A Raman spectroscopy study of the separation of hydrofluorocarbons using zeolites
Article Abstract:
The separation of the hydrofluorocarbon (HFC)-134a from its isomer HFC-134via the differential surface adsorption on the zeolite NaX was investigated using Raman spectroscopy. The trans-gauche population ratio for HFC-134 adsorbed on NaX was found to decrease by up to 20-fold compared to the gas phase. The conformational ratio was also found to change with the HFC loading, with the polar gauche conformer being more preferred when the separation factor is maximum.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Structural characterization and hydrochlorofluorocarbon reactivity on zinc-exchanged NaX
Article Abstract:
A structural study was conducted relating to research on the use of basic zeolites as materials for separating different mixtures of hydrofluorocarbons and hydrochlorofluorocarbons. The study used X-ray powder diffraction of the bare zeolite Zn2+-exchanged NaX and results of previous reaction studies of hydrochlorofluorocarbon-124a to estimate the positions of the zinc and residual sodium cations. Experimental methodology, results and conclusions are discussed.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
An in-situ X-ray powder diffraction study of the adsorption of hydrofluorocarbons in zeolites
Article Abstract:
A study of hydrofluorocarbon (HFC)-134 (CF2HCF2H) and -134a (CF3CFH2) adsorption on NaY is performed as a function of the temperature of the zeolite molecular sieve by employing a time resolved in situ synchrotron X-ray powder diffraction method. Results indicated that the kinetics of sorption depended largely on temperature, where lower temperatures reached equilibrium more rapidly.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2001
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Piezo X-ray absorption spectroscopy for the investigation of solid-state transformations in the millisecond range
- Abstracts: Ab initio study of chemisorption reactions for carboxylic acids on hydrogenated silicon surfaces. Temperature-controlled growth of silicon-based nanostructures by thermal evaporation of SiO powders
- Abstracts: Molecular diffusion and photooxidation chemistry on TiO2 surfaces under perfluoroalkane layers. N2O adsorption and photochemistry on high area TiO2 powder