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

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Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas. / Tunå, Per; Brandin, Jan.

In: Fuel, Vol. 105, 2013, p. 331-337.

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TY - JOUR

T1 - Selective catalytic oxidation of ammonia by nitrogen oxides in a model synthesis gas

AU - Tunå, Per

AU - Brandin, Jan

PY - 2013

Y1 - 2013

N2 - Synthesis gas generated by the gasification of nitrogen-containing hydrocarbons will contain ammonia. This is a catalyst poison and elevated levels of nitrogen oxides (NOX) 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 NOX 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 NOX over a catalyst. The experiments were carried out in a model synthesis gas consisting of CO, CO2, H-2, N-2 and NH3/NOX. The performance of two catalysts, V2O5/WO3/TiO2 and H-mordenite, were evaluated. On-site generation of NOX 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 NOX. (C) 2012 Elsevier Ltd. All rights reserved.

AB - Synthesis gas generated by the gasification of nitrogen-containing hydrocarbons will contain ammonia. This is a catalyst poison and elevated levels of nitrogen oxides (NOX) 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 NOX 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 NOX over a catalyst. The experiments were carried out in a model synthesis gas consisting of CO, CO2, H-2, N-2 and NH3/NOX. The performance of two catalysts, V2O5/WO3/TiO2 and H-mordenite, were evaluated. On-site generation of NOX 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 NOX. (C) 2012 Elsevier Ltd. All rights reserved.

KW - SCR

KW - Synthesis gas

KW - V2O5/WO3/TiO2

KW - H-mordenite

KW - Ammonia removal

U2 - 10.1016/j.fuel.2012.08.025

DO - 10.1016/j.fuel.2012.08.025

M3 - Article

VL - 105

SP - 331

EP - 337

JO - Fuel

T2 - Fuel

JF - Fuel

SN - 1873-7153

ER -