Effects of arsenic oxide (As2O3) on the phase composition of vanadium pentoxide-molybdenum trioxide-titanium dioxide (anatase) DeNOx catalysts

Molecular Transformations of Arsenic Species in the Flue Gas of Typical Power Plants: A Density Functional Theory Study

“…Arsenic in air brings harmful toxicological impacts and is thought to be a hazardous air pollutant. The arsenic compounds condensed on the SCR catalyst greatly degrade the NO conversion of the catalyst, as reported by several researchers. − …”

Influence of Calcination Temperature over Vanadium–Molybdenum Catalysts for the Selective Catalytic Reduction of NOx with NH3

“…Notably, MoO 3 demonstrates preferable DeNO x activity compared with WO 3 , particularly at temperatures equal to or below 300 °C. Furthermore, it was reported that MoO 3 confers significant resistance to arsenic poisoning during actual combustion processes, and this finding underscores the potential of MoO 3 as an effective component in enhancing the performance and durability of SCR catalysts, particularly in environments containing arsenic impurities . Among the above-mentioned oxide materials, MoO 3 as a promoter in the V 2 O 5 /TiO 2 catalyst can dramatically enhance the SCR activity as well as SO 2 resistance.…”

“…Furthermore, it was reported that MoO 3 confers significant resistance to arsenic poisoning during actual combustion processes, and this finding underscores the potential of MoO 3 as an effective component in enhancing the performance and durability of SCR catalysts, particularly in environments containing arsenic impurities. 24 Among the above-mentioned oxide materials, MoO 3 as a promoter in the V 2 O 5 /TiO 2 catalyst can dramatically enhance the SCR activity as well as SO 2 resistance. Moreover, Xu et al 25 have conducted a study on the sulfur tolerance of V 2 O 5 / TiO 2 catalysts modified with MoO 3 and WO 3 , and they found that Mo has better SO 2 resistance compared to traditional W. Although MoO 3 -doped V 2 O 5 /TiO 2 catalysts have been extensively reported, such as the impact of the V/Mo mole ratio, 26,27 the V/Mo preparation method, 28,29 vanadium precursors, 8 and doping of other substances into V 2 O 5 − MoO 3 /TiO 2 catalysts, 18,30 no one has focused on the impact of calcination temperature on catalytic activity along with the analysis of an influencing mechanism.…”

New insights into the deactivation mechanism of V2O5-WO3/TiO2 catalyst during selective catalytic reduction of NO with NH3: synergies between arsenic and potassium species

“…Among these problems, deactivation is the restrictive factor for employing the catalyst, and alkali metals and arsenic poisoning are the two primary reasons responsible for it, based on previous studies. [5][6][7][8] Therefore, if it is intended to extend the life span of the catalyst and improve its service efficiency, the mechanism of catalyst deactivation resulting from these poisons should be rstly controlled, and only in that case the corresponding solutions could probably to be put forward.…”