Performance impact and poisoning mechanism of arsenic over commercial V2O5–WO3/TiO2 SCR catalyst

Study of the V2O5-WO3/TiO2 Catalyst Synthesized from Waste Catalyst on Selective Catalytic Reduction of NOx by NH3

“…For the V 2 O 5 -WO 3 /TiO 2 catalyst, anatase TiO 2 acts as a carrier, V 2 O 5 is the active component, and WO 3 performs as the promoter to stabilize the catalyst and prevents the catalyst from sintering. In coal-fired power plants, the SCR catalyst suffers from gradual deactivation during the operation period because of poisoning, sintering, fouling, surface masking, attrition/crushing, and loss of vanadium or change in ratio value of the vanadium in different valence states [3][4][5][6][7][8].…”

What News in the Surface Chemistry of Bulk and Supported Vanadia Based SCR‐Catalysts: Improvements in their Resistance to Poisoning and Thermal Sintering

“…Arsenic in coal‐fired flue gas can stabilize as volatile As 2 O 3 and/or As 4 O 6 with concentration ranging from 1 μ g/m 3 to 10 μ g/m 3 and then contaminate the catalyst surface through the formation of dense layer of As 2 O 5 preventing ammonia adsorption . A schematic representation of surface reactions induced by arsenic poisoning is illustrated in Figure .…”

“…Arsenic in coal-fired flue gas can stabilize as volatile As 2 O 3 and/or As 4 O 6 with concentration ranging from 1 mg/m 3 to 10 mg/m 3 and then contaminate the catalyst surface through the formation of dense layer of As 2 O 5 preventing ammonia adsorption. [55,56] A schematic representation of surface reactions induced by arsenic poisoning is illustrated in Figure 12. Recent investigations showed that the deactivation is not related to a loss of specific surface area but more probably to the replacement of VÀOH hydroxyl groups by less acidic AsÀOH groups.…”

“…Schematic diagram of arsenic poisoning mechanism on V 2 O 5 ÀWO 3 /TiO 2 catalyst. Reproduced with permission from Ref [56]…”

Environment-friendly magnetic Fe–Ce–W catalyst for the selective catalytic reduction of NOx with NH3: influence of citric acid content on its activity-structure relationship

“…[1][2][3][4][5][6] Therefore, many technologies have been developed to reduce the emission of NO x from coal-red power plants. [7][8][9] Compared with other de-nitrogen technologies, the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) has drawn increasing attention due to its high efficiency. 7 V 2 O 5 -WO 3 (MoO 3 )/TiO 2 is widely used as an NH 3 -SCR catalyst due to its high NO x conversion and high anti-SO 2 poisoning.…”