Reference data for the adsorption of benzene on carbon materials

Carrott, P.J.M.; Carrott, M.M.L. Ribeiro; Cansado, I.P.P.; Nabais, J.M. Valente

doi:10.1016/s0008-6223(99)00129-3

Cited by 47 publications

(37 citation statements)

References 14 publications

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“…This value is obtained from the slope of the line joining the origin to the point where adsorption on S e begins, but since this point is not always clearly defined, this approach introduces a some uncertainty (approximately 50-100 m 2 g À1 in the present case). On the other hand, it is obvious that the full use of a refined comparison plot based on nitrogen [16] or benzene [19], provides an independent assessment of S tot , S e , and W o , to be cross-checked with other techniques.…”

Section: Surface Areas From Adsorption Datamentioning

confidence: 99%

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On the determination of surface areas in activated carbons

Stoeckli

Centeno

2005

Carbon

114

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The paper examines the validity of two approaches frequently used to determine surface areas in activated carbons, namely the BET method and the use of immersion calorimetry. The study is based on 21 well characterized carbons, whose external and microporous surface areas, S e and S mi , have been determined by a variety of independent techniques. It appears clearly that S BET and the real surface area S mi + S e are in agreement only for carbons with average pore widths L o around 0.8-1.1 nm. Beyond, S BET increases rapidly and S BET À S e is practically the monolayer equivalent of the micropore volume W o . This confirms that a characterization of surface properties based on S BET is, a priori, not reliable. The study of the enthalpy of immersion of the carbons into benzene at 293 K, based on DubininÕs theory, shows that D i H consists of three contributions, namely from the interactions with the micropore walls (À0.136 J m À2 ), the external surface (À0.114 J m À2 ), and from the volume W Ã o of liquid found between the surface layers in the micropores (À141 J cm À3 ). It appears that for carbons where L o > 1 nm, the real surface area cannot be determined in a reliable way from the enthalpy of immersion and a specific heat of wetting alone.

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Section: Surface Areas From Adsorption Datamentioning

confidence: 99%

“…graphitized carbon black). This so-called external surface area, S e , can be obtained from the comparison of the adsorption isotherm with a reference isotherm determined at the same temperature on a non-porous carbon black [16][17][18][19] (SingÕs classical a-plot for N 2 at 77 K, also extended to other vapours).…”

Section: Introductionmentioning

confidence: 99%

On the determination of surface areas in activated carbons

Stoeckli

Centeno

2005

Carbon

114

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“…Some of the experimental isotherm data have been published previously and analysed in a different context (Carrott et al 2000a(Carrott et al ,b, 2001a. Briefly, organic vapour adsorption isotherms…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, for characterising wider-pore carbons using gas adsorption techniques, it would be difficult to find an adsorptive with an acceptably high vapour pressure at or near to room temperature with a molecular size greater than that of neopentane. It should also be noted that standard adsorption data for both methanol and neopentane are available (Carrott et al 1988(Carrott et al , 2001a.…”

Section: Range Of Validity Of the Tvfmmentioning

confidence: 99%

On the L_o/σ Range of the TVFM

Carrott

Cansado

Carrott

2006

Adsorption Science & Technology

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Adsorption isotherms of nitrogen, carbon dioxide, methanol, dichloromethane, benzene and neopentane were determined on a range of molecular sieve and super-activated carbons with the objective of establishing the range of validity of the Theory of Volume Filling of Micropores (TVFM) in terms of the ratio of pore width to molecular diameter, L o /σ. It is shown that, in the absence of molecular-sieving effects, both the characteristic curve concept and the DR equation are valid over the whole of the micropore range, corresponding to values of L o /σ less than or equal to 5 and to at least a slight enhancement in the characteristic energy, E 0 , of the adsorbent when compared with the corresponding value obtained with non-porous carbon blacks. On the other hand, estimation of the mean micropore width was only possible for values of L o /σ up to ca. 2.3, corresponding to at least a two-fold enhancement in E 0 . Results obtained using N 2 at 77 K showed some significant differences to those obtained with organic adsorptives at higher temperature.

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“…Moreover, this technique has been used for analysis of CNTssee for example (Carrott et al 2000;Eswaramoorthy et al 1999;Gauden et al 2006;Jing et al 2004;Stoeckli and Centeno 2005;Wiśniewski et al 2015a). In addition, CNT functionalization with biological molecules (such as proteins, DNA, nucleic acids, etc.…”

Section: Introductionmentioning

confidence: 99%

The influence of geometric heterogeneity of closed carbon nanotube bundles on benzene adsorption from the gaseous phase-Monte Carlo simulations

et al. 2015

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Benzene adsorption from the gaseous phase at 298 K and the thermodynamics of this process using Monte Carlo methods is studied. A series of closed single-walled carbon nanotube (SWCNT) bundles (triangular packing arrangement) with various distance between nanotubes is investigated. Isolated closed nanotube is treated as the reference system. Benzene is considered as a model compound to represent aromatics. Simulation results show the significant effect of the geometric heterogeneity on benzene adsorption as well as the enthalpy and entropy at low surface coverages. For insignificantly separated nanotubes and at low benzene uptakes, the entropy of the adsorbed phase is close to the entropy of solid benzene. Therefore, C 6 H 6 molecules strongly interacting with walls are ordered in quasi-solid structures. At higher surface coverages, the ordering and packing of benzene molecules is liquid-like. The geometry of bundles (mutual position of SWCNTs) significantly influences the position and orientation of adsorbed molecules against the wall.

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Reference data for the adsorption of benzene on carbon materials

Cited by 47 publications

References 14 publications

On the determination of surface areas in activated carbons

On the determination of surface areas in activated carbons

On the L_o/σ Range of the TVFM

The influence of geometric heterogeneity of closed carbon nanotube bundles on benzene adsorption from the gaseous phase-Monte Carlo simulations

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Reference data for the adsorption of benzene on carbon materials

Cited by 47 publications

References 14 publications

On the determination of surface areas in activated carbons

On the determination of surface areas in activated carbons

On the Lo/σ Range of the TVFM

The influence of geometric heterogeneity of closed carbon nanotube bundles on benzene adsorption from the gaseous phase-Monte Carlo simulations

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Product

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On the L_o/σ Range of the TVFM