Ewa Nowicka

Ewa Nowicka
Technische Universität Berlin | TUB · Department of Chemistry

PhD Chemistry

About

45
Publications
14,281
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,090
Citations
Citations since 2016
30 Research Items
899 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Ewa Nowicka currently works at the Department of Chemistry, Technische Universität Berlin.
Additional affiliations
August 2016 - present
Technische Universität Berlin
Position
  • Fellow
August 2016 - present
Cardiff University
Position
  • Honorary Research Associate
June 2012 - July 2016
Cardiff University
Position
  • Research Assistant
Education
November 2009 - December 2011
Cardiff University
Field of study
  • Chemistry, Catalysis
September 2005 - March 2006
Universität Bremen
Field of study
  • Environmental Chemistry, Marine Chemistry
October 2002 - June 2007
Adam Mickiewicz University
Field of study
  • Environmental Chemistry

Publications

Publications (45)
Article
Heavy crude oil fractions which form the residues from fractional distillation are a significant proportion of current hydrocarbon reserves. However, processing residues for use as chemicals or fuels is hampered...
Article
Full-text available
A series of layered birnessite (AMn4O8) catalysts containing different alkali cations (A = H+, Li+, Na+, K+, Rb+, or Cs+) was synthesized. The materials were thoroughly characterized using X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, Raman spectroscopy, specific surface area analysis, work function, thermogravimetry/diff...
Article
Full-text available
Pd–Zn/TiO2 catalysts containing 1 wt% total metal loading, but with different Pd to Zn ratios, were prepared using a modified impregnation method and tested in the solvent-free aerobic oxidation of benzyl alcohol. The catalyst with the higher Pd content exhibited an enhanced activity for benzyl alcohol oxidation. However, the selectivity to benzald...
Article
The catalytic activity of Pd/γAl2O3 for N2O decomposition was found to be highly dependent on the preparation methodology and the number of reaction cycles. Chloride species on the surface of a 2.6 wt. % Pd-Al2O3 catalyst prepared by wet impregnation were identified as inhibiting the activity. Multiple reaction cycles were shown to remove these spe...
Article
A series of catalysts based on cryptomelane (AMn8O16) containing different alkali cations (A = H⁺, Li⁺, Na⁺, K⁺ or Rb⁺) were synthesized, characterized and tested for their soot and VOC combustion activity. The K-OMS material with the lowest work function and highest catalytic activity was then functionalized with 2 wt% noble metal (Ag, Au or Pt) a...
Article
Full-text available
Gold supported on ceria-zirconia is one of the most active low temperature water-gas shift catalysts reported to date but rapid deactivation occurs under reaction conditions. In this study, ceria-titania was evaluated as an alternative catalyst support. Materials of different Ce:Ti compositions were synthesized using a sol-gel methodology and gold...
Article
Full-text available
The influence of Fe speciation on the decomposition rates of N2O over Fe–ZSM-5 catalysts prepared by Chemical Vapour Impregnation were investigated. Various weight loadings of Fe–ZSM-5 catalysts were prepared from the parent zeolite H-ZSM-5 with a Si:Al ratio of 23 or 30. The effect of Si:Al ratio and Fe weight loading was initially investigated be...
Article
One major drawback in the production of clean hydrogen from methanol is the formation of carbon monoxide which can subsequently act as a poison in fuel cell applications. Here we report on PdZn/ZnO catalysts developed for the methanol steam reforming reaction which have a high selectivity towards carbon dioxide. The impregnation-based method we emp...
Article
Full-text available
In this study, active cobalt-based catalysts are reported for the solvent-free aerobic epoxidation of 1-decene as a non-noble metal, alternative to the conventionally used gold catalyst. No sacrificial reductant is applied and air is used as primary oxidant at ambient pressure. The influence of different radical initiators and the product distribut...
Article
Full-text available
The reaction mechanism of ethane and ethene oxidation was studied under the OCM reaction conditions over MnxOy–Na2WO4/SiO2. The consecutive reaction of C2 components is observed to be the main route to the formation of COX under the applied reaction conditions here. The homogeneous or heterogeneous nature of these unselective reactions was investig...
Article
Ruthenium ion catalyzed oxidation (RICO) of polyaromatic hydrocarbons (PAHs) has been studied in detail using experimental and computational approaches to explore the reaction mechanism. DFT calculations show that regioselectivity in these reactions can be understood in terms of the preservation of aromaticity in the initial formation of a [3+2] me...
Article
Full-text available
Cyclic carbonates are valuable chemicals for the chemical industry and thus, their efficient synthesis is essential. Commonly, cyclic carbonates are synthesised in a two-step process involving the epoxidation of an alkene and a subsequent carboxylation to the cyclic carbonate. To couple both steps into a direct oxidative carboxylation reaction woul...
