II International Symposium on Carbon for Catalysis ABSTRACTS

PP-<strong>II</strong>-13
from the rapeseed straw and corncobs using water vapour with the greatest micropore
volumes. The nitrogen and sulphur oxides are adsorbed on examined materials in quantities of
2 – 7 and 0,5 - 4 mmol/g respectively. It means that one kilogram of sorbent can accumulate
from 60 to 220 g of NO x and SO 2 respectively. The lowest sorption capability was observed
for char prepared from corncobs whereas the highest for all investigated active carbons
obtained by using water vapour.
NH 3
9
8
7
6
KKK AKK H2O AKK CO2 ASR CO2 NO
4,5
4
3,5
3
KKK AKK H2O AKK CO2 ASR CO2
a, [mmol/g]
5
4
a, [mmol/g]
2,5
2
3
1,5
2
1
1
0,5
0
0 100 200 300 400 500 600 700 800
p, [mmHg]
0
0 100 200 300 400 500 600 700 800
p, [mmHg]
SO 2
0
KKK AKK H2O AKK CO2 ASR CO2
8
7
6
a, [mmol/g]
5
4
3
2
1
0 100 200 300 400 500 600 700 800
p, [mmHg]
Fig.1. Isotherms of adsorption for ammonia,
nitrogen (<strong>II</strong>) oxide, sulphur dioxide measured
on char and active carbons prepared from
corn-cobs and from rapeseed straw.
Conclusions
• Sorption ability expressed as quantity of adsorbed gas in milimoles per gram of active
carbon diminishes in the following order: NH 3 , SO 2 , NO. Simultaneously, the
quantities
of adsorbed gases on active carbons are remarkably higher in comparison with
the amount adsorbed on a char.
• Good sorption abilities of sorbents prepared from the biomass with regard of examined
gases make them very interesting taking into account their practical application
in environmental protection.
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