Evaluation of the thermodynamic parameters for the adsorption of some n-alkanes on A type zeolite crystals by inverse gas chromatography

Tümsek, Fatma; Inel, Oğuz

doi:10.1016/s1385-8947(03)00046-9

Cited by 42 publications

(29 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the diffusional time is proportional to the squared particle size, these diffusion limitations inside the After the dispersion of CuCl, the adsorption constants (Table 2) of propane on the zeolite adsorbent hardly change. Only a small increase in the adsorption enthalpy and isosteric heat (Tables 2 and 3) are observed, probably due to the increased density of the adsorbent by the coverage of the zeolite surface with CuCl, resulting in larger attractive forces (Tümsek and Inel 2003). Literature data is limited for the CuCl/NaX adsorbent.…”

Section: Single Component Isothermsmentioning

confidence: 98%

“…Since the increase in the propylene selectivity is relatively small at higher pressures, the capacity of the adsorbent is reduced after CuCl dispersion, and desorption from NaX is easier, in an industrial pressure swing adsorption (PSA) unit NaX without dispersed CuCl would be the sorbent of choice. Furthermore, the CuCl/NaX sorbent is sensitive to humid air, leading to its deterioration (Van Miltenburg 2007).…”

Section: Binary Mixture Adsorption and Selectivitymentioning

confidence: 99%

“…In order to obtain a larger number of accessible selective adsorption sites, transition metals can be dispersed over supports with large surface area as referred to earlier (Van Miltenburg et al 2006;Van Miltenburg 2007). In this study the single and binary adsorption of propane and propylene were investigated for Faujasite NaX zeolite crystals as such and for CuCl dispersed in this zeolite.…”

Section: Introductionmentioning

confidence: 99%

“…In this study the single and binary adsorption of propane and propylene were investigated for Faujasite NaX zeolite crystals as such and for CuCl dispersed in this zeolite. The zeolite was synthesized according to our recipe reported elsewhere (Van Miltenburg et al 2006;Van Miltenburg 2007). By thermal treatment the CuCl was dispersed in the pores of the zeolite.…”

Section: Introductionmentioning

confidence: 99%

“…Because of the formation of the π -complex of the olefin with CuCl, the olefin is expected to show a stronger affinity with the zeolite adsorbent after CuCl dispersion. A 36 wt% mixture was chosen as characterizations showed that this appeared to be the saturation capacity; moreover, compared to lower loading, it was more stable during handling in the ambient atmosphere (Van Miltenburg 2007).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Propylene/propane mixture adsorption on faujasite sorbents

et al. 2008

View full text Add to dashboard Cite

The adsorption of propylene and propane on zeolite NaX with and without a saturated (36 wt%) amount of CuCl have been investigated. The single component adsorption isotherms could be well described with a Dual-Site Langmuir model. The dispersion of CuCl results in a decrease of the maximum adsorption capacity of the zeolite for both components. For propylene a strong adsorption via π-complexation with CuCl is present, increasing the adsorption selectivity of the zeolite.The binary mixture (50 : 50) adsorption was determined via breakthrough/desorption experiments at 318, 358 and 408 K with a partial pressure of the two components between 0.8-54 kPa. For NaX the mixture loading could be well described with the IAS-theory and the single component isotherms, both qualitatively and quantitatively. A transition from an enthalpy controlled adsorption at lower loadings to an entropy affected adsorption at higher loadings was observed. The IAS-theory could only qualitatively describe the trends in the observed mixture adsorption for the CuCl/NaX adsorbent. The dispersion of CuCl in NaX results in a modest improvement of the adsorption selectivity for propylene over propane (from 3-7 to 15-30) but at the expense of a reduced capacity.

show abstract

Section: Single Component Isothermsmentioning

confidence: 98%

Section: Binary Mixture Adsorption and Selectivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Propylene/propane mixture adsorption on faujasite sorbents

et al. 2008

View full text Add to dashboard Cite

show abstract

Study on the surface properties of grafted polyethylene particles by inverse gas chromatography

Zhao

Zhang

Guo

et al. 2008

J of Applied Polymer Sci

View full text Add to dashboard Cite

Inverse gas chromatography (IGC) studies on the surface of polyethylene (PE) particles grafted with acrylic acid and acryl amide have been reported. Surface properties of the virgin and grafting-modified PE were compared by IGC. The dispersive contributions of the surface free energy g d s and the K A and K B parameters expressing the ability of the stationary phase to act as Lewis acid or Lewis base were calculated. The results showed that the g d s value increased significantly after grafting. The PE samples grafted with acrylic acid and acrylamide showed a predominantly basic character while the virgin PE was acidic. All of these suggested that the surface of PE has been modified through the grafting reaction, and thus is expected to improve its adhesions with other polymers.

show abstract

Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

Nastasović¹,

Onjia²,

Milonjić³

et al. 2005

Macro Materials & Eng

View full text Add to dashboard Cite

Summary: Inverse gas chromatography under finite surface coverage conditions (IGC‐FC) was used for the investigation of sorption of hexane, benzene, chloroform and tetrahydrofuran on macroporous crosslinked poly[(glycidyl methacrylate)‐co‐(ethylene glycol dimethacrylate)], poly(GMA‐co‐EGDMA), and copolymer modified with ethylene diamine, EDA, poly(GMA‐co‐EGDMA)‐en, in the temperature range 333–363 K. Two poly(GMA‐co‐EGDMA) samples with different porosity parameters were synthesized by suspension copolymerization and modified using a ring‐opening reaction of the pendant epoxy groups with EDA. The specific surface areas of the initial and modified copolymer samples were determined by the BET method from low temperature nitrogen adsorption isotherms (77 K). The adsorption isotherms determined from chromatographic peaks of adsorbates were analyzed using the BET theoretical model and used for estimation of the surface area, isosteric heat of adsorption and the adsorption energy distribution on the surface of the initial and modified copolymer samples. It was observed that the adsorbate nature and the properties of the solid surface of the initial and modified copolymer governed the uptake of adsorbate by the copolymer. The deviations observed for the Sa values obtained by the BET method from the low temperature nitrogen adsorption isotherms and hexane was attributed not only to the difference in molecule size, but also to the specific polymer‐adsorbate interactions. The isosteric heat of adsorption approached a constant value with increasing adsorbate loading. A large variation in the shapes of the qst‐α curves resulted from strong acid‐base interactions, as well as dissolution phenomena. Of the four studied adsorbates, chloroform was shown to have the greatest affinity towards the surface of the investigated polymer samples.Adsorption isotherms of hexane on sample 1 and 1a.magnified imageAdsorption isotherms of hexane on sample 1 and 1a.

show abstract

Evaluation of the thermodynamic parameters for the adsorption of some n-alkanes on A type zeolite crystals by inverse gas chromatography

Cited by 42 publications

References 25 publications

Propylene/propane mixture adsorption on faujasite sorbents

Propylene/propane mixture adsorption on faujasite sorbents

Study on the surface properties of grafted polyethylene particles by inverse gas chromatography

Characterization of Glycidyl Methacrylate Based Copolymers by Inverse Gas Chromatography under Finite Surface Coverage

Contact Info

Product

Resources

About