Properties of Nitrogen-Containing Carbons

Introduction of nitrogen atoms in the structure of carbons wiU influence many of their properties. Pyridine and pyrrole are Lewis bases, and such structures will 

Some of the nitrogen functions (e.g., N-6, N-5, N-Ox) are hydrophilic. As for N-Q, increased water vapor adsorption by nitrogen-containing carbon aerogels, compared to similar but N-free material was explained by polarization of the graphene layers near substitutional N-Q atoms that creates hydrophilic adsorption centers [84]. The adsorption isotherms appeared to be superpositions of a type II 

Sample PretreatmenC NaOH Uptake (trmoyg) HCl Uptake (p,moyg) 

Sample Nitrogen Content (ptmol/g) HCl Uptake (ptmol/g) 

Sample N Content (qmol/g) Burn-off (%) Activation Time (h) 

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See for a nice overview on the catalytic properties of nitrogen-containing carbons Boehm, H.-P. (2009) in Carbon Materials for Catalysis (eds P, Serp and J.L. Figueiredo), John Wiley Sons Inc., Hoboken, NJ, pp, 219-265,... 

Huang Y, Gao J, Liu R. Structure and electronic properties of nitrogen-containing carbon nanotubes. Synth Me. 2000 113 251-5. 

Unfortunately, no nitrogen contents of the carbons used for H2S adsorption are cited in the literature. The good performance of nitrogen-containing carbons was ascribed to their basic properties [58], H2S will dissociate at the basic surface sites, their hydrophilicity would provide for adsorbed water. An adsorbent prepared from bituminous coal with the addition of basic oxides such as CaO and MgO and of iron oxides has a much higher capacity than that of Centaur [136],... 

Natural gas, found in geological accumulations, normally refers to the gaseous fossil-based equivalent of oil. Its composition varies widely, from high concentrations of nitrogen and carbon dioxide to (almost) pure methane. In general, it contains low concentrations of the higher (saturated) hydrocarbons, which influence the physical properties and may present condensation problems in high-pressure transport lines. 

In the present work, a different technique (pyrrole polimerisation and carbonisation) has been applied to prepare nitrogen-containing carbons from mesoporous materials. The influence of iron present in the matrix skeletons, introduced by impregnating the matrices with FeCl3, on the properties of the carbon replicas has been evaluated. 

A large number of nitrogen containing organosilicon compounds with insect-repellent and antimicrobial activity is reported by Lukevics34. Biological properties of analogous carbon compounds have not been described so far. 

Owing to the high polarizability of the carbon-selenium double bond, selenoesters can easily be attacked by nucleophiles. This property makes a selenoester a useful reagent for the synthesis of hetero-cycles. Condensation of selenoesters with bifiinctional aromatic or aliphatic amines has yielded a variety of nitrogen-containing heterocyclic compounds (Scheme 19). 

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