Catalytic conversion of CO, NO and SO2 on the supported sulfide catalyst: I. Catalytic reduction of SO2 by CO

Resistance to sulfidation and catalytic performance of titanium–tin solid solutions in SO2+CO and NO+SO2+CO reactions

“…12 The TiO 2 -based catalyst shows high durability when it is used in the treatment of gas containing SO x (SO 2 , and SO 3 ), for instance, vanadia/TiO 2 catalysts for NO-SCR with ammonia [38], and NO storage-reduction catalyst for automotive exhaust [39]. The resistance of a TiO 2 -based catalyst to SO x comes from the chemical property of TiO 2 , which did not react with SO x at temperatures above 300 8C, namely sulfates of TiO 2 such as Ti(SO 4 ) 2 and TiO(SO 4 ) were not stable at the temperatures of interest [40]. The contact of H 2 S with TiO 2 would bring about sulfur deposition on the reactor wall and adsorbed H 2 S can desorb at about 150 8C [32].…”

“…There are two reactions responsible for this transformation. One is that CO in the flow reacts with tin sulfide to produce COS [4][5][6][7][8]; the other is that NO oxidized tin sulfide to produce SO 2 [24,41], which will be mentioned later. Both reactions deplete sulfur and the corresponding oxide (SnO) was formed.…”

“…Furthermore, the process is single-staged and easy to design and operate. Until now, alumina-supported transition metals and oxides [2][3][4], perovskite [5], and some oxide mixtures have been studied [6][7][8]. However, all such catalysts lost their structure under reaction conditions and turned into relative sulfides and/or oxysulfides which act as active phases.…”

Reduction of SO2 by CO under Plasma-assisted Catalytic System Induced by Microwave

“…A mixture of 10,000 ppm CO and 5000 ppm SO 2 in balanced helium was used as reactant. Because metal sulfide was the active species for this reaction [6,10], CoO/c-Al 2 O 3 was presulfided with the reactant mixture at 500°C for 2 h under conventional heating before reaction. The effluent gas passed through an ice-water trap, where elemental sulfur was condensed.…”

“…From this point of view, the catalytic reduction of SO 2 by CO to sulfur is desirable and has received much attention in recent years. Various types of catalysts have been investigated for this reaction under conventional furnace-heating, including alumina-supported transition metals [3][4][5][6][7], mixed oxides [8][9][10] and perovskite type oxides [11,12].…”