Emission of Toxic HCN During NO_x Removal by Ammonia SCR in the Exhaust of Lean-Burn Natural Gas Engines.

ABSTRACT: Reducing greenhouse gas and pollutant emissions is one of the most stringent priorities of our society to minimize their dramatic effects on health and environment. Natural gas (NG) engines, in particular at lean conditions, emit less CO₂ in comparison to combustion engines operated with liquid fuels but NG engines still require emission control devices for NO_x removal. Using state-of-the-art technologies for selective catalytic reduction (SCR) of NO_x with NH₃ , we evaluated the interplay of the reducing agent NH₃ and formaldehyde, which is always present in the exhaust of NG engines. Our results show that a significant amount of highly toxic hydrogen cyanide (HCN) is formed. All catalysts tested partially convert formaldehyde to HCOOH

SUBMITTER: Zengel D 

PROVIDER: S-EPMC7497226 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature