A5078514982- Catalysis and Oxidation Reactions
- Catalytic Processes in Materials Science
- Mesoporous Materials and Catalysis
- Catalysis for Biomass Conversion
- Zeolite Catalysis and Synthesis
- Catalysis and Hydrodesulfurization Studies
- Carbon dioxide utilization in catalysis
- Supercapacitor Materials and Fabrication
- Catalysts for Methane Reforming
- Membrane Separation and Gas Transport
- Metal-Organic Frameworks: Synthesis and Applications
- Polyoxometalates: Synthesis and Applications
- biodegradable polymer synthesis and properties
- Oxidative Organic Chemistry Reactions
- Fuel Cells and Related Materials
Adam Mickiewicz University in Poznań
2015-2025
Faculty (United Kingdom)
2020
Laboratoire de Réactivité de Surface
2009
Polish Academy of Sciences
2009
Kyoto University
2009
Sorbonne Université
2009
Centre National de la Recherche Scientifique
2009
This study investigates the use of potassium-modified silicalite-1 as a catalyst for transesterification glycerol to carbonate (Glyc. Carbonate) with dimethyl (DMC). Silicalite-1, typically inactive due absence extra-framework cations, was modified potassium compounds (fluoride, chloride, and hydroxide), which create basic sites by interacting structural defects formed through silicon removal. modification significantly enhances catalyst’s performance in transesterification. The reaction...
CrxSiBEA catalysts (x = 0.2, 1.0, and 3.4 Cr wt %) are prepared by a two-step postsynthesis method. The introduction of ions in the framework dealuminated SiBEA zeolite evidenced XRD generates Brønsted acidic sites as shown FTIR pyridine used molecular probe. In prepared, chromium is mainly present octahedral Cr(III) calcined (773 K, 3 h, flowing air) distorted tetrahedral Cr(VI), DR UV−vis, TPR, XPS. Upon outgassing at 773 K for 1 h (10−3 Pa), part Cr(VI) reduced to Cr(V), EPR. Isolated...
Solketal, a widely used glycerol-derived solvent, can be efficiently synthesized through heterogeneous catalysis, thus avoiding the significant product losses typically encountered with aqueous work-up in homogeneous catalysis. This study explores catalytic synthesis of solketal using solid acid catalysts derived from recovered carbon blacks (rCBs), which are obtained pyrolysis end-of-life tires. was further converted into introduction acidic functional groups concentrated H
Abstract Glycerol ketalization with acetone to solketal, an oxygenate fuel additive, was demonstrated over hierarchical zeolites of ZSM5, Beta and Mordenite structure in a continuous flow system. Micro‐mesoporous were prepared two steps, by means alkaline treatment NaOH followed the ionic exchange NH 4 NO 3 subsequent citric acid. The presence mesopores applied catalysts confirmed N 2 adsorption/desorption measurements TEM microscopy. Hierarchical showed superior catalytic performance...
The present study investigated the influence of silica support texture on catalytic performance VOx/silica catalysts in selective oxidation propane. Two- and three-dimensional mesoporous materials, SBA-15 MCF, were synthesized using hydrothermal methods to create different pore structures. Vanadium (approximately 5 wt%) was incorporated into matrices (MCF, SBA-15) SiO2 (used as a reference system) through impregnation. surface composition, valence state, reducibility VOx species accommodated...
Two series of V-containing BEA zeolite catalysts, VxSiBEA(I) and VxSiBEA(II), were prepared by a two-step postsynthesis preparation procedure which consists, in the first step, dealumination TEABEA zeolites treatment with nitric acid solution to obtain SiBEA Si/Al atomic ratio 1000 then, second bringing into contact an aqueous NH4VO3 different concentrations at pH 2.7. After 3 days, solids recuperated from reaction mixtures: (1) on sinter funnel washed several times distilled water (2)...
Modified silicalite-1 with MFI structure, containing acid centers, as an active catalyst in solketal formation.
Imidazole molecules entrapped in porous materials can exhibit high and stable proton conductivity suitable for elevated temperature (>373 K) fuel cell applications. In this study, new anhydrous conductors based on imidazole mesoporous KIT-6 were prepared. To explore the impact of acidic nature matrix conduction, a series with varying Si/Al ratios pure silica synthesized. These additionally modified cerium atoms to enhance their Brønsted acidity. TPD-NH3 esterification model reaction...
Fe-ZSM-5 zeolites with a Si/Al ratio equal to 25 and 50, comprising 0.4 wt% of Fe calcined at different temperatures, were used for oxidative dehydrogenation (ODH) C2–C4 hydrocarbons. The calcination temperature (873 or 1173 K) slightly influenced hydrocarbon conversion, while it distinctly affected the selectivity towards respective olefins. It stems from modification acidic centers present in samples. Calcination K resulted decrease total acidity, especially strong Brønsted sites. UV-vis...
Vanadium modified mesocellular silica foams (MCF) materials (V content ca. 3 and 5 wt%) prepared by the impregnation method show mainly isolated or low-polymeric VOx species, which was confirmed means of Raman spectroscopy DR UV–Vis. Textural measurements, also XRD TEM results indicate that characteristic structural features MCFs are preserved after vanadium incorporation. The MCF-supported vanadia catalysts exhibit much higher propene conversion oxide productivity when compared to...
V-containing mesoporous silica with 3D structure was prepared by a hydrothermal procedure using NH4VO3 as the vanadium precursor and varied reaction mixture pH values (pH = 3 5). The combined use of DR UV-vis H2-TPR techniques confirmed successful incorporation into material. number acid sites, evidenced ammonia TPD, strongly correlates content. Propene oxidation N2O revealed noticeable activity synthesised vanadium-containing materials in epoxidation reactions. synthesized vanadosilicates...
Propane to propene oxide (PO) oxidation over V-containing mesoporous silica of SBA-3 structure has been studied using different oxidants (nitrous oxide, oxygen, and their mixture) in the temperature range 673–773 K. Electron spin resonance spectroscopy, ultraviolet–visible X-ray photoelectron spectroscopy (XPS), as well diffraction, temperature-programmed reduction with hydrogen (H2 TPR), low-temperature N2 adsorption/desorption, were applied for characterization fresh spent catalysts. XPS...