Removal of sulfur dioxide by fly ash/CaO/CaSO4 sorbents

Fabrication of Multifunctional Hybrid Composites Using Fly Ash to Control Environmental Pollutants: A Review

“…Many researchers have reported that blending FA with Ca(OH)2 or CaO can produce an adsorbent via a hydration process with a better SO2 reduction than that of hydrated lime [145][146][147]. Lee et al [148] found similar results, as shown in Figure 13. An adsorbent composed of a mixture of FA/CaO/CaSO4 was successfully synthesized with a higher SO2 adsorption capacity than that of pure FA, CaSO4, and CaO, due to its larger specific surface area (64.5 m 2 /g).…”

“…(a) Desulfurization activity of different adsorbents and (b) relationship between desulphurization capacity and specific surface area [148]. …”

Evaluation of various additives on the preparation of rice husk ash (RHA)/CaO-based sorbent for flue gas desulfurization (FGD) at low temperature

“…Previously, we have reported the preparation of siliceous/calcium dry-type sorbents prepared from coal fly ash [6,7], oil palm ash [8,9] and rice husk ash [10]. It was found that, those prepared sorbent have higher SO 2 sorption capacity (SSC) relating to higher surface areas due to the fact that coal fly ash, oil palm ash and rice husk ash are a pozzolanic material (mainly consist of SiO 2 /Al 2 O 3 ).…”

Cerium impregnated palm shell activated carbon (Ce/PSAC) sorbent for simultaneous removal of SO2 and NO—Process study

“…There are a number of technologies available to remove these gaseous pollutants. The literatures show that calcium based flue gas desulfurization, selective catalytic reduction (SCR) by NH 3 and CuO/Al 2 O 3 -based catalysts are the most effective technologies for SO 2 or NO removal [2][3][4][5]. However in order to lower the capital cost of equipment and operating cost, it is desirable to remove SO 2 and NO simultaneously in a single unit with a cheap sorbent.…”