Towards understanding the genesis and removal of NOx in FCC regenerators

J. O. Barth, A. Jentys, J. A. Lercher

Research output: Contribution to conferencePaperpeer-review

9 Scopus citations


The regeneration of FCC catalysts leads to significant NO, emissions requiring the development of novel additives that catalyze in situ the reduction of NOx to N2 in the regenerator of the FCC unit to fulfill existing and anticipated logistic demands. Coke characterization was carried out using physicochemical techniques, i.e., IR and NMR spectroscope elemental analysis, and LD-/MALDI-TOF-MS spectroscopy. The surface chemistry during the FCC regeneration process was studied using TPD and oxidation experiments. From coke loaded spent FCC catalysts, NH3 and HCN were formed via pyrolysis at > 350°C. The amount of NH3 released was significantly influenced by the concentration of water in the samples. Higher water contents favored the formation of NH3, which supports the hypothesis that nitrogen containing aromatic compounds, e.g., pyridine could react to NH3 and CO2 via hydrolysis. TPO experiments indicated that polvaromatic derivatives of pyrrole (carbazole) are cracked to CO and HCN, which could be subsequently oxidized to NO.

Original languageEnglish
Number of pages15
StatePublished - 2002
EventProceedings of the 17th World Petroleum Congress - Rio de Janeiro, Brazil
Duration: 1 Sep 20025 Sep 2002


ConferenceProceedings of the 17th World Petroleum Congress
CityRio de Janeiro


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