A5029701981- Catalytic Processes in Materials Science
- Zeolite Catalysis and Synthesis
- Catalysis and Oxidation Reactions
- Mesoporous Materials and Catalysis
- Pigment Synthesis and Properties
- Metal-Organic Frameworks: Synthesis and Applications
- Chemical Synthesis and Characterization
- Advanced Chemical Physics Studies
- Hydrogen Storage and Materials
- Catalysis and Hydrodesulfurization Studies
- X-ray Diffraction in Crystallography
- Clay minerals and soil interactions
- Cultural Heritage Materials Analysis
- Carbon Dioxide Capture Technologies
- Thermal and Kinetic Analysis
- Polyoxometalates: Synthesis and Applications
- High-pressure geophysics and materials
- Ammonia Synthesis and Nitrogen Reduction
- Inorganic Fluorides and Related Compounds
- Iron oxide chemistry and applications
- Transition Metal Oxide Nanomaterials
- Conducting polymers and applications
- Industrial Gas Emission Control
- Building materials and conservation
- Nuclear Physics and Applications
University of Turin
2011-2024
National Interuniversity Consortium of Materials Science and Technology
2004-2024
Interface (United States)
2020
Torino e-district
2018
SINTEF
2008
University of Oslo
2005
Humboldt State University
2000
Simulations Plus (United States)
1997
University of Genoa
1994-1996
Polytechnic University of Turin
1996
UV-Vis DRS and photoluminescence (PL) spectroscopy, combined with excitation selective Raman allow us to understand the main optical vibrational properties of a metal-organic MOF-5 framework. A O(2-)Zn(2+)[rightward arrow] O(-)Zn(+) ligand metal charge transfer transition (LMCT) at 350 nm, testifies that Zn(4)O(13) cluster behaves as ZnO quantum dot (QD). The organic part acts photon antenna able efficiently energy inorganic ZnO-like QD part, where an intense emission 525 nm occurs.
The role of exposed metal sites in increasing the H2 storage performances metal-organic frameworks (MOFs) has been investigated by means IR spectrometry. Three MOFs have considered: MOF-5, with unexposed sites, and HKUST-1 CPO-27-Ni, Cu(2+) Ni(2+), respectively. onset temperature spectroscopic features associated adsorbed correlates adsorption enthalpy obtained VTIR method shift experienced H-H stretching frequency. This relationship can be ascribed to different nature accessibility sites....
A thorough analysis of the vibrational features titanium silicalite-1 (TS-1) catalyst is presented, based on quantitative IR measurements, Raman and resonant experiments, XANES, quantum chemical calculations cluster periodic models. The linear correlation intensity bands located at 960 1125 cm(-1) XANES peak 4967 eV with amount tetrahedral Ti are quantitatively demonstrated. spectra silicalite TS-1 variable content showing main associated insertion into zeolite framework. enhancement feature...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of H2O, CH3OH, (CH3)2O, CH3CN, and Pyridine with the Superacid Perfluorosulfonic Membrane Nafion: An IR Raman StudyRoberto Buzzoni, Silvia Bordiga, Gabriele Ricchiardi, Giuseppe Spoto, Adriano ZecchinaCite this: J. Phys. Chem. 1995, 99, 31, 11937–11951Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August...
The interaction of pyridine with acidic H-ZSM5, H-β, and H-MORD zeolites a perfluorosulfonic superacidic membrane (H-Nafion) has allowed us to study the IR spectrum PyH+ hydrogen bonded negative zeolite skeleton (Z-) or CF2SO3- groups membrane. In presence excess Py formation PyH+···Py is also detected. On (a higher Al content) adsorption at room temperature limited external surfaces crystallite, owing blockage channel mouths caused by formed in high concentration. spectra hydrogen-bonded...
This work is devoted to the study of active species present on TS-1-H2O2/H2O catalytic system and elucidation mechanisms formation interconversion these species. In particular new experimental data computational evidence are reported concerning (i) acidic character hydroperoxo species, (ii) role water in hydroperoxo−peroxo interconversion, (iii) as co-reactant favoring H2O2 adsorption at Ti sites. It demonstrated that gentle drying leads transformation yellow peroxo groups into noncolored...
Due to its fully reversible nature, H(2) storage by molecular adsorption could represent an advantage with respect dissociative processes, where kinetic effects during the charging and discharging processes are present. A drawback of this strategy is represented extremely weak interactions that require low temperature high pressure. High surface area materials hosting polarizing sites can a viable way toward more favorable working conditions. Of these, in contribution, we have studied...
The characteristic yellow color of the TS-1/H2O2/H2O system is attributed to a “side-on” Ti–peroxo species, presumed be active intermediate in partial oxidation reactions. Resonance Raman spectroscopic analysis both zeolite and model salt ((NH4+)3(TiO2F5)3−, see picture) are combined with Ti-free silicalite prove structure hitherto unknown species.
The IR spectra of increasing doses CH3CN interacting with H-ZSM-5, H-MOR, and H-NAFION are investigated compared. In all cases the formation neutral hydrogen-bonded adducts is observed complete vibrational assignment given. basic spectroscopy these complexes discussed in framework Evans approach on Fermi resonance between narrow 2δ 2γ levels continuum distribution associated ν(OH···B) mode coupled low-frequency ν(O···B) vibrations external (thermal) librations. At low dosages interaction H2O...
The oligomerization reaction of ethene and propene on H-ZSM-5 has been studied by fast FTIR spectroscopy. Oligomerization proceeds through: (i) formation short-lived hydrogen-bonded precursors interaction the alkene with internal acidic Brønsted sites, (ii) a protonation step (iii) chain-growth step. relative strength hydrogen bonds in ethene–OH propene–OH π-complexes (precursors) is estimated basis downward shift both ν(OH) ν(CC) frequencies (–389 –11 cm–1 for –539 –19 cm –1 propene). For...
Hydrogen storage is among the most demanding challenges in hydrogen-based energy cycle. One proposed strategy for hydrogen based on physisorption high surface area solids such as metal−organic frameworks (MOFs). Within this class of materials, MOF-5 has been first structure studied storage. The IR spectroscopy adsorbed H2 performed at 15 K and ab initio calculations show that adsorptive properties material are mainly due to dispersive interactions with internal wall weak electrostatic forces...
Maya Blue pigment, used in pre-Colombian America by the ancient Mayas, is a complex between clay palygorskite and indigo dye. The pigment can be manufactured mixing heating to T > 120 degrees C. most quoted hypothesis states that dye molecules enter microchannels which permeate structure, thus creating stable complex. shows remarkable chemical stability, presumably caused interactions formed surfaces. This work aims at studying nature of these means computational spectroscopic techniques....
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN2 Adsorption at 77 K on H-Mordenite and Alkali-Metal-Exchanged Mordenites: An IR StudyF. Geobaldo, C. Lamberti, G. Ricchiardi, S. Bordiga, A. Zecchina, Turnes Palomino, Otero AreanCite this: J. Phys. Chem. 1995, 99, 28, 11167–11177Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.org/doi/10.1021/j100028a018https://doi.org/10.1021/j100028a018research-articleACS...