Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Urszula Ulkowska"'
Publikováno v:
Molecules, Vol 29, Iss 13, p 3180 (2024)
A new type of catalyst containing magnesium oxide modified with various modifiers ranging from bromine and iodine, to interhalogen compounds, hydrohalogenic acids, and alkyl halides have been prepared using chemical vapor deposition (CVD) and wet imp
Externí odkaz:
https://doaj.org/article/9e44f8c68ba8412cbc55848742941ec6
Autor:
Marek Gliński, Agnieszka Czajka, Urszula Ulkowska, Ewa M. Iwanek (nee Wilczkowska), Dariusz Łomot, Zbigniew Kaszkur
Publikováno v:
Catalysts, Vol 12, Iss 12, p 1595 (2022)
In this study, magnesium nitrate, chloride or sulphate were used in the synthesis of Mg(OH)2, the precursor of MgO. It was found that the counter ion strongly influences the purity of the Mg(OH)2, as well as the specific surface area of the obtained
Externí odkaz:
https://doaj.org/article/97eeb4a1fa2e46d4865110192de35cbc
Autor:
Marek Gliński, Ewa M. Iwanek (nee Wilczkowska), Urszula Ulkowska, Agnieszka Czajka, Zbigniew Kaszkur
Publikováno v:
Catalysts, Vol 11, Iss 11, p 1338 (2021)
The first aim of the research was to synthesize a pure Upsalite, which is an amorphous form of MgCO3, by modifying a procedure described in the literature, so that it would be the precursor of a high-surface, amorphous magnesium oxide. The results in
Externí odkaz:
https://doaj.org/article/27a51ae4929844a9b2f56394011f2e46
Autor:
Paulina Piotrkiewicz, Urszula Ulkowska, Michal Kukielski, Justyna Zygmuntowicz, Ireneusz Szachogluchowicz, Marcin Wachowski, Justyna Tomaszewska, Radosław Żurowski
Publikováno v:
Ceramics International. 48:11678-11695
Autor:
Marek Gliński, Urszula Ulkowska
Publikováno v:
Journal of Flow Chemistry. 11:87-90
We present an experiment offered as a course for undergraduate students at our Faculty. During the laboratory classes, students synthesized 20%wtMnO2/Al2O3catalyst, which is then used in the catalytic reaction—the propionic acid ketonization leadin
Autor:
Osazuwa Osawaru, Sandra Żmuda, Urszula Ulkowska, Marek Marczewski, Monika Aleksandrowicz, Mateusz Rychlik, Ewelina Brzezińska, Marek Gliński, Maja Podlewska
Publikováno v:
Reaction Kinetics, Mechanisms and Catalysis. 126:1081-1096
The measurements of the minimum acid strength (HOmin) required for the initiation of cis-stilbene at 303 K and tert-butylbenzene at 313 K, 323 K and 333 K have enabled the establishment of a much more precise acid strength scale based on test reactio
Publikováno v:
Reaction Kinetics, Mechanisms and Catalysis. 126:199-217
The decomposition of diacetone alcohol to acetone proceeding at 303 K as well as the Cannizzaro transformation of benzaldehyde at 323 K leading to benzyl alcohol, can be regarded as useful test reactions in investigating the basic properties of solid
Autor:
Urszula Ulkowska, Marek Gliński
Publikováno v:
Applied Catalysis A: General. 554:117-124
The vapour-phase catalytic transfer hydrogenation (CTH) of fifteen acyclic α,β-unsaturated carbonyl compounds, i.e. ten aldehydes and five ketones, with ethanol or 2-propanol as hydrogen donors has been studied over pure MgO as the catalyst. The ob
Publikováno v:
Surface and Interface Analysis. 49:945-952
The activity of iodine-modified MgO in transfer hydrogenation of acrolein with alcohols can be significantly higher than that of unmodified MgO. Data from literature and our previous studies indicate that the initial source of a halide influences the
Autor:
Urszula Ulkowska, Marek Gliński
Publikováno v:
Applied Catalysis A: General. 511:131-140
This paper presents the first systematic thermodynamic study of the vapour phase transfer hydrogenation of α,β-unsaturated carbonyl compounds at temperatures: 423.15–723.15 K. Calculations were made for four compounds, namely: acrolein, α-methyl