SOx Abatement

As a supplier of catalyst and process technology, Applied Catalysts can help customers source catalysts and chemicals in many areas.

SOx Abatement & The EPRICON Process

Applied Catalysts worked via an agreement with Electric Power Research Institute to develop the EPRICON process to convert SO2 to SO3 to enhance flue gas fly ash removal specifically from a coal fired power plant when the boilers were burning low sulfur coal. The EPRICON process required the development of a fused silica honeycomb support for a vanadium pentoxide (V2O5) catalyst supporting EPRI’s US Patent #5,011,516, issued in April, 1991.


THE EPRICON PROCESS – Coals naturally contain a small percentage of sulfur, which becomes oxides of sulfur (SO2 and SO3) as the coal burns. Electrostatic precipitators (ESPs) are designed into a coal fired boiler’s flue system to remove fly-ash, using the level of SO3 produced during combustion of high (normal level) sulfur coal to condition, or control, the ash’s electrical resistivity so the ESPs are able to efficiently remove fly-ash. If utilities, under regulatory pressure, begin burning low sulfur coal to lessen their emission of oxides of sulfur, the amount of SO3 in the flue gas stream drops, rendering those ESPs ineffective in removing sufficient fly-ash from flue gas to keep stack emissions clear.


When coal is burned in a boiler, most of the sulfur it contains becomes SO2, sulfur dioxide, while a small percentage ends up as SO3, sulfur trioxide, 3% or less of the combined mix of oxides of sulfur. It is the SO3, not the SO2, which is effective in decreasing electrical resistivity of the fly ash so it can be removed from the flue gas by an ESP. Generally, older ESPs were originally designed to operate properly with the levels of SO3 coming from combustion of high sulfur eastern coals (1%+). Coal blends containing less than 1% sulfur produce less SO3 than required for proper ESP operation, resulting in boiler capacity limitations (de-rating) due to excessive stack fly ash emissions (opacity). In correction, EPRICON systems are used to convert (oxidize) a large portion of the unusable SO2 into usable SO3 in a small diverted side stream (slip stream) of boiler flue gas, which is then re-introduced into the main flue gas stream upstream of the ESP to raise the overall SO3 content of the flue gas stream back to design level, thereby producing a decrease in fly ash resistivity in the flue gas stream.

Contact Applied Catalysts regarding questions about the EPRICON process.

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Product Types for Emission Control

Activated Carbon Monolith

In chemical process applications, ACMC® catalysts can be used for continuous hydrogenation reactions in many areas where traditional GACC (granular activated carbon catalysts) are currently used.

Monolithic Catalysts

Our monolithic solutions include activated carbon, ceramic, and metallic catalysts that have great applications for engine emissions control and industrial air pollution.

Particulate Systems

Our particulate systems include extrudates, precious metal spheres and saddles for regenerative air pollution control.  Enjoy benefits like 95% heat recovery.


We offer unique designs, such as our ceramic honeycomb, that provides excellent benefits including high resistance to thermal shock and solid thermal mass for effective heat exchange.

Market Applications for Emission Control


Have another market application needing a catalytic system? Tell us about it, and let’s create something that gets the job done.


Partner with the best for Emissions Control Catalysts & Services

Applied Catalysts works with many suppliers across the globe. We can provide the following:

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    in-house validation capabilities

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    in-house and external catalyst supplier

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    connections with many manufacturers

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