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2015 | 13 | 1 |
Article title

Salix viminaliswood as a new precursor for
manufacturing of carbon molecular sieves for
effective methane/nitrogen separation

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Separation of a methane/nitrogen gas mixture
was investigated by means of carbon molecular sieves
(CMS) obtained from a newly discovered “green” resource: Salix viminalis. This plant grows quickly, yields hard
wood and is frequently cultivated for energy purposes
(renewable green fuel). Unconventional applications
such as charcoal fabrication using this sort of wood are
very rare. Carbonization of the wood (1–3 h, 600–700°C)
yields carbons with a very narrow pore size distribution
(determined by N2 adsorption at -196°C) resembling
a perfect CMS. The diameter of most pores (ca. 0.8 nm) is
comparable to the size of simple molecules, thus enabling
separation. The sieving effect was proven in an industrially
important process of CH4/N2 separation at 30–70°C. Despite
relatively minor differences of the size of the molecules,
the experiment demonstrated that separation factors are
placed in the range 3.64–10.20. Additional experiments
involving krypton proved that the separation mechanism
is based on a geometric factor i.e. the known size and
shape of the molecules under separation.
Physical description
1 - 4 - 2015
29 - 4 - 2014
7 - 11 - 2014
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