Investigation of an ammonium carbamate–based SCR system for NOx reduction in diesel engines under transient conditions

Raza, Hassan; Woo, Sang-Hee; Kim, Hongsuk

doi:10.1016/j.energy.2022.123918

Cited by 17 publications

(3 citation statements)

References 33 publications

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“…It was determined that the system was capable of reducing NOx emissions by more than 80%-90% across the FTP72 and US06 transient cycles. Also, Raza et al 41 investigated the AC-based SCR system for diesel engine NOx reduction under transient cycles. The deNOx performance of the system was evaluated and compared with state-of-the-art UWS systems under the world harmonized transient cycle (WHTC) and non-road transient cycle (NRTC).…”

Section: Ammonium Salts-based Solid Scr Technologymentioning

confidence: 99%

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A review of solid SCR systems as an alternative for NOx reduction from diesel engines

Raza,

Woo,

Kim

2023

International Journal of Engine Research

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Several NOx reduction technologies have been developed to alleviate the impact of NOx emissions on the environment and meet the more stringent upcoming emission legislation. Although UWS is the most commonly used NOx reduction technology, it has various issues listed in this article. Several alternative technologies based on solid materials as a gaseous ammonia source are developed to eradicate these issues. This article reviewed the solid SCR systems currently being developed as an alternative to UWS for deNOx applications. Furthermore, the chemistry of the various ammonia storage materials used in these systems and their potential to produce gaseous ammonia for use in SCR have been evaluated. Furthermore, the deNOx performance of ammonium salts-based and metal ammine chlorides-based solid SCR systems have been evaluated. Besides, we have discussed various numerical modeling and simulation approaches applied to develop these solid SCR systems. Due to gaseous ammonia injection solid SCR systems offer better NOx conversion efficiency compared with UWS systems, especially at low exhaust gas temperatures. The authors believe this article will be helpful for future studies in this field to further develop and establish these solid SCR systems as a viable alternative deNOx technology.

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Section: Ammonium Salts-based Solid Scr Technologymentioning

confidence: 99%

“…The effect of injection threshold temperature (T inj ) on the NOx conversion efficiency of AC-based solid SCR system 41. …”

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confidence: 99%

A review of solid SCR systems as an alternative for NOx reduction from diesel engines

Raza,

Woo,

Kim

2023

International Journal of Engine Research

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“…As an important part of emission control against diesel trucks, the selective catalytic reduction (SCR) system was proven to effectively reduce NOx emissions [14,15] but also enhance the formation of ammonia-induced particles [16][17][18][19][20]. The NOx reduction effectiveness of the SCR can be influenced by factors such as the driving condition [15], fuel quality, urea injection [21], etc.…”

Section: Introductionmentioning

confidence: 99%

Impact of Illegal Application of Urea Regulator on Real-World Exhaust Nitrogen Oxygen and Particle Number Emissions

Fang

Yang

et al. 2022

Atmosphere

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Urea regulators (UR) have generally been employed against diesel trucks to save urea usage and thus contribute to the reduction in excessive emissions, while their usage is generally difficult to supervise and enforce. By conducting real driving emission measurements on a China IV heavy-duty diesel truck, a “trade-off” effect caused by UR was found between nitrogen oxides (NOx) and particle number (PN) emissions. The usage of UR contributes to 1.04 times higher NOx but 0.28 times lower PN emissions for the whole trip. In particular, the increasing effects on NOx are most efficient on the highway and least effectual on the urban road, while the decreasing effects on PN exhibit an opposite trend under different road types. From low- and medium- to the high-speed bin, the peak average vehicle-specific power NOx emission rates exhibit markedly increasing but slightly decreasing trends for the truck with and without UR, respectively. Furthermore, the NOx emissions in units of CO2 and the linear correlational relationship between CO2 and NOx instantaneous mass emission rates, especially those on the highway, are significantly enhanced. This study directly clarifies the effects of UR on real-world emissions, providing a scientific basis for the real-time identification of the malfunction of the selective catalytic reduction system.

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Nitrogen Oxide Emissions in Ammonia Combustion

Mashruk,

Shi,

Zitouni

et al. 2024

Energy, Environment, and Sustainability

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Investigation of an ammonium carbamate–based SCR system for NOx reduction in diesel engines under transient conditions

Cited by 17 publications

References 33 publications

A review of solid SCR systems as an alternative for NOx reduction from diesel engines

A review of solid SCR systems as an alternative for NOx reduction from diesel engines

Impact of Illegal Application of Urea Regulator on Real-World Exhaust Nitrogen Oxygen and Particle Number Emissions

Nitrogen Oxide Emissions in Ammonia Combustion

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