Jhang, Syu-Ruei張頊瑞

Research Interests

My research interests are mainly focusing on energy and environment. In terms of the amount of fossil fuel available globally, the increasing demand for energy have led to a sharp rise in fuel prices. Environmental problems and energy security are both global concerns. Thus, developing alternatives to the traditional fossil fuels are very important, and both feature routinely in public policy discourses around the world.

There are different kinds of alternative fuels on various applications (e.g., alcohols, dimethyl ether (DME), hydrogen, biodiesels, liquefied natural gas (LNG), etc.). New types of fuel blend strategies on vehicles had been announced in many countries. Since the fuel blends involve different fuel types which may have negative effects on the engine performance, equivalence ratio and energy consumption after the usage. Also, it is necessary to study their GHGs emissions of road transport, vehicle model, driver behavior and traffic-related air pollutants. The identification will help us to pinpoint the contribution of total environmental load, potential environmental impacts, policy implications and further analysis of green transportation.

Representative Publications

Syu-Ruei Jhang, Yi-Ying Chen, Yo-Jin Shiau, Chia-Wei Lee, Wei-Nai Chen, Chih-Chung Chang, Chih-Feng Chiang, Horng-Yuh Guo, Pao-Kuan Wang, Charles C.-K. Chou*.(2022). Denitrifiers and Nitrous Oxide Emissions from a Subtropical Vegetable Cropland. ACS Earth and Space Chemistry. Accept. DOI:10.1021/acsearthspacechem.2c00106

Yuan-Chung Lin, Sheng-Lun Lin, Syu-Ruei Jhang*, Kang-Shin Chen,*. chaio-Wen Su, Chien-Er Huang (2022). Energy Saving and Pollutant Emission Reduction by Adding Hydrogen in a Gasoline-fueled Engine. Aerosol and Air Quality Research. DOI:org/10.4209/aaqr.220259

Feng-Chih Chou, Syu-Ruei Jhang, Sheng-Lun Lin, Chung-Bang Chen, Kang-Shin Chen,Yuan-Chung Lin*. (2022). Emission reduction of NOx,CO, HC, PM2.5 and PAHs by using a catalyst in a diesel engine. Aerosol and Air Quality Research 22, 220180. DOI:10.4209/aaqr.220180

Yuan-Chung Lin, Syu-Ruei Jhang*, Sheng-Lun Lin*, Kang-Shin Chen. (2021). Comparative effect of fuel ethanol content on regulated and unregulated emissions from old model vehicles: An assessment and policy implications. Atmospheric Pollution Research 12, 4, 66-75(*: corresponding author). DOI:10.1016/j.apr.2021.02.014

Syu-Ruei Jhang, Yuan-Chung Lin*, Kang-Shin Chen, Sheng-Lun Lin, Stuart Batterman. (2020). Evaluation of fuel consumption, pollutant emissions and well-to-wheel GHGs assessment from a vehicle operation fueled with bioethanol, gasoline and hydrogen. Energy 209, 118436. DOI:10.1016/j.energy.2020.118436

Yuan-Chung Lin*, Feng-Chih Chou, Ya-Ching Li, Syu-Ruei Jhang*, Sumarlin Shangdiar. (2019). Effect of air pollutants and toxic emissions from various mileages of motorcycles and aerosol related carcinogenicity and mutagenicity assessment. Journal of Hazardous Materials 365, 771-777 (*: corresponding author). DOI: 10.1016/j.jhazmat. 2018.11.056

Ken-Lin Chang, Kassian T. T. Amesho, Yuan-Chung Lin*, Syu-Ruei Jhang, Feng-Chih Chou, Hua-Chun Chen. (2019). Effects of atmospheric-plasma system on energy efficiency improvement and emissions reduction from a diesel engine. Journal of Environmental Management 234, 336-344. DOI:10.1016/j.jenvman. 2019.01.017

Syu-Ruei Jhang, Kang-Shin Chen, Sheng-Lun Lin, Yuan-Chung Lin*, Kassian T. T. Amesho, Chung-Bang Chen. (2018). Evaluation of the reduction in carbonyl emissions and ozone formation potential from the exhaust of a heavy-duty diesel engine by hydrogen-diesel dual fuel combustion. Applied Thermal Engineering 132, 586-594. DOI: 10.1016/j.applthermaleng.2017.12.126

Syu-Ruei Jhang, Kang-Shin Chen, Sheng-Lun Lin, Yuan-Chung Lin*, Way Lee Cheng. (2016). Reducing pollutant emissions from a heavy-duty diesel engine by using hydrogen additions. Fuel 172, 89–95. DOI: 10.1016/j.fuel.2016.01.032


Current Research-Reactive nitrogen species including ammonia (NH3), oxides of nitrogen (NOx = NO + NO2), nitrous acid (HONO) and nitric acid (HNO3) are known as the major photochemical precursors of PM2.5 and/or ozone in the atmosphere. Considering the extremely high density of N-fertilizers applied to agricultural soils in Taiwan, this study hypothesizes that emission of reactive nitrogen species from fertilized soils is substantial and responsible to a certain degree for the unusually high levels of nitrate aerosols and ozone over the agricultural areas. Therefore, this study aims at helping resolve the paradox of air pollution in the agricultural areas of Taiwan. This is the first study upon the impacts of agricultural fertilization to air quality in Taiwan, and the results will provide a strong scientific base for the formulation of an effective strategy for air quality improvement in agricultural areas. Reference: [1] 2019 Sustainability Science Research Program, Academia Sinica.

Alternative Fuels and Power for Vehicles -Most of transportation energy utilization was related with petroleum and other liquid fuels. The emissions from vehicle exhausts not only have harmful effects on human health, but also indirectly contribute to climate change. My previous work has investigated the engine combustion, emission characteristics of alternative fuels (including hydrogen, biofuels) over United States / European driving cycle and also discusses their impact on engine performance, energy consumption, GHGs emissions of road transport. One particular area was health risk assessment of aerosol carcinogenicity and mutagenicity emitted by in-use vehicles. The exposures from toxic compounds (PAHs, CBCs) are associated with vehicles emissions during incomplete combustion, which influences respiratory allergy and the risk of lung cancer, especially in high density transportation countries. References: [1] Lin et al., Journal of Hazardous Materials 365 (2019) 771-777; [2] Jhang et al., Appl. Therm. Eng. 132 (2018) 586–594; [3] Jhang et al., Fuel 172 (2016) 89–95 [4] Jhang et al., Int. J. Hydrog. (Preparing for Submission)

Well-to-Wheel Life Cycle Assessment-Another major area of my study was energy Life Cycle Assessment (LCA). The well-to-wheel LCA assessment is utilized by using Greenhouse gases, Regulated Emissions, and Energy use in Transportation model (GREET). New Bi-fuel vehicles such as bioethanol, biodiesel, natural gas (CNG), Liquefied petroleum gas (LPG), or hydrogen are expected to contribute to energy conservation due to the reduction in the fuel consumption. By combining practical vehicle test results and model simulation to pinpoint the contribution of total environmental load can help to figure out the potential environmental impacts with respect to their specific fuel pathway. References: [1] Jhang et al., Energy (2020).

  • Ph.D.
    Institute of Environmental Engineering
    National Sun Yat-sen University, Taiwan (2018)
  • Visiting Scholar.
    Department of Environmental Health Sciences
    School of Public Health, University of Michigan, Ann Arbor, USA (2017)
  • B.A.
    Department of Environmental science and Engineering
    National Pingtung University of Science and Technology, Taiwan (2012)
  • (02) 2787-5880

  • sjhang