Successful startup of first TertiNOx catalyst reference to reduce harmful NâO and NOx 1/14/2021 Haldor Topsoe and Proton Ventures BV announced a successful startup of the first TertiNOx⢠catalyst reference at Kavala Fertilizers, one of the largest nitric acid producers in Greece. Topsoe has supplied both catalyst and basic engineering for the project. The plant has already exceeded its design conversion with NâO emissions below 10 ppm, low ammonia slip, and practically eliminated NOx emissions. Before and after â the NOx plume was clearly visible Kavala Fertilizers' site before the installation of TertiNOxâ¢. âWith the new deNOx and NâO removal system, we are very proud to be able to outperform the current Best Available Technologies achieving extremely low emission levels,â says Dr. Theodora Kouloura, COO, Kavala Fertilizers LTD.