One way to reduce such emissions is the catalytic conversion to the harmless gases nitrogen and water. Clariant provides the EnviCat NOx series catalysts for these applications. These catalysts are available in bulk and honeycomb forms, and can be used across a wide range of operation conditions.
The EnviCat NOx series is based on transition metal exchanged zeolites, which enable high-performance operation thru a broad temperature range. VWT based EnviCat NOx Yellow for the middle temperature range, Zeolite based EnviCat NOx Blue for low temperatures, and Zeolite based EnviCat NOx Red for higher temperatures.
The EnviCat NOx series have been developed for plants operating between 1 to 10 bar and in a high oxygen environment.
For conditions where SCR is not possible or not meaningful, EnviCat NSCR and EnviCat TWC catalysts can be applied.
Additionally, multiple-bed catalytic systems for the combined removal of VOC/CO and NOx can be provided by Clariant.
EnviCat NOx Blue and EnviCat NOx Red can be applied for the selective oxidation of ammonia to nitrogen and water (SCO) with only low formation of N2O and NOx. Typical application: Semiconductor industry.
EnviCat NOx Blue and EnviCat NOx Red catalysts are be operated at higher temperatures than conventional precious metal (PGM) based catalysts, they form mainly N2 with a selectivity typically above 90 %.