Article
Chemistry, Physical
Paolo Sementa, Jacson Beltrao de Vargas Antolini, Cinzia Tornatore, Francesco Catapano, Bianca Maria Vaglieco, Jose Javier Lopez Sanchez
Summary: This study investigates the performance and emissions of a single-cylinder SI engine operating under lean-burn hydrogen combustion and compares it to methane under similar conditions. The results show that hydrogen combustion achieves stable combustion with lower pollutant emissions and higher efficiency, making it a promising clean fuel to replace conventional fuels.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Jianbing Gao, Guohong Tian, Chaochen Ma, Yuanjian Zhang, Shikai Xing, Phil Jenner
Summary: Lean-burn was adopted as an effective method in this study to reduce NOx emissions from hydrogen combustion in ORP engines. The equivalence ratio has a significant impact on combustion and NOx emission characteristics, with effects varying with engine speeds. High NOx emissions were observed under low engine speed conditions due to hydrogen combustion near stoichiometric ratio.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
You Zhou, Wei Hong, Fangxi Xie, Yan Su, Zhongshu Wang, Yu Liu
Summary: In order to address the energy and environmental issues, the development of new technologies and alternative fuels has gained attention. This study investigated the impact of different valve lift adjustment strategies on engine performance when fueled with methanol/gasoline blending. The results showed that adjusting intake and exhaust valve lifts could improve economy performance and reduce emissions. The optimal valve strategy varied depending on the fuel composition. The blending of methanol with gasoline extended the lean burn limit and further improved engine performance.
Article
Chemistry, Multidisciplinary
Byung Hee Ko, Bjorn Hasa, Haeun Shin, Yaran Zhao, Feng Jiao
Summary: This research demonstrates a method of reducing gaseous NOx emissions at ambient temperatures through an electrochemical pathway. The study found that copper has a high selectivity towards NH3 formation, and a high NO coverage facilitates the N-N coupling reaction. This work provides a promising avenue for reducing gaseous NOx emissions at ambient conditions using renewable electricity.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Gu Xin, Changwei Ji, Shuofeng Wang, Hao Meng, Ke Chang, Jinxin Yang
Summary: This experimental study investigates the suppression of heat release rate in a hydrogen-fueled engine through the addition of ammonia. The results show that adding small amounts of ammonia decreases the combustion rate, prolongs flame development and propagation durations, reduces pressure and heat release rate peaks, and increases peak effective pressure and thermal efficiency. However, it also leads to increased nitrogen oxide emissions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Wenyu Xiong, Jie Ye, Qichangyi Gong, Han Feng, Jinbang Xu, Anwen Shen
Summary: The study proposes a multi-input model predictive speed control strategy for lean-burn natural gas engines in a range extender, aiming to improve the system's responsiveness and anti-disturbance capability by introducing an air-fuel ratio (AFR) additional torque. The approach effectively addresses the challenges of insufficient engine torque and degraded performance in engine speed tracking systems.
Article
Energy & Fuels
B. Karpanai Selvan, Soni Das, M. Chandrasekar, R. Girija, S. John Vennison, N. Jaya, P. Saravanan, M. Rajasimman, Yasser Vasseghian, N. Rajamohan
Summary: The study investigates the performance and emission characteristics of various biomass blends in a diesel engine. The results show that the AO10D blend performs well with higher thermal efficiency and lower emissions at 50% load.
Article
Environmental Sciences
Yasir Hussain Siddiqui, Muhammad Shakaib, Adnan Rasheed, Hafiz Muhammad Ali, Syed Mohammad Rizwan Azeem, Athar Husain Siddique, Muhammad Shafiq
Summary: The present study investigates the effectiveness of graphite and iron oxide nanofuel additives on exhaust emissions and performance of a gasoline engine. Results show that graphite blends have higher brake power, brake thermal efficiency, and torque, as well as lower brake-specific fuel consumption, NOx, and CO2 emissions compared to iron oxide blends. However, graphite blends produce more CO and HC emissions. Overall, graphite nanoparticles are more engine and environment friendly than iron oxide fuel additives.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Shiyi Pan, Jinhua Wang, Zuohua Huang
Summary: This study compared the effects of four different hydrogen injection strategies on the distribution, combustion, and emissions of hydrogen mixtures. The results showed that different hydrogen injection strategies resulted in different types of hydrogen mixture distribution. Adjusting the hydrogen injection strategy can optimize the engine's combustion and emission performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Applied
M. Mehne, S. Kureti
Summary: A systematic investigation of commercial alpha-Fe2O3 catalysts for the treatment of gas engine exhaust emissions was conducted. The study found that the number of active Fe sites and the availability of surface and subsurface oxygen are crucial properties for the oxidation of CH4, while the conversion of CH2O is driven by the CO2 adsorption capacity and the amount of OH surface species.
TOPICS IN CATALYSIS
(2023)
Article
Green & Sustainable Science & Technology
Jianbing Gao, Guohong Tian, Chaochen Ma, Shikai Xing, Liyong Huang
Summary: Opposed rotary piston engines have high power density and can be used as an ideal power source for hybrid vehicles and range extended electric vehicles. Hydrogen applications can demonstrate the advantages of these engines but worsen nitrogen oxides emissions. Lean-burn was adopted in this investigation to achieve low nitrogen oxides emissions, with results showing that engine speed of 3000 r/min had the highest in-cylinder pressure during combustion and significant increase in heat loss rates through cylinder walls with engine speed.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Wenjing Hu, Ping Zhang, Ling Zhao, Zetian Tao
Summary: LSCF nanofibers synthesized through electrospinning were used as impregnation substrates to successfully enhance the performance of solid oxide fuel cells. The impregnation of BBF in the LSCF substrate led to a significant improvement in cell performance, indicating the potential of this technique for further advancements in fuel cell technology.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Changzhao Jiang, Chongming Wang, Hongming Xu, Haoye Liu, Xiao Ma
Summary: The study found that employing the stratified lean-burn mode in spark-ignition engines can significantly improve fuel economy, with up to a 16% increase if the second injection timing is optimized. The second injection timing also has significant impacts on IMEP, combustion duration, COV, gaseous emission, and particulate number emissions.
Article
Thermodynamics
Kai Shen, Zishun Xu, Hong Chen, Jiakun Du
Summary: High energy ignition can enlarge the lean-burn limit, but has no significant effect on combustion stability. On the other hand, high tumble can effectively improve fuel economy.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2021)
Article
Thermodynamics
Idris Cesur
Summary: The use of alternative fuels is effective in reducing pollutant emissions from spark-ignition engines. However, water injection during combustion can further reduce emissions and improve engine performance. In this study, a gasoline-methanol blend was used as the fuel and water injection was applied at different rates. The results show that water injection can decrease HC and NOx emissions while also increasing the effective power of the engine.