| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程研究所 === 83 === The adsorption of SO2 by the pellet of MgCO3 and additives have
been studied by a thermogravimeteric analyzer along with X-ray
diffractometer , surface area meter and scanning electron
microscope . The study was divided into two parts . The first
part was on the effects of the different additives upon the
sorption reactivity and final conversion . In the second part ,
MgCO3 was mixed with Fe2O3 . The effects of the following
variables on the reactivity were studied : the amount of Fe2O3
, the grain size of Fe2O3 , calcination temperature and
sulfation temperature . Results of the first part indicated
that Fe2(SO4)3 , FeSO4 , K2SO4 , Cu(NO3)2 , KNO3 , K2CO3 ,
NaHCO3 , Na2CO3 , and Fe2O3 accelerated the adsorption while Li2
SO4 , Fe(NO3)3 , Al2O3 , TiO2 , SiO2 , SnCl2 , NaCl , KCl and
CaCl2 inhibited the adsorption . Results of the second part
showed that the reaction rate could be increased by increasing
the amount of Fe2O3 , decreasing the grain size of Fe2O3 ,
increasing the sulfation temperature or decreasing the
calcination temperature . The reason for the enhancement of
adsorption of SO2 by MgCO3 with Fe2O3 is probably due to the
catalytic effect of Fe2O3 on the oxidation of SO2 to form SO3
which is more easily captured than SO2 by MgO .
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