Search results for " ALKANE"

showing 6 items of 16 documents

Pressure induced changes in the Raman spectra of liquidn-alkanes and perfluoro-n-alkanes

1982

The main effect of pressures up to 6 kbar on the Raman spectra of liquidn-alkanes and perfluoro-n-alkanes is a reduction of line widths indicative for a slowing-down of rotational motions about the long axes. There is no evidence for a change in the conformer populations.

N alkanessymbols.namesakeColloid and Surface ChemistryPolymers and PlasticsChemistryMaterials ChemistryAnalytical chemistrysymbolsPhysical and Theoretical ChemistryRaman spectroscopyConformational isomerismLine (formation)Colloid and Polymer Science
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Photokatalytische Funktionalisierung von Alkanen

2008

SO2 Alkanen
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Stabilization of ZSM-5 zeolite catalysts for steam catalytic cracking of naphtha for production of propene and ethene

2012

In order to increase ethene and propene, naphtha steam catalytic cracking has been considered. The cracking of C 5-C 12 n-alkanes with ZSM-5 has been studied in absence and in presence of steam and the influence of the operation variables was studied. Irreversible catalyst deactivation by dealumination also occurs in the reactor when the cracking is carried out in the presence of steam. To diminish steam deactivation, the influence of zeolite Si/Al framework and a postsynthesis treatment by phosphorous have been studied and optimized. Much more stable catalyst can be achieved that result in an increase in activity without penalty for production of ethene and propene.

Steam catalytic cracking (SCC)Inorganic chemistryN-AlkanesFluid catalytic crackingcomplex mixturesCatalysisCatalysisPropenechemistry.chemical_compoundQUIMICA ORGANICAZeoliteHydrothermal stabilitiesNaphthaZSM-5 zeoliteTECNOLOGIA DEL MEDIO AMBIENTEN alkanesProcess Chemistry and Technologyfood and beveragesZeolite dealuminationZSM-5 hydrothermal stabilityhumanitiesSi/Al ratioCrackingchemistryPhosphorous stabilized zeoliteAlkenes production
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Alkane dehydrogenation on defective BN quasi-molecular nanoflakes: DFT studies

2020

Lower alkanes are feedstocks readily available but relatively inert. The con- version of low cost alkanes to industrially relevant alkenes is usually carried out on metal-based heterogeneous catalysts. Considering both the cost and the potential harmfulness of the metal involved in the dehydrogenation cat- alysts (typically, platinum or chromium), the study of metal-free processes represents an important challenge for the industrial chemistry in order to address more sustainable protocols and different routes either to activate or transform alkanes. Framed in this context, it was investigated, using a den- sity functional theory approach, the potential dehydrogenation activity of de- fectiv…

chemistry.chemical_classificationAlkaneMaterials science010405 organic chemistryProcess Chemistry and Technologychemistry.chemical_elementContext (language use)010402 general chemistry01 natural sciencesCatalysis0104 chemical sciencesCatalysischemistry.chemical_compoundHydrocarbonchemistryChemical engineeringBoron nitrideSettore CHIM/03 - Chimica Generale E InorganicaDehydrogenationPhysical and Theoretical ChemistryPlatinumBoronMetal-free processes Low cost alkanes conversion Quasi-molecular BN nanoflakes DFT modeling
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Evolution of intermolecular contacts with temperature and pressure in bromoethane and iodo­ethane – a comparative study

2022

At ambient conditions two liquids, bromo­ethane, C2H5Br (MBE, m.p. 154.6 K) and iodo­ethane, C2H5I (MIE, m.p. 162.1 K), have been crystallized under both isobaric and isochoric conditions using in situ low-temperature and high-pressure techniques. The single-crystal X-ray diffraction studies, supported by the isothermal compressibility and isobaric differential scanning calorimetry measurements, allowed the monitoring and analysis at low temperature and high pressure of the effects of externally induced changes in MBE and MIE. The monoclinic MBE and MIE crystals are found to be isostructural. They are stable, in the investigated regimes, i.e. down to 100 K/0.1 MPa and up to ∼295 K/3.7 GPa, …

in situ crystallizationhigh pressurehalogenated alkaneslow temperatureActa Crystallographica Section B-Structural Science Crystal Engineering and Materials
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Highly Active Co3O4-Based Catalysts for Total Oxidation of Light C1–C3 Alkanes Prepared by a Simple Soft Chemistry Method: Effect of the Heat-T…

2021

9 figures, 2 tables.

inorganic chemicalsTechnologyInorganic chemistryTotal oxidationcobalt oxidechemistry.chemical_elementalkane oxidationpropaneHeterogeneous catalysissurface oxygen vacanciesMethaneArticleCatalysischemistry.chemical_compoundPropaneAlkane oxidationSurface oxygen vacanciesPropanetotal oxidationvolatile organic compoundsGeneral Materials ScienceReactivity (chemistry)Volatile organic compoundsCobalt oxideAlkanechemistry.chemical_classificationHeterogeneous catalysisEthaneMicroscopyQC120-168.85methaneTQH201-278.5ethaneEngineering (General). Civil engineering (General)TK1-9971heterogeneous catalysischemistryDescriptive and experimental mechanicsMixed oxideElectrical engineering. Electronics. Nuclear engineeringTA1-2040cobalt oxide; total oxidation; alkane oxidation; heterogeneous catalysis; volatile organic compounds; propane; ethane; methane; surface oxygen vacanciesCobaltMethaneMaterials; Volume 14; Issue 23; Pages: 7120
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