physical Chemistry & Chemical Physics}, author={Gutmann, Torsten
and Alkhagani, S. and Rothermel, N. and Limbach, H. H. and Breitzke, H. and Buntkowsky,
G.}, year={2017}, pages={653–669} }'
chicago: 'Gutmann, Torsten, S. Alkhagani, N. Rothermel, H. H. Limbach, H. Breitzke,
and G. Buntkowsky. “P-31-Solid-State NMR Characterization and Catalytic Hydrogenation
Tests of Novel Heterogenized Iridium-Catalysts.” Zeitschrift Fur Physikalische
Chemie-International Journal of Research in Physical Chemistry & Chemical
Physics 231, no. 3 (2017): 653–669. https://doi.org/10.1515/zpch-2016-0837.'
ieee: 'T. Gutmann, S. Alkhagani, N. Rothermel, H. H. Limbach, H. Breitzke, and G.
Buntkowsky, “P-31-Solid-State NMR Characterization and Catalytic Hydrogenation
Tests of Novel heterogenized Iridium-Catalysts,” Zeitschrift Fur Physikalische
Chemie-International Journal of Research in Physical Chemistry & Chemical
Physics, vol. 231, no. 3, pp. 653–669, 2017, doi: 10.1515/zpch-2016-0837.'
mla: Gutmann, Torsten, et al. “P-31-Solid-State NMR Characterization and Catalytic
Hydrogenation Tests of Novel Heterogenized Iridium-Catalysts.” Zeitschrift
Fur Physikalische Chemie-International Journal of Research in Physical Chemistry
& Chemical Physics, vol. 231, no. 3, 2017, pp. 653–669, doi:10.1515/zpch-2016-0837.
short: T. Gutmann, S. Alkhagani, N. Rothermel, H.H. Limbach, H. Breitzke, G. Buntkowsky,
Zeitschrift Fur Physikalische Chemie-International Journal of Research in Physical
Chemistry & Chemical Physics 231 (2017) 653–669.
date_created: 2026-02-07T15:35:41Z
date_updated: 2026-02-17T16:18:04Z
doi: 10.1515/zpch-2016-0837
extern: '1'
intvolume: ' 231'
issue: '3'
keyword:
- Chemistry
- dynamic nuclear-polarization
- solid-state nmr
- DFT
- heterogeneous catalysis
- hydrido complexes
- hydrogenation
- immobilized catalyst
- inorganic hybrid
- iridium
- materials
- mesoporous
- molecular-orbital methods
- PHIP
- phosphine complexes
- reusable catalysts
- silica
- solid-state-NMR
- wilkinsons catalyst
language:
- iso: eng
page: 653–669
publication: Zeitschrift Fur Physikalische Chemie-International Journal of Research
in Physical Chemistry & Chemical Physics
publication_identifier:
issn:
- 0942-9352
status: public
title: P-31-Solid-State NMR Characterization and Catalytic Hydrogenation Tests of
Novel heterogenized Iridium-Catalysts
type: journal_article
user_id: '100715'
volume: 231
year: '2017'
...
---
_id: '64039'
abstract:
- lang: eng
text: The preparation of hierarchical and sophisticated particle architectures for
mimicking structural colors known from nature still remains a challenge. In this
study, the preparation of novel opal and double-inverse opal films based on thermally
treated metallopolymer core particles with a silica shell is described. Thermal
treatment leads to the formation of magnetic nanorattle-type particles. The main
challenge of artificial particles is to ensure sufficient dispersibility after
several synthetic steps. Especially silica particles providing surface hydroxyl
groups tend to sinter at high temperatures leading to agglomeration. We present
the introduction of trimethyl ethoxy silane (TMES) as an excellent functionalization
reagent as the key reaction step. The necessity and success of functionalization
are investigated by transmission electron microscopy (TEM) and zeta potential
measurements. Importantly, solid state NMR techniques are employed to gain deeper
insights into the chemical structure of the surface-attached reagent. Finally,
by this convenient functionalization the preparation of elastomeric opal films
and double-inverse opal films is proven successful revealing excellent optical
film properties. Moreover, magnetic properties of these novel films are investigated
by using magnetic force microscopy (MFM). The herein established route is expected
to pave the way for the preparation of a variety of advanced and stimuli-responsive
optical materials.
