Selective reduction of nitrogen oxides (NOx) by ammonia over honeycomb selective catalytic reduction catalysts

Mesoporous Fe-containing ZSM-5 zeolite single crystal catalysts for selective catalytic reduction of nitric oxide by ammonia

“…Diffusion often limits the activity of the catalysts especially at high reaction rates, which are usually observed in NO SCR with NH 3 . In the case of traditional vanadia-based catalysts, the SCR reaction is strongly limited by gas-solid interface mass transfer and by slow intraparticle diffusion [8,9]. This ismost probably also the case for the Fe-ZSM-5 zeolite catalysts with channel dimensions within the range of small molecules.…”

Effect of SO2 on a cordierite honeycomb supported CuO catalyst for NO reduction by NH3

“…4. The competitive adsorption between SO 2 and NH 3 may prevent transformation of CuO to CuSO 4 . As a result, the catalysts sulfated in the presence and absence of NH 3 show different SCR activities.…”

“…The worldwide trend towards the increasingly stringent emission levels has spurred research and development on cost-effective technologies capable of reducing NO x emission. Among them, selective catalytic reduction (SCR) of NO with NH 3 in the presence of oxygen is proven to be advantageous [1,2], and honeycomb V 2 O 5 /TiO 2 has been used for this process in industries due to its high activity and low flow resistance [3,4]. However, porous titania in anatase form required in the current practice was reported to be both difficult to prepare and physically weak [5].…”

Increased co-oxidation activity for mercury under hot and cold site coal power plant conditions – Preparation and evaluation of Au/TiO2-coated SCR-DeNOx catalysts

“…In commercial practice in power plants most SCR reactors are hot-side, high dust installations. The SCR technology is based on the reduction of nitrogen oxide (NO) with ammonia (NH 3 ) [8]. In a side reaction, SCR catalysts are known to convert sulphur dioxide (SO 2 ) to sulphur trioxide (SO 3 ) .…”