Review
Chemistry, Multidisciplinary
Ioannis Yentekakis, Amvrosios G. Georgiadis, Catherine Drosou, Nikolaos D. Charisiou, Maria A. Goula
Summary: This paper reviews the SCR process of NOx on perovskite-based catalysts, focusing on the impact of different reducing agents and perovskite compositions. The correlation between physicochemical properties of the catalysts and their deNO(x) activity is