author:
- first_name: D.
full_name: Scheid, D.
last_name: Scheid
- first_name: D.
full_name: Stock, D.
last_name: Stock
- first_name: T.
full_name: Winter, T.
last_name: Winter
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: C.
full_name: Dietz, C.
last_name: Dietz
- first_name: M.
full_name: Gallei, M.
last_name: Gallei
citation:
ama: Scheid D, Stock D, Winter T, Gutmann T, Dietz C, Gallei M. The pivotal step
of nanoparticle functionalization for the preparation of functional and magnetic
hybrid opal films. Journal of Materials Chemistry C. 2016;4(11):2187–2196.
doi:10.1039/c5tc04388c
apa: Scheid, D., Stock, D., Winter, T., Gutmann, T., Dietz, C., & Gallei, M.
(2016). The pivotal step of nanoparticle functionalization for the preparation
of functional and magnetic hybrid opal films. Journal of Materials Chemistry
C, 4(11), 2187–2196. https://doi.org/10.1039/c5tc04388c
bibtex: '@article{Scheid_Stock_Winter_Gutmann_Dietz_Gallei_2016, title={The pivotal
step of nanoparticle functionalization for the preparation of functional and magnetic
hybrid opal films}, volume={4}, DOI={10.1039/c5tc04388c},
number={11}, journal={Journal of Materials Chemistry C}, author={Scheid, D. and
Stock, D. and Winter, T. and Gutmann, Torsten and Dietz, C. and Gallei, M.}, year={2016},
pages={2187–2196} }'
chicago: 'Scheid, D., D. Stock, T. Winter, Torsten Gutmann, C. Dietz, and M. Gallei.
“The Pivotal Step of Nanoparticle Functionalization for the Preparation of Functional
and Magnetic Hybrid Opal Films.” Journal of Materials Chemistry C 4, no.
11 (2016): 2187–2196. https://doi.org/10.1039/c5tc04388c.'
ieee: 'D. Scheid, D. Stock, T. Winter, T. Gutmann, C. Dietz, and M. Gallei, “The
pivotal step of nanoparticle functionalization for the preparation of functional
and magnetic hybrid opal films,” Journal of Materials Chemistry C, vol.
4, no. 11, pp. 2187–2196, 2016, doi: 10.1039/c5tc04388c.'
mla: Scheid, D., et al. “The Pivotal Step of Nanoparticle Functionalization for
the Preparation of Functional and Magnetic Hybrid Opal Films.” Journal of Materials
Chemistry C, vol. 4, no. 11, 2016, pp. 2187–2196, doi:10.1039/c5tc04388c.
short: D. Scheid, D. Stock, T. Winter, T. Gutmann, C. Dietz, M. Gallei, Journal
of Materials Chemistry C 4 (2016) 2187–2196.
date_created: 2026-02-07T16:09:09Z
date_updated: 2026-02-17T16:13:25Z
doi: 10.1039/c5tc04388c
extern: '1'
intvolume: ' 4'
issue: '11'
keyword:
- Materials Science
- silica
- Physics
- nmr
- colloidal photonic crystals
- light
- polymerization
- solids
- structural color
- thermo
language:
- iso: eng
page: 2187–2196
publication: Journal of Materials Chemistry C
publication_identifier:
issn:
- 2050-7526
status: public
title: The pivotal step of nanoparticle functionalization for the preparation of functional
and magnetic hybrid opal films
type: journal_article
user_id: '100715'
volume: 4
year: '2016'
...