The selective catalytic reduction (SCR) technique that converts NOx from the outlet of industrial boilers at low temperature (<200 °C) requires catalysts that possess both the oxidization property ...

Improved Activity and SO2 Resistance by Sm-Modulated Redox of MnCeSmTiOx Mesoporous Amorphous Oxides for Low-Temperature NH3-SCR of NO

Currently, improving the alkali resistance of vanadium-based catalysts still remains as an intractable issue for the selective catalytic reduction of NOx with NH3 (NH3-SCR). It is generally believe...

Alkali-Resistant NOx Reduction over SCR Catalysts via Boosting NH3 Adsorption Rates by In Situ Constructing the Sacrificed Sites.

Application of ReOx/TiO2 catalysts with excellent SO2 tolerance for the selective catalytic reduction of NOx by NH3

Insights into samarium doping effects on catalytic activity and SO2 tolerance of MnFeO catalyst for low-temperature NH3-SCR reaction

Insight into the activity and SO2 tolerance of hierarchically ordered MnFe1-δCoδOx ternary oxides for low-temperature selective catalytic reduction of NOx with NH3

A novel Ti-doped Sm-Mn mixed oxide (TiSmMnOx) was first designed for the selective catalytic reduction (SCR) of NOx with NH3 at a low temperature. The TiSmMnOx catalyst exhibited a superior catalytic performance, in which NOx conversion higher than 80% and N2 selectivity above 90% could be achieved in a wide-operating temperature window (60-225 °C). Specially, the catalyst also showed high durability against the large space velocity and excellent SO2/H2O resistance. Ti incorporation can efficiently inhibit MnOx crystallization and tune the MnOx phase during calcination at a high temperature. Subsequently, a high specific surface area as well as an increased amount of acid sites on the TiSmMnOx catalysts were produced. Further, the reducibility of the Sm-doped MnOx catalyst was modulated, facilitating NO oxidation and inhibiting NH3 nonselective oxidation. Consequently, a superior SCR activity was achieved at a low temperature and the operating temperature window of the TiSmMnOx catalyst was significantly widened. These findings may provide new insights into the reasonable design and development of the new non-vanadium catalysts with a high NH3-SCR activity for industrial application.

Titania-Samarium-Manganese Composite Oxide for the Low-Temperature Selective Catalytic Reduction of NO with NH3

The invention relates to a manganese-based composite oxide catalyst for selectively reducing NOx by ammonia with high thermal stability and high low-temperature activity and a preparation method thereof. The catalyst can be applied to purification of NOx in flue gas from factories and vehicle tail gas. The catalyst is prepared with manganese oxide as an active component and samarium and other transit metals as cocatalysts, thus forming the ternary metal composite oxide catalyst. The catalyst is used for a reaction of selectively catalytically reducing NOx by ammonia and has very wide temperature window at a low temperature. After being roasted at 500-650 DEG C, the catalyst can reach more than 80% in NOx removal rate in a temperature range of 50 to 300 DEG C. The catalyst also has strong anti-water and anti-sulfur-poisoning capability. The preparation method is simple and low-cost, and has excellent application prospect.

Fang Zhilin

Papers

Titania-Samarium-Manganese Composite Oxide for the Low-Temperature Selective Catalytic Reduction of NO with NH3

Catalyst for selectively reducing NOx by ammonia with high thermal stability and preparation method thereof