A5011758060- Catalytic Processes in Materials Science
- Zeolite Catalysis and Synthesis
- Catalysis and Oxidation Reactions
- Chemical Synthesis and Characterization
- Mesoporous Materials and Catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Metal-Catalyzed Oxygenation Mechanisms
- Catalysis and Hydrodesulfurization Studies
- Advanced NMR Techniques and Applications
- Catalysts for Methane Reforming
- Advanced Battery Materials and Technologies
- Clay minerals and soil interactions
- Iron oxide chemistry and applications
- Nanomaterials for catalytic reactions
- Phase Equilibria and Thermodynamics
- Oxidative Organic Chemistry Reactions
- Carbon Dioxide Capture Technologies
- Gas Sensing Nanomaterials and Sensors
- Thermal and Kinetic Analysis
- Porphyrin Metabolism and Disorders
- Photodynamic Therapy Research Studies
- Marine Biology and Environmental Chemistry
- Bone Tissue Engineering Materials
- Industrial Gas Emission Control
Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry
2016-2025
Czech Academy of Sciences
2012
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences
2005-2006
Jagiellonian University
2006
This paper describes a study of the nature and accessibility acid sites in micromesoporous mordenite zeolites obtained by desilication dealumination analysis their activity selectivity hydroisomerization n-hexane. Alkaline–acid, acid–alkaline–acid, fluorination–alkaline–acid postsynthesis treatments were employed for preparation mordenites. The FTIR spectra adsorbed d3-acetonitrille, 27Al MAS NMR, HR-TEM, N2 adsorption used quantitative Brønsted Lewis sites, coordination Al atoms, textural...
SSZ-13 is a Si-rich (Si/Al > 5) small pore zeolite (chabazite topology) important for both acid and redox catalysis. Using sample with Si/Al = 12, new procedure involving 27Al (3Q) MAS NMR spectroscopy extensive periodic DFT calculations molecular dynamics, in addition to the standard methods based on bare Co(II) cations as probes monitored by FTIR UV–vis spectroscopy, was employed. The placement of Al–O–(Si–O)2–Al Al–O–(Si–O)3–Al sequences framework determined (Al–O–Si–O–Al are absent). 54%...
Abstract Zeolites are highly important heterogeneous catalysts. Besides Brønsted SiOHAl acid sites, also framework Al FR Lewis sites often found in their H‐forms. The formation of zeolites is a key issue regarding selectivity acid‐catalyzed reactions. local structures dehydrated and precursors—“perturbed” atoms hydrated zeolites—were studied by high‐resolution MAS NMR FTIR spectroscopy DFT/MM calculations. Perturbed correspond to (SiO) 3 AlOH groups characterized broad 27 resonance ( δ i...
The enhanced effect of strongly acidic proximate protons (distance 5.0–5.5 Å) in ZSM-5 was presented on complex propene oligomerization up to the aromatization and development individual carbenium ion intermediates zeolite pores.
Cu and Fe zeolites can activate oxygen for oxidative reactions of methane stable hydrocarbon molecules. Here, we analyzed the activity sites with various nuclearities coordinations in *BEA toward complete oxidation methane, toluene, ethanol by molecular oxygen. Spectral analysis interaction individual a kinetic study show that is catalyzed different active activation energies. In low-temperature region (225–325 °C), primarily caused reactive bridging atoms dimeric clusters. Isolated Fe3+-oxo...
Abstract The organization of aluminium atoms in zeolites affects their catalytic properties. Here we demonstrate that the distribution is a key parameter controlling reaction pathway acid catalysed reactions over ZSM-5 zeolites. We study ethanol transformation two samples with similar Si/Al ratios ~15, and located mainly at channel intersections but differently distributed framework. One contains mostly isolated while other has large fraction one ring. FT-IR time-resolved operando study,...
Highly active and stable inorganic material for dissociation of dioxygen methane oxidation to methanol was developed.
This study highlights the efficiency of Cu‐FER catalysts with varying copper loadings in transforming carbon dioxide (CO2) and methane (CH4) into methanol or acetic acid. XAS, UV‐Vis, FTIR analyses confirmed that low loading contain a high fraction isolated Cu2+ cations, while those exhibit significant presence Cu oxo‐species. In‐situ studies (FTIR mass spectrometry) revealed bare Cu(II) synergy Brønsted acid sites, facilitate conversion CO2 CH4 via coupled oxidation carbonylation reactions....
Three generations of cobalt porphyrins were synthesized, physicochemically characterized by FTIR and UV/Vis spectroscopy as well cyclic voltammetry applied catalysts in the oxidation cycloalkanes with atmospheric molecular oxygen under mild conditions. All examined active tested reaction, their catalytic activity varied nature number substituents on porphyrin ring. Introduction electron-withdrawing or electron-donating at rings increases metalloporphyrin complexes. It was found, for first...
Abstract Highly active oxygen capable to selectively oxidize methane methanol at low temperature can be prepared in transition-metal cation exchanged zeolites. Here we show that the α -oxygen stabilized by negative charges of two framework aluminum atoms dissociation nitrous oxide over distant binuclear structures (M(II)…M(II), M = cobalt, nickel, and iron) accommodated adjacent 6-rings forming cationic sites ferrierite zeolite. This species is analogous known only for iron In contrast...
NH3 temperature-programmed desorption (NH3 -TPD) is frequently used for probing the nature of active sites in CuSSZ-13 zeolite selective catalytic reduction (SCR) NOx . Herein, we propose an interpretation -TPD results, which takes into account temperature-induced dynamics interaction with centers. It based on a comprehensive DFT/GGA+D and first-principles thermodynamic (FPT) modeling adsorption single Cu2+ , Cu+ [CuOH]+ centers, dimeric [Cu-O-Cu]2+ [Cu-O22- -Cu]2 species, segregated CuO...