Kinga Łuczka, Barbara Grzmil, Beata Michalkiewicz, Krzysztof Kowalczyk,
Studies on obtaining of aluminium phosphates modified with ammonium, calcium and molybdenum were implemented. Reagent grade substrates (NH4)2HPO4, CaCO3, (NH4)6Mo7O24·4H2O, aqueous ammonia, and amorphous Al(OH)3 were prepared and used in the experiments. An influence of process parameters, i.e. reaction time (60 ± 30 min) and total salt concentration (50 ± 10 wt%) on the phase composition and product properties was determined. Statistical software STATISTICA 10 for planning and evaluation of the experiments ...
Tópico(s): Chemical Synthesis and Characterization
2014 - Elsevier BV | Journal of Industrial and Engineering Chemistry
Wojciech Kukułka, Krzysztof Cendrowski, Beata Michalkiewicz, Ewa Mijowska,
In our study we prepared MOF-5 derived carbon to reveal the thermodynamics of CO2 absorption processes in great detail. Porous carbon material was prepared from a metal-organic framework (MOF-5) via carbonization at 1000 °C. The obtained structure consists only of carbon and exhibits a BET specific surface area, total pore volume and micropore volume of 1884 m2 g-1, 1.84 cm3 g-1 and 0.59 cm3 g-1, respectively. Structural analysis allowed the assumption that this material is an ideal candidate for ...
Tópico(s): Covalent Organic Framework Applications
2019 - Royal Society of Chemistry | RSC Advances
Xiaoze Shi, Jiang Gong, Krzysztof Kierzek, Beata Michalkiewicz, Shuai Zhang, Paul K. Chu, Xuecheng Chen, Tao Tang, Ewa Mijowska,
Nitrogen-doped nanoporous carbons were prepared, capturing CO 2 of 10 mmol g −1 at 45 bar and achieving a reversible capacity of 762 mA h g −1 .
Tópico(s): Supercapacitor Materials and Fabrication
2019 - Royal Society of Chemistry | New Journal of Chemistry
Martyna Baca, Krzysztof Cendrowski, Paweł Banach, Beata Michalkiewicz, Ewa Mijowska, Ryszard J. Kaleńczuk, Beata Zielińska,
A disordered mesoporous hollow carbon spheres were decorated with Pd nanoparticles and their H2 sorption performance was examined at 40 °C and up to 45 bar. It was found that Pd supported carbon spheres exhibited enhanced H2 uptake capacity in comparison to the pristine material, despite the fact that their surface area and porosity decreased after Pd incorporation. The effect of the amount of Pd loading on the hydrogen storage abilities of the samples was studied. The results revealed that the H2 ...
Tópico(s): Hybrid Renewable Energy Systems
2017 - Elsevier BV | International Journal of Hydrogen Energy
Monika Jarosińska, Krzysztof Lubkowski, Jacek G. Sośnicki, Beata Michalkiewicz,
Tópico(s): Phase Equilibria and Thermodynamics
2008 - Springer Science+Business Media | Catalysis Letters
Krzysztof Lubkowski, W. Arabczyk, Barbara Grzmil, Beata Michalkiewicz, A. Pattek‐Janczyk,
A process of ammonia iron catalyst passivation and oxidation with oxygen and water vapour was investigated by thermogravimetry, Mössbauer spectroscopy and X-ray diffraction. The optimal passivation conditions (T ≤ 100 °C, pO2≤0.0013bar) have been proposed. The thickness (0.9–1.1 nm) and the structure (paramagnetic Fe2O3) of a protective, passive layer have been determined. It was found that oxidation of a reduced catalyst with pure oxygen (pO2=1bar) and water vapour (pH2O=0.023bar) did not lead to its passivation. ...
Tópico(s): Nanomaterials for catalytic reactions
2007 - Elsevier BV | Applied Catalysis A General
Karolina Glonek, Agnieszka Wróblewska, Edyta Makuch, Bogdan Ulejczyk, Krzysztof Krawczyk, Rafał J. Wróbel, Zvi C. Koren, Beata Michalkiewicz,
The waste from industrial fruits processing is utilized for the extraction of limonene, a renewable terpene biomass compound obtained from orange peels. This was followed by limonene oxidation, which produces highly useful oxygenated derivatives (carveol, and perillyl alcohol, 1,2-epoxylimonene and its diol). New catalysts were obtained by treating relatively inexpensive commercially available EuroPh and FPV activated carbons with plasma. These catalysts were characterized by the following instrumental ...
Tópico(s): Porphyrin and Phthalocyanine Chemistry
2017 - Elsevier BV | Applied Surface Science
Martyna Baca, Krzysztof Cendrowski, Wojciech Kukułka, Grzegorz Bazarko, Dariusz Moszyński, Beata Michalkiewicz, Ryszard J. Kaleńczuk, Beata Zielińska,
Comprehensive study to evaluate the ability of hydrogen uptake by disordered mesoporous hollow carbon spheres doped witch metal such as Pt, Pd or Pt/Pd was conducted. They were synthesized facilely using sonication and then calcination process under vacuum at the temperature of 550 °C. The effect on hydrogen sorption at neat-ambient conditions (40 °C, up to 45 bar) was thoroughly analyzed. The results clearly revealed that metal functionalization has a significant impact on the hydrogen storage capacity ...
Tópico(s): Catalytic Processes in Materials Science
2018 - Multidisciplinary Digital Publishing Institute | Nanomaterials
Wojciech Kukułka, Krzysztof Cendrowski, Beata Michalkiewicz, Ewa Mijowska,
Correction for ‘MOF-5 derived carbon as material for CO 2 absorption’ by Wojciech Kukulka et al. , RSC Adv. , 2019, 9 , 18527–18537.
Tópico(s): Carbon Dioxide Capture Technologies
2019 - Royal Society of Chemistry | RSC Advances
Mariusz Malko, Adrian Krzysztof Antosik, Agnieszka Wróblewska, Zbigniew Czech, Katarzyna Wilpiszewska, Piotr Miądlicki, Beata Michalkiewicz,
Abstract In our studies montmorillonite (MMT) was used as the heterogeneous, natural catalyst. This material was previously prepared by bentonite purification with help of the sedimentation method. The obtained catalyst was characterized by: XRD, SEM, BET and EDX. Catalytic tests with montmorillonite as the catalyst were performed with the natural terpene – R-(+)-limonene. This compound was oxidized with hydrogen peroxide and, moreover, in the separate process it was also isomerized. As the main products ...
Tópico(s): Porphyrin and Phthalocyanine Chemistry
2017 - De Gruyter Open | Polish Journal of Chemical Technology
Joanna Siemak, Bogdan Ulejczyk, G. Mikołajczak, Jakub Pęksiński, Joanna Sreńscek-Nazzal, Michał Młotek, Krzysztof Krawczyk, Beata Michalkiewicz,
The commercially available activated carbon was modified using barrier and spark discharge low-temperature nitrogen plasma treatment. The samples were investigated using nitrogen sorption at a temperature of −196 °C, XRD, SEM, and FTIR methods, and elemental analysis. The nitrogen content on the surface was increased, but other properties, such as specific surface area, total pore volume, pseudocrystallite height, and pseudocrystallite width, remained unchanged. The activated carbons after nitrogen ...
Tópico(s): Plasma Applications and Diagnostics
2024 - Multidisciplinary Digital Publishing Institute | Applied Sciences