SCR Catalyst (NOx Control Catalyst)

Selective catalytic reduction (SCR) systems work by chemically reducing NOx (NO and NO₂) to nitrogen (N₂). WFEC can offer coated and extruded catalysts. In a lean gas stream, it is necessary to add a reductant such as ammonia to the system to enable this reaction. Ammonia-SCR systems react ammonia (NH₃) with the NOx to form nitrogen (N₂) and water (H₂O). There are three reaction pathways:

• 4NH₃ + 4NO + O₂ → 4N₂ + 6H₂O
• 2NH₃ + NO + NO₂ → 2N₂ + 3H₂O
• 8NH₃ + 6NO₂ → 7N₂ + 12H₂O

Advantages:

• Low pressure drop
• High surface area
• Good consistency water absorption
• Low thermal expansion coefficient
• Good heat shock resistance and heat vibration resistance
• Ideal matching with various active catalyst components

Features

WFEC has developed SCR catalysts for meeting NOx emission control both of mobile and stationary applications. Depending on different application scene, WFEC can provide matched wash-coated products including Fe/zeolite (450~620 ^oC), Cu/Zeolite (190~550 ^oC), vanadium-based metal oxides (230~470 ^oC) and Mn-containing oxide catalysts (130~250 ^oC).

Applications

Boilers / Turbines

Diesel engine emissions

Engine systems for vessels

Industrial processes

Others (iron and steel making, coking plant and cement manufacturing)

Specifications

Square honeycomb SCR w/ or w/o NH₃-slip catalyst

   ---Cell desity:40/75/100/200/300 cpsi

   ---Size:150*150*100/150/200/250/300/400mm

Cylindrical honeycomb SCR w/ or w/o NH₃-slip catalyst

   ---Cell desity: 300/400/600 cpsi

   ---Size:(ϕ143.8~330.2mm)*(101.6~177.8mm)

Customer customization