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Catalytic Converter - Europe PMC

Summarized by Plex Scholar
Last Updated: 02 October 2022

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Effective emissions reduction of high-mileage fleets through a catalytic converter and oxygen sensor replacement program.

This report examines the success of a pilot repair service in Hong Kong, which account for approximately 21% of the total licensed vehicles. On transient chassis dynamometers, the emission factors of a large number of 684 in-service taxis were determined. The results revealed that 63 percent of the sampled taxis failed the driving cycle examination before the pilot repair service was introduced. The majority of failed taxis were NO related, and 91% of failed taxis exceeded the emission limits of at least two banned pollutants at the same time. According to a survey, these findings resulted in the establishment of a large-scale replacement scheme for all taxis in Hong Kong between 2013 and 2014, which was estimated to have minimized the total HC, CO, and NO emissions by about 420, 2570, and 1000 t per year, respectively.

Source link: https://europepmc.org/article/MED/35970469


Exhaust emissions from gasoline vehicles after parking events evaluated by chassis dynamometer experiment and chemical kinetic model of three-way catalytic converter.

Following 60 to 120 minutes of parking, exhaust emissions from most vehicles increased dramatically, including nitrogen oxides, and carbon monoxide, leading to higher levels than cold-start emissions, indicating the effect of parking duration on atmospheric pollutant emissions. Both the initial temperature of the three-way catalytic converter and the inlet engine gas temperature were important factors in causing exhaust emissions after parking; therefore, proper monitoring to minimize air pollution after middle-term parking durations should be implemented to minimize air pollution.

Source link: https://europepmc.org/article/MED/35882335

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions