The effects of various SO2 and NO concentrations
on
the adsorption capacity of activated carbon were measured experimentally
for sequential and simultaneous adsorption of SO2 and NO
in a fixed bed using an area integral calculation method. The results
show that higher NO concentrations increase SO2 adsorption,
especially for C
NO > 200 ppm; however,
higher SO2 concentrations restrict NO adsorption with little
NO adsorbed for C
SO2
> 700
ppm. The NO adsorption capacity decreases as the SO2/NO
ratio increases, while the total adsorption capacity for SO2 and NO has a peak at SO2/NO = 1.7. The product analysis
by XPS supports that NO promotes SO2 chemisorption, SO2 occupies both C–O and CO groups, but NO occupies
the C–O group. The TPD-MS measurement shows that most of the
SO2 is chemisorbed, and the ion chromatography measurement
indicates that 66.0% of the total adsorbed SO2 is oxidized
to SO3. SO2 replaces the physisorbed NO, which
is 94.3% of the total adsorbed NO, but cannot desorb the chemisorbed
NO. TPD experiments show two NO desorption peaks at 200 and 280 °C,
and almost all the NO desorbed as the temperature increases to 500
°C, with the chemisorbed NO being 5.6% of the total adsorbed
NO.
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