What is it about?

This study investigated how the composition of liquefied petroleum gas (LPG) affects the performance of three-way catalysts in retrofitted heavy-duty spark-ignition engines. It found that the catalyst's performance is not significantly affected by LPG composition, as the catalyst can still achieve high conversion efficiency of carbon monoxide, unburned hydrocarbons, and nitrogen oxides, especially under rich conditions. Additionally, the study found that implementing λ pulse strategies can further improve catalyst performance and reduce ammonia formation to around 25 mg/kWh, while maintaining high catalyst conversion efficiency for all pollutant species. These findings suggest that LPG can be a viable alternative fuel for retrofitted engines and can contribute to cleaner transportation.

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Why is it important?

This study holds substantial importance for society by addressing critical environmental and societal challenges associated with vehicular emissions and sustainable transportation. By investigating the effects of LPG composition on emissions and catalyst performance in retrofitted engines, it offers a pathway to reduce pollution from older, less eco-friendly vehicles. As urban areas grapple with air quality issues and the health implications of high pollution levels, any research that can help mitigate these concerns is invaluable. The findings of this study not only emphasize the potential of LPG as a cleaner alternative but also underscore the adaptability and cost-efficiency of retrofitting, making it an accessible solution to improving air quality and reducing emissions in urban environments. Moreover, the social impact extends globally as cleaner and more efficient transportation options are sought after worldwide. Encouraging the use of LPG in retrofitting engines can serve as a model for sustainable practices and influence policies and industry practices in various regions. Ultimately, this research contributes to the broader mission of creating cleaner and more sustainable transportation systems, which is crucial for mitigating climate change and enhancing the quality of life for people in urban and rural areas alike.


The study's emphasis on the adaptability and cost-effectiveness of retrofitting engines with LPG is particularly noteworthy. It underscores the importance of not just developing new technologies but also leveraging existing infrastructure to achieve environmental goals. This approach has the potential to make eco-friendly transportation more accessible and affordable, which is essential for widespread adoption. Overall, as someone concerned about environmental issues, this paper gives me hope that we can take meaningful steps towards cleaner air and a greener planet by utilizing available resources and optimizing existing technologies.

Dr. Enrique José Sanchis
Universitat Politecnica de Valencia

Read the Original

This page is a summary of: Assessment of exhaust raw emissions and aftertreatment performance in a retrofitted heavy duty-spark ignition engine operating with liquefied petroleum gas, Journal of Cleaner Production, January 2024, Elsevier,
DOI: 10.1016/j.jclepro.2023.140139.
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