6533b827fe1ef96bd1286e28
RESEARCH PRODUCT
Structural Signatures of Type IV Isotherm Steps: Sorption of Trichloroethene, Tetrachloroethene, and Benzene in Silicalite-I
O. BertrandGuy WeberN. FloquetJ. P. CoulombJ. P. Bellatsubject
Phase transitionNeutron diffractionSorptionOne-StepSurfaces Coatings and Filmschemistry.chemical_compoundAdsorptionMonomerchemistryMaterials ChemistryPhysical chemistryOrganic chemistryMoleculePhysical and Theoretical ChemistryBenzenedescription
We have investigated by in situ neutron diffraction the structural properties of C2HCl3, C2Cl4, and C6D6 sorbed phases in silicalite-1. Our motivation is to correlate the structure of these three confined species to the fact that their adsorption isotherms are characterized by no step, one step, and two steps, respectively. From our detailed neutron diffraction investigation, we deduce that the adsorption isotherm steps are not signatures of phase transitions but are correlated to the different adsorption stages observed during the silicalite-1 loading. For C6D6, such a loading is a three stage process (the C6D6 molecules fill successively, the intersections, then the straight channels and the sinusoidal channels by forming dimers and then interconnecting monomer chains). Concerning C2Cl4, it is a two stage process (the C2Cl4 molecules fill the intersections and after indifferently the straight channels and the sinusoidal channels). Usual sorption is observed for C2HCl3, which fills all parts of the silic...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-12-17 | The Journal of Physical Chemistry B |