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A multi-molecular beam/infrared reflection absorption spectroscopy apparatus for probing mechanisms and kinetics of heterogeneously catalyzed reaction from ultrahigh vacuum to near-ambient pressure conditions.
Rev Sci Instrum
January 2025
Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 1, 24118 Kiel, Germany.
A novel multi-molecular beam/infrared reflection absorption spectroscopy (IRAS) apparatus is described, which was constructed for studying mechanisms and kinetics of heterogeneously catalyzed reactions following a rigorous surface science approach in the pressure range from ultrahigh vacuum (UHV, 1 × 10-10 mbar) to near-ambient pressure (NAP, 1000 mbar) conditions. The apparatus comprises a preparation chamber equipped with standard surface science tools required for the preparation and characterization of model heterogeneous catalysts and two reaction chambers operating at different pressure ranges: in UHV and in the variable pressure range up to NAP conditions. The UHV reaction chamber contains two effusive molecular beams (flux up to 1.
View Article and Find Full Text PDFThermodynamics of gaseous strontium and calcium cerates studied by Knudsen effusion mass spectrometry and estimation of relative electron ionization cross-section for CeO(g).
Rapid Commun Mass Spectrom
November 2024
St. Petersburg State Institute of Technology, St. Petersburg, Russian Federation.
Rationale: Ceria-based systems are of great interest because of their unique properties. Such systems may be used as anode materials for SOFCs or in oxygen sensors. The exploitation of these materials often requires high temperatures.
View Article and Find Full Text PDFDescending necrotising mediastinitis: a rare entity in children.
BMJ Case Rep
March 2024
Department of Otorhinolaryngology, Coimbra University Hospital Centre, Coimbra, Portugal.
We present a case of descending necrotising mediastinitis (DNM) originating from a retropharyngeal abscess in a healthy early childhood patient. The patient had a history of fever, odynophagia and refusal to eat, followed by rapid deterioration of the clinical state. Cervicothoracic CT was performed, which revealed a right parapharyngeal abscess, extending to the mediastinum and occupying the retropharyngeal/visceral space, with gaseous content throughout this collection, associated with bilateral pleural effusion, aspects compatible with DNM.
View Article and Find Full Text PDFResearch on the volatility, phase transitions and thermodynamic stability of five organochlorine compounds.
Chemosphere
March 2024
Research Centre in Chemistry of University of Porto (CIQUP), Institute of Molecular Sciences (IMS), Department of Chemistry and Biochemistry (DQB), Faculty of Sciences of University of Porto (FCUP), Rua Do Campo Alegre, P-4169-007, Porto, Portugal. Electronic address:
The present investigation describes the experimental evaluation of relevant physicochemical properties of five organochlorine compounds (OCs), including some that are related to their environmental mobility. The vapor pressures of (2,4'-Dichlorodiphenyl)dichloroethane (2,4'-DDD, CASN:53-19-0), 1,1-Dichloro-2,2-bis(4-chlorophenyl)ethane (4,4'-DDD, CASN:72-54-8) and 2,2-Bis(4-chlorophenyl)acetic acid (4,4'-DDA, CASN:83-05-6), as well as of the bactericide Nitrapyrin (CASN:1929-82-4) and of the rodenticide Crimidine (CASN:535-89-7) were determined at different temperatures. The Knudsen mass-loss effusion technique was employed to determine the sublimation vapor pressures of the referred compounds, apart from Crimidine.
View Article and Find Full Text PDFDetermination and Analysis of Thermodynamic Properties of Methyl Methylanthranilate Isomers.
Molecules
September 2023
Research Center, Institute of Molecular Sciences (IMS), Department of Chemistry and Biochemistry (DQB), Faculty of Sciences, University of Porto (FCUP), Rua do Campo Alegre, 4169-007 Porto, Portugal.
The enthalpies of formation in the gaseous phase of methyl 3-methylanthranilate and methyl 5-methylanthranilate were determined from experimental measurements of the corresponding standard energies of combustion, obtained from combustion calorimetry, and the standard enthalpies of vaporization and sublimation, obtained from Calvet microcalorimetry and Knudsen mass-loss effusion. A computational study, using the G3(MP2)//B3LYP composite method, has also been performed for the calculation of the gas-phase standard enthalpies of formation of those two molecules at = 298.15 K, as well as for the remaining isomers, methyl 4-methylanthranilate and methyl 6-methylanthranilate.
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