Heavy metal poisoning resistance of a Co-modified 3Mn10Fe/Ni low-temperature SCR deNOx catalyst

Abstract

Heavy metals have a great influence on the deNO x efficiency of catalysts. The 3Mn10Fe/Ni catalyst that used nickel foam (Ni) as the carrier, Mn and Fe as the active components, and Co as a trace auxiliary was prepared using an impregnation method. The catalysts poisoned by Pb or Zn and Co-modified catalysts with Pb or Zn poisoning were studied. The addition of Pb or Zn significantly decreases the deNO x activity of the 3Mn10Fe/Ni catalyst due to the decrease in the content of high-valence metal elements such as Fe 3+ and Mn 4+ , lattice oxygen concentration, reduction performance, acidity, and the number of acid sites. However, after Co modification, the deNO x activity of the poisoned catalysts can be improved effectively because the strong interaction between Pb or Zn and lattice oxygen is weakened, and the contents of lattice oxygen, high valence metal elements, reduction ability, and the number of acid sites increase.

Poisoning Mechanism Study of Metal Ions on a Three-Dimensional Ordered Macroporous Structure Ce0.2Mn0.2/3DOM-TiO2 Catalyst for Low-Temperature SCR of NO with NH3

“…3,13,14 The research status indicates that the antimetal ion ability of NH 3 −SCR catalysts can be improved via changing the chemical composition of the catalyst or adding auxiliary materials. 15,16 However, these research results still fall short of the target, susceptible to suffering from a low NO conversion rate at low temperatures and serious deactivation by multiple poisons. Further study is warranted to resolve the issue of low NO conversion rates at low temperatures.…”

“…Metal ions, including Cd, Pb, − Zn, , As, − and Hg, are usually present in industrial flue gas in either elemental or compound form. In the process of flue gas denitrification, metal ions through physical blocking or chemical reactions with catalysts result in catalyst poisoning and deactivation, which seriously affect the activity of catalysts. ,, The research status indicates that the antimetal ion ability of NH 3 –SCR catalysts can be improved via changing the chemical composition of the catalyst or adding auxiliary materials. , However, these research results still fall short of the target, susceptible to suffering from a low NO conversion rate at low temperatures and serious deactivation by multiple poisons. Further study is warranted to resolve the issue of low NO conversion rates at low temperatures.…”