Zobrazeno 1 - 10
of 175
pro vyhledávání: '"Jerzy Datka"'
Characterisation of Basic Sites on Ga2O3, MgO, and ZnO with Preadsorbed Ethanol and Ammonia—IR Study
Autor:
Jerzy Podobiński, Jerzy Datka
Publikováno v:
Molecules, Vol 29, Iss 13, p 3070 (2024)
The effect of adsorption of ethanol and ammonia on the basicity of Ga2O3, MgO, and ZnO was examined via IR studies of CO2 adsorption. Ethanol reacts with OH groups on Ga2O3, and MgO, forming ethoxyl groups. The substitution of surface hydroxyls by et
Externí odkaz:
https://doaj.org/article/089b5810126e4ba6a9306d50ba2a233d
Autor:
Jerzy Podobiński, Jerzy Datka
Publikováno v:
Molecules, Vol 29, Iss 8, p 1726 (2024)
The adsorption of ethanol and ammonia changes the basic properties of alumina, and new basic sites are created. Ethanol reacts with surface Al-OH groups, forming ethoxy group Al-O-C2H5. The substitution of Al-OH by Al-O-C2H5 increases the negative ch
Externí odkaz:
https://doaj.org/article/07cc000d7978483e878a710c8694c337
Publikováno v:
Molecules, Vol 28, Iss 8, p 3463 (2023)
The reaction of ethanol with surface OH groups on ZrO2, CuO/ZrO2, CuO, Al2O3, Ga2O3, NiO, and SiO2 was studied by IR spectroscopy. The basicity of oxides was followed by CO2 adsorption, and their ability to oxidize was investigated by H2-TPR. It has
Externí odkaz:
https://doaj.org/article/53a715a6d3434929b7b8ea8270c2854a
Publikováno v:
Molecules, Vol 28, Iss 3, p 1251 (2023)
The reaction of ethanol with a surface of CeO2 was studied using IR spectroscopy. In some experiments, CeO2 was pretreated in a vacuum at 820 K which caused a partial reduction. In other experiments, CeO2 was reduced with hydrogen at 770 K. We also u
Externí odkaz:
https://doaj.org/article/91be6f7a86a84d52a9220579145fb709
Publikováno v:
Molecules, Vol 27, Iss 15, p 4790 (2022)
The formation, properties, decomposition and reactions of ethoxy groups on ZrO2, CuO, and CuO/ZrO2 were followed by IR spectroscopy. The reaction of ethanol with terminal Zr-OH groups leads to the formation of monodendate ethoxy groups (type I), wher
Externí odkaz:
https://doaj.org/article/5289674e67964a92967ac64efeade7f5
Publikováno v:
Molecules, Vol 26, Iss 20, p 6261 (2021)
One of the methods of IR studies of the heterogeneity of Si–OH–Al groups in zeolites is the investigation of the frequency shift of the band of free OH bands restored upon the adsorption of ammonia and subsequent desorption at increasing temperat
Externí odkaz:
https://doaj.org/article/b3db9aefee0e46b89472b8f80fe9a268
Autor:
Jerzy Podobiński, Mariusz Gackowski, Grzegorz Mordarski, Katarzyna Samson, Michał Śliwa, Dorota Rutkowska-Zbik, Jerzy Datka
Publikováno v:
Molecules, Vol 26, Iss 15, p 4686 (2021)
The properties of both Cu2+ and Cu+ ions in zeolite CuY were followed with NO and CO as probe molecules. Cu2+ was found to be located in SII, SII*, and SIII sites, whereas Cu+ was found in SII and SII* sites. The fine analysis of the spectra of Cu2+-
Externí odkaz:
https://doaj.org/article/5125085fe986470195e07ac1df8ca9f5
Publikováno v:
Molecules, Vol 26, Iss 9, p 2669 (2021)
In this study, IR studies of the coadsorption of ethanol and CO on Cu+ cations evidenced the transfer of electrons from ethanol to Cu+, which caused the lowering of the frequency of the band attributed to CO bonded to the same Cu+ cation due to the m
Externí odkaz:
https://doaj.org/article/145625f87d054c90adb8c58df38006fb
Autor:
Łukasz Kuterasiński, Jerzy Podobiński, Ewa Madej, Małgorzata Smoliło-Utrata, Dorota Rutkowska-Zbik, Jerzy Datka
Publikováno v:
Molecules, Vol 25, Iss 20, p 4765 (2020)
The process of reduction (by hydrogen and ethanol) and oxidation (by oxygen and NO) of Cu sites in dealuminated faujasite-type zeolites (of Si/Al = 31) was studied by infrared (IR) spectroscopy with CO (for Cu+) and NO (for Cu2+) as probe molecules.
Externí odkaz:
https://doaj.org/article/91639bcf5e4445bead079478b9daf443
Autor:
Mariusz Gackowski, Jerzy Datka
Publikováno v:
Molecules, Vol 25, Iss 5, p 1044 (2020)
The article reviews different strategies towards obtaining mesoporous zeolites Y: desilication; surfactant templating and assembly of zeolite crystals. The impact of those methods on physicochemical properties is covered, with a special focus on the
Externí odkaz:
https://doaj.org/article/927891718014456ab1a7f3c66af03154