Desulfurization Properties Research Articles

Multicyclic Study on Improved Zn/Ti-Based Desulfurization Sorbents in Mid-Temperature Conditions

Conventional zinc titanate sorbent was modified with cobalt oxide, nickel oxide, molybdenum oxide, and iron hydroxide in order to achieve the desirable reactivity and mechanical durability in mid-temperature ranges, and 100 repetitive cycles of sulfidation/regeneration were carried out to investigate its reactivity and attrition resistance. In the attrition tests for the improved sorbents, the results showed that the attrition resistance was 94.08% and that the sulfur capacity was 23 g of S/100 g of sorbent and 15 g of S/100 g of sorbent in the 3- and 100-cycle tests, respectively. The changes in the properties of the ZTG40 sorbent formulated in this study were also investigated with the aid of X-ray diffraction, scanning electron microscopy, Hg porosimetry, and Brunauer−Emmett−Teller surface area measurement during a 100-cycle test. From the analysis, it was concluded that ZTG40 has the desirable physical and chemical properties for desulfurization of coal fuel gases at medium temperatures and is suitabl...

99/03110 Effect of impurities on desulfurization properties of limestone during coal gasification

99/03110 Effect of impurities on desulfurization properties of limestone during coal gasification

Synthesis, Stability, and Sulfation Properties of Sol−Gel-Derived Regenerative Sorbents for Flue Gas Desulfurization

The sol−gel method is applied to prepare γ-alumina-supported copper oxide and calcium oxide sorbents containing 10−50 wt % active species. The prepared sorbents are characterized for their pore texture, dispersion of active species on the surface of support, and desulfurization properties. The sol−gel-derived alumina-supported sorbents have a relatively large surface area (>200 m2/g) and pore volume (>0.3 cm3/g) and uniform pore size distribution (20−60 A). Thermal and chemical stability of the sol−gel-derived sorbents is studied by comparing the pore texture data of the sorbents before and after several different heat treatments. The stability results show that the pore structure of the sol−gel-derived sorbents is stable in the normal conditions of the flue gas desulfurization process. It is found that CuO/γ-Al2O3 sorbent containing 20 wt % of CuO coated as a monolayer or submonolayer on the surface of support has the highest SO2 sorption capacity (22.5 wt % at 500 °C). The sol−gel-derived CuO/γ-Al2O3 so...