Catalytic reduction of SO2 over supported transition-metal oxide catalysts with C2H4 as a reducing agent

Selection of best impregnated palm shell activated carbon (PSAC) for simultaneous removal of SO2 and NOx

“…This is because the concentration of NO (500 ppm) is much lower compared to SO 2 (2000 ppm). Furthermore the difference could be also due to characteristic nature and the reaction mechanism of pure PSAC, PSAC sorbents and the reactivity of the metal oxides themselves [20,21]. This concludes that pure PSAC without the help of metal catalyst could only adsorb SO 2 gas.…”

Selection of metal oxides in the preparation of rice husk ash (RHA)/CaO sorbent for simultaneous SO2 and NO removal

“…This result also suggested that the metal oxides on the RHA/CaO sorbents act as active sites for the SO 2 and/or NO sorption. It has been reported that transition metal oxides support Ca-based sorbents by playing a catalytic role in providing active sites for the sorption of SO 2 and NO gases [14,15,[31][32][33][34]. Besides, SO 2 and NO might also compete for the same active sites on the RHA/CaO sorbents [11,33,35].…”

Sulfur Evolution Reaction during Reduction of SO2 with CO over Carbon Materials

“…9 However, high reaction temperature and long gas−solid reaction time can bring about high energy consumption. 10 Moreover, the C−SO 2 reaction is difficult to control owing to a large difference in properties between various carbon materials, complex side reactions, and inevitable generation of toxic byproducts such as CO, COS, CS 2 , and H 2 S. 5,11 Gaseous reductants, such as CO, 12 H 2 , 1313 and hydrocarbons, 14,15 can also reduce SO 2 to elemental sulfur. As these gaseous reducing agents lead to extreme reaction conditions during SO 2 reduction, the reduction reactions need to rely on catalysts.…”