Joanna Łojewska

Joanna Łojewska
Jagiellonian University | UJ · Faculty of Chemistry

About

17
Publications
2,571
Reads
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373
Citations
Citations since 2016
11 Research Items
340 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080

Publications

Publications (17)
Article
This study focuses on the temporal stability of insulation paper used in power transformers and intends to provide reliable and comprehensive estimators for the assessment of paper degradation state. To achieve the objectives artificially aged model papers were investigated along with power transformers insulation papers, by means of Size Exclusion...
Article
Full-text available
Design of the catalytic properties and structure of zeolite materials play a key role in efficient transformation of biomass to sustainable chemicals. In the present study, we have designed theoretical and experimental approach for the production of acrylic acid (AA) from lactic acid (LA) over zeolite catalysts. Various BEA zeolites modified with m...
Article
Full-text available
Metal foams are considered as promising catalyst carriers due to their high porosity, large specific surface area, and satisfactory thermal and mechanical stability. The study presents heat transfer and pressure drop experiments performed for seven foams of different pore densities made from diverse metals. Mass transfer characteristics are derived...
Article
The aim of this study was to examine efficacy of different fractions of TEMPO-oxidized cellulose nanocrystals (TOCNs) as a reducing and capping agent of silver nanoparticles (AgNPs). Silver nanoparticles were prepared by thermal treatment of AgNO 3 in aqueous suspensions of TOCN fractions. Three different nanocomposite materials based on different...
Chapter
This chapter intends to present the classical and modern techniques that are used for in situ characterisation of catalytic materials. Determination of the structure of the catalyst presents three main problems: (1) heterogeneous catalysis phenomena are limited to the outer surface of the material where the molecules adsorb and react, and for this...
Article
A combined study of crystallinity index (CI), degree of polymerisation (DP) and thermal stability of cellulose was carried out for monitoring the effect of ball-milling. DP and CI are two fundamental quantities that describe the physico-chemical behaviour of cellulose. Milling is a common strategy to reduce cellulose crystallinity. In this work, fo...
Article
Innovative structured catalyst supports, like solid foams, wire gauzes and short-channel structures are considered in methane catalytic combustion. For comparison, classical supports such as packed beds and monoliths are also taken into account. Moreover, two catalysts, displaying “fast” and “slow” kinetics, are examined. The performance efficiency...
Patent
Przedmiotem wynalazku jest materiał nanokompozytowy, sposób jego wytwarzania oraz zastosowanie. Bardziej szczegółowo rozwiązanie dotyczy: opakowaniowego materiału nanokompozytowego.
Article
This study is an approach to resolve the mechanism of methane catalytic combustion over a series of palladium and cobalt palladium and ceria-doped catalysts supported on γ-Al2O3. The first and most important question addressed is whether methane adsorbs on the surface of the catalyst. Another task was to determine the stable intermediate products o...
Article
Experimental and numerical studies were conducted on flow friction and heat transfer in short channels of triangular and sinusoidal cross-section assuming developing laminar air flow. Reynolds numbers range of 13–2880 was examined. Spatial distribution of the gas velocity, as well as the rates of local heat transfer between channel walls and gas st...
Article
A question arises whether the kinetic parameters derived from the Arrhenius equation presented in the literature in fact reflect intrinsic kinetics or are influenced by diffusional effects. It is commonly accepted that diffusion can not only influence (reduce) the reaction rate but also change the observed kinetic constants and reaction order. In t...
Article
In this study a part of research where artificially aged model samples were used as a guideline to the mechanism of degradation is presented. In previous work Bombyx Mori silk samples were exposed to various environments such as different oxygen, water vapour and volatile organic products content, all at the temperature of 150°C [11]. Based on thos...
Article
Three types of polycrystalline diamond composites (PCDs) were studied. The first material was sintered using the mixture containing 80 wt % diamond, 15 wt % of Ti-Si-C powder (mixture of 47.1 wt % Ti3SiC2 and TiSi2, TiC and SiC, from self-propagating high-temperature synthesis) and 5 wt % nanometric Ti(CN) powders. The second material was prepared...
Article
The catalyst (spinel CO3O4) was deposited by plasma technique. The kinetic studies were performed in a gradient-less reactor. The plug-flow reactor model was applied. Exps. were performed for catalytic combustion of n-hexane (temp, up to 560°C, gas stream up to 10 m 3/h STP). The validation showed max. error of 12% between model and experiment.
Article
A structured reactor was built from stacked catalytic knitted wire gauzes. The cobalt oxide catalyst was deposited on the wire gauze surface using the plasma enhanced metal-organic chemical vapour deposition method. The Raman scattering, electron diffraction and photoelectron emission analyses of the catalyst surface evidenced the formation of a co...
Article
The study is devoted to the evaluation of the cobalt and copper doped cobalt catalysts deposited on the structured carriers for VOC combustion. The catalysts have been tested in n-hexane oxidation in the jet-stirred gradientless reactor at various temperatures. As the reactor has occurred not to provide sufficient mixing conditions a model has been...

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