Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas

Abstract

PostprintThis is the accepted version of a paper published in Fuel. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Tuna, P., Brandin, J. (2013) Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas. Fuel AbstractSynthesis gas generated by the gasification of nitrogen-containing hydrocarbons will contain ammonia. This is a catalyst poison and elevated levels of nitrogen oxides (NO X ) will be produced if the synthesis gas is combusted. This paper presents a study of the selective oxidation of ammonia in reducing environments. The concept is the same as in traditional selective catalytic reduction, where NO X are removed from flue gas by reaction with injected ammonia over a catalyst. Here, a new concept for the removal of ammonia is demonstrated by reaction with injected NO X over a catalyst. The experiments were carried out in a model synthesis gas consisting of CO, CO 2 , H 2 , N 2 and NH 3 /NO X . The performance of two catalysts, V 2 O 5 /WO 3 /TiO 2 and H-mordenite, were evaluated. On-site generation of NO X by nitric acid decomposition was also investigated and tested. The results show good conversion of ammonia under the conditions studied for both catalysts, and with on-site generated NO X .

Towards practical application of gasification: a critical review from syngas and biochar perspectives

“…Traditionally, NH3 can be removed using a water scrubber or a flue gas condenser due to its water solubility. However, this method incurred extra operating costs because the product gas needs to be cooled down and NH3 in the process water still needs to go through further treatment (Tunå & Brandin, 2013). A variety of catalysts (e.g., Ni-, Ru-, Fe-, and W-based)…”

“…Selective catalytic reduction was also applied and NH3 was selectively oxidized with injected NOX over a catalyst (V2O5/WO3/TiO2 or H-mordenite) (Tunå & Brandin, 2013). Over 90%…”

Degradation of Volatile Organic Compounds with Catalysts-Containing Zeolite and Ordered Mesoporous Silica

“…The catalytic activity of CeO 2 has also been attributed to its ability to store oxygen. Therefore, the incorporation of CeO 2 thus improves the performance of the redox catalyst, besides acting as a stabilizer of O 2 on the surface of the material [40][41][42].…”