THESIS
2009
xiii, 86 p. : ill. ; 30 cm
Abstract
Effective adsorbents for sulphur dioxide (SO
2) removal were investigated in this work. The conventional adsorbent for gas purification is normally operated at low temperature (below 200ºC), which is not suitable for the removal of SO
2 in hot flue gas. Pillared clays and calcined layered double hydroxides (LDHs), which have been widely studied for many catalytic applications at high temperature, are of a great potential for SO
2 removal from hot flue gas. In the current study, SO
2 adsorption performances of pillared clays and calcined LDHs were evaluated.
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Effective adsorbents for sulphur dioxide (SO
2) removal were investigated in this work. The conventional adsorbent for gas purification is normally operated at low temperature (below 200ºC), which is not suitable for the removal of SO
2 in hot flue gas. Pillared clays and calcined layered double hydroxides (LDHs), which have been widely studied for many catalytic applications at high temperature, are of a great potential for SO
2 removal from hot flue gas. In the current study, SO
2 adsorption performances of pillared clays and calcined LDHs were evaluated.
Different metal species have been used to prepare pillared clays with bentonite as the supporting material. Ce and Zr pillared clays are found to have better SO
2 adsorption performance than other pillared clays. The SO
2 adsorption performance of pillared clay with different Ce and Zr content are also investigated. Several calcined LDHs with different Ce and Zr content are synthesized with Mg and Al as the major component. SO
2 adsorption performance of calcined LDHs with carbonate exchange and synthesized at higher pH are also investigated. It is found that Ce and Zr are active species for SO
2 adsorption, which have strong attractions to SO
2. Also calcined LDHs are found to have outstanding performance for SO
2 removal. The adsorption capacities of calcined LDHs are in average 100% higher than pillared clays and 300% higher than activated carbon and ZSM-5 at 200°C.
The current results have demonstrated that calcined LDHs can achieve high SO
2 adsorption capacities at high temperature. As the synthesis procedure of calcined LDHs is not complicated, with further development, calcined LDHs can be developed into effective adsorbents for industrial SO
2 removal.
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