Article
A mixed oxide support containing Ce, Zr and Al was synthesized using a physical grinding method and applied in the oxidative dehydrogenation of propane using CO2 as the oxidant. The activity of the support was compared with that of fully-formulated catalysts containing palladium. The Pd/CeZrAlOx material exhibited long-term stability and selectivit...
Article
Supported bimetallic nanoparticulate catalysts are an important class of heterogeneous catalysts for many reactions including selective oxidation, hydrogenation/hydrogenolysis, reforming, biomass conversion reactions, and many more. The activity, selectivity, and stability of these catalysts depend on their structural features including particle si...
Article
Full-text available
Gold (Au) on ceria–zirconia is one of the most active catalysts for the low‐temperature water–gas shift reaction (LTS), a key stage of upgrading H2 reformate streams for fuel cells. However, this catalyst rapidly deactivates on‐stream and the deactivation mechanism remains unclear. Using stop–start scanning transmission electron microscopy to follo...
Article
Oxidation of aromatic hydrocarbons with differing numbers of fused aromatic rings (2-5), have been studied in two solvents environments (monophasic and biphasic) using ruthenium ion catalyzed oxidation (RICO). RICO reduces the aromaticity of the polyaromatic core of the molecule in a controlled manner by selective oxidative ring opening. Moreover,...
Article
Gold on ceria-zirconia is an active catalyst for the low-temperature water-gas shift reaction (LTS), a key stage of upgrading H2 reformate streams for fuel cells. However, this catalyst rapidly deactivates and the mechanism remains unclear. Using stop-start scanning transmission electron microscopy (STEM) to follow the exact same area of the sample...
Article
Here we report the synthesis and characterisation of high surface area MgO prepared via the thermal decomposition of various magnesium precursors (MgCO3, Mg(OH)2 and MgC2O4). Bimetallic gold-palladium nanoalloy particles were supported on these MgO materials and were tested as catalysts for the solvent-free selective aerobic oxidation of benzyl alc...
Research
Full-text available
Jako wyznacznik władzy, siły i bogactwa złoto długo było obiektem zainteresowań głównie arystokratów, poszukiwaczy skarbów czy miłośników biżuterii, a nie chemików. Wszystko zmieniło się blisko 40 lat temu, wraz z wybuchem kolejnej-tym razem chemicznej-gorączki złota. Złoto w formie metalicznej, znanej z wyrobów jubilerskich jest nieaktywne chemicz...
Article
Full-text available
We report the one-pot tandem synthesis of 4-(4-methoxyphenyl)butan-2-one directly from 4-methoxybenzyl alcohol and acetone using a multifunctional supported AuPd nanoalloy catalyst. This one pot-synthesis involve dehydrogenation, aldol condensation and hydrogenation of C=C. In this supported AuPd catalyst, the bimetallic sites catalyse the dehydrog...
Article
Full-text available
Carbon dioxide utilisation technology can contribute to the reduction of atmospheric CO2 levels both through its sequestration from flue gases and indirectly by relieving pressure on conventional feedstocks in chemical manufacturing. A promising approach is to employ CO2 to produce valuable cyclic carbonates (CCs) in reaction with suitable epoxides...
Article
Full-text available
Graphitic oxide has potential as a carbocatalyst for a wide range of reactions. Interest in this material has risen enormously due to it being a precursor to graphene via the chemical oxidation of graphite. Despite some studies suggesting that the chosen method of graphite oxidation can influence the physical properties of the graphitic oxide, the...
Article
Full-text available
Highly active and stable bi-metallic Au-Pd catalysts have been extensively studied for several liquid-phase oxidation reac-tions in recent years, but there are far fewer reports on the use of these catalysts for low-temperature gas-phase reactions. Here we initially established the presence of a synergistic effect in a range of bimetallic Au-Pd/CeZ...
Article
Full-text available
Charles Campbell opened the discussion of the paper by Hans-JoachimFreund: If you have a 3D gold particle and it spreads out to be a 2D particle whenyou adsorb CO2, it must gain energy stability. Did you estimate the energy changeof the overall process to do that?
Article
The synthesis and functionalization of imines and amines are key steps in the preparation of many fine chemicals and for pharmaceuticals in particular. Traditionally, metal complexes are used as homogeneous catalysts for these organic transformations. Here we report gold–palladium and ruthenium–palladium nano-alloys supported on TiO2 acting as high...
Article
Full-text available
Supported Pt nanoparticles are shown to be active and selective towards butyraldehyde in the base-free oxidation of n-butanol by O2 in an aqueous phase. The formation of butyric acid as a by-product promoted the leaching of Pt and consequently the activity of the catalysts decreased upon reuse. Characterisation showed that the the degree to which P...
Article
Catalytic strategies for the efficient transformation of abundant sustainable bioderived molecules, such as glycerol, into higher value more useful products is an important research goal. In this study, we demonstrate that atom efficient dehydrative etherification reactions of glycerol with activated alcohols are effectively catalyzed by nanoporous...
Article
Full-text available
The particulate produced by internal combustion engines has a complex composition that includes a large proportion of porous soot within which condensed and adsorbed organic molecules are trapped. However, many studies of the catalytic combustion of particulate are based on the assumption that commercially produced carbon can be used as a reliable...
Article
Full-text available
The sol immobilisation technique, in which a stabilising ligand (such as polyvinyl alcohol or polyvinyl pyridine) can be used to tune metal particle size and composition, has become a valuable method of making supported nanoparticle catalysts. An unfortunate consequence of the stabilising ligand is that often access of reactant molecules to the met...
Article
Full-text available
A quantitative NMR protocol has been developed to study the ruthenium-ion-catalyzed oxidation of a range of alkylated polyaromatics, as reported by S. H. Taylor et al. in their Full Paper on page 4285 ff. RuO4 acts as a very selective catalyst, targeting the oxidation of aromatic carbon in preference to aliphatic carbon in alkyl-substituted polyaro...
Article
Nanoporous alumino- and borosilicate materials, produced using an evaporation-induced self-assembly approach (EISA), efficiently catalyse the Meinwald rearrangement of epoxides in dimethyl carbonate (DMC) to produce the corresponding carbonyl compounds in high yield and excellent selectivity.
Article
Ruthenium-ion-catalyzed oxidation of a range of alkylated polyaromatics has been studied. 2-Ethylnaphthalene was used as a model substrate, and oxidation can be performed in either a conventional biphasic or in a monophasic solvent system. In either case the reaction rates and product selectivity are identical. The reaction products indicate that t...
Article
The base-free selective catalytic oxidation of n-butanol by O2 in an aqueous phase has been studied using Au-Pd bimetallic nanoparticles supported on titania. Au-Pd/TiO2 catalysts were prepared by different methods: wet impregnation, physical mixing, deposition–precipitation and sol immobilisation. The sol immobilisation technique, which used polyv...
Article
Full-text available
The synthesis of stable, supported, bimetallic nanoalloys with controlled size, morphology and composition is of great practical importance. Compared to their monometallic analogues, such materials exhibit remarkable enhancement in functional properties, which can be exploited in various fields including catalysis. Recently, we have reported a simp...
Article
Full-text available
Benzaldehyde readily undergoes autoxidation to form benzoic acid on exposure to air at room temperature. Yet it can be formed in high yield from, for example, benzyl alcohol by oxidation using a variety of procedures and catalysts. Here we report the evidence to resolve this apparent paradox. It is confirmed that benzyl alcohol (and a number of oth...
Article
Full-text available
In the solvent free oxidation of benzyl alcohol, using supported gold-palladium nanoalloys, toluene is often one of major by-products and it is formed by the disproportionation of benzyl alcohol. Gold-palladium catalysts on acidic supports promote both the disproportionation of benzyl alcohol and oxidative dehydrogenation to form benzaldehyde. Basi...
Article
Full-text available
Disproportionation of benzyl alcohol has been identified as the source of toluene formation in the solvent free oxidation of benzyl alcohol using supported gold palladium catalysts. There is a slight increase in the disproportionation reaction, and hence the toluene selectivity, when this reaction is performed in a continuous mode using a micro-pac...
Article
In the solvent-free oxidation of benzyl alcohol to benzaldehyde using supported gold-palladium nanoparticles as catalysts, two pathways have been identified as the sources of the principal product, benzaldehyde. One is the direct catalytic oxidation of benzyl alcohol to benzaldehyde by O(2), whereas the second is the disproportionation of two molec...
Article
We report a pulsed field gradient nuclear magnetic resonance (PFG-NMR) spectroscopic study of the effective diffusivity of alcohols in catalysts comprising gold supported on silica, titania and ceria and gold−palladium alloy nanoparticles supported on titania. These catalysts are shown to be highly active for the selective oxidation of alcohols. Ho...
Article
A key discovery in the last two decades has been the realisation that gold, when prepared as supported nanoparticles, is exceptionally effective as an oxidationcatalyst, particularly for the oxidation of carbon monoxide at sub-ambient temperature but also for a number of organic reactions of synthetic significance. To some extent this observation i...

Network

Cited By

Projects

Projects (5)
Project
Catalysis with the use of Gold (oxidation, coupling, etc...)