Adsorption and Pore-Size Measurements on Charcoals and Whetlerites.

Emmett, P. H.

doi:10.1021/cr60134a003

Cited by 108 publications

(22 citation statements)

References 63 publications

(140 reference statements)

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“…Little is known about the structure of surface nitrogen species, although the capability of fixation of nitrogen [18] in carbon particles and the promoting effect of the catalytic activity of nitrogenous carbon [19] have been observed. We have investigated the structure of surface nitrogen complexes produced as a result of the reaction between carbon particles and NH 3 at both an oxidizing [1] and a reducing atmosphere.…”

Section: Surface Complexesmentioning

confidence: 99%

Chemical and Catalytic Properties of Elemental Carbon

et al. 1982

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Section: Surface Complexesmentioning

confidence: 99%

Chemical and Catalytic Properties of Elemental Carbon

et al. 1982

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“…The distinction between adsorption on a surface and in a pore can be seen at the onset of adsorption which, for a highly graphitized surface, does not occur until the pressure is close to the saturation vapour pressure (or even beyond, Easton and Machin, 2000). By contrast, adsorption in porous carbons begins at a lower pressure, which can be attributed either to the larger concentration of functional groups or to the nucleation of clusters from water trapped in very small pores (Nguyen and Bhatia, 2011) and the ease with which clusters can grow and merge due to the proximity of the pore walls (Emmett et al, 1948). co-workers (1950, 1951), Young et al (1954) and Millard et al (1955) made some of the earliest studies of water adsorption on the graphitized thermal carbon black, Graphon (Figure 16).…”

Section: Water Adsorptionmentioning

confidence: 99%

The interplay between molecular layering and clustering in adsorption of gases on graphitized thermal carbon black – Spill-over phenomenon and the important role of strong sites

Tan

Zeng

et al. 2015

Journal of Colloid and Interface Science

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We analyse in detail our experimental data, our simulation results and data from the literature, for the adsorption of argon, nitrogen, carbon dioxide, methanol, ammonia and water on graphitized carbon black (GTCB), and show that there are two mechanisms of adsorption at play, and that their interplay governs how different gases adsorb on the surface by either: (1) molecular layering on the basal plane or (2) clustering around very strong sites on the adsorbate whose affinity is much greater than that of the basal plane or the functional groups. Depending on the concentration of the very strong sites or the functional groups, the temperature and the relative strength of the three interactions, (a) fluid-strong sites (fine crevices and functional group) (F-SS), (b) fluid-basal plane (FB) and (c) fluid-fluid (FF), the uptake of adsorbate tends to be dominated by one mechanism. However, there are conditions (temperature and adsorbate) where two mechanisms can both govern the uptake. For simple gases, like argon, nitrogen and carbon dioxide, adsorption proceeds by molecular layering on the basal plane of graphene, but for water which represents an extreme case of a polar molecule, clustering around the strong sites or the functional groups at the edges of the graphene layers is the major mechanism of adsorption and there is little or no adsorption on the basal planes because the F-SS and FF interactions are far stronger than the FB interaction. For adsorptives with lower polarity, exemplified by methanol or ammonia, the adsorption mechanism switches from clustering to layering in the order: ammonia, methanol; and we suggest that the bridging between these two mechanisms is a molecular spill-over phenomenon, which has not been previously proposed in the literature in the context of physical adsorption.

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“…Number of procedures and precursors for preparing CMSs have been proposed and developed since the discovery of molecular sieving effect of Saran char in the late 1940s [10]. More recently, highly ordered microporous and mesoporous materials, like zeolites or MCM silicas, have proved to be useful molecular sieves [11].…”

Section: Journal Of Materialsmentioning

confidence: 99%

Nanoscale Phenomena Occurring during Pyrolysis of Salix viminalis Wood

Cyganiuk

Klimkiewicz

Olejniczak

et al. 2013

Journal of Materials

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Selective utilisation of unique properties of Salix viminalis wood enables preparation of materials of nanotechnologic properties. Thermal decomposition of lignin-cellulose organic matter results in the formation of a nanostructured porous carbon matrix (charcoal). Narrowed pore size distribution (PSD) in the subnanometer range allows to consider the charcoals as carbon molecular sieves (CMSs), which are capable of separating even chemically inert gases like neon, krypton, and nitrogen. High tolerance of Salix viminalis to heavy metal ions enables enriching living plant tissues with metal ions like lanthanum and manganese. Such ions may later form LaMnO 3 with parallel transformation of plant tissues (organic matter) to carbon matrix using a heat treatment. In this way, one gets a hybrid material: a porous carbon matrix with uniformly suspended nanocrystallites of LaMoO 3 . The crystallites are in the catalytically active phase during the conversion of n-butanol to heptanone-4 with high yield and selectivity.

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Adsorption and Pore-Size Measurements on Charcoals and Whetlerites.

Cited by 108 publications

References 63 publications

Chemical and Catalytic Properties of Elemental Carbon

Chemical and Catalytic Properties of Elemental Carbon

The interplay between molecular layering and clustering in adsorption of gases on graphitized thermal carbon black – Spill-over phenomenon and the important role of strong sites

Nanoscale Phenomena Occurring during Pyrolysis of Salix viminalis Wood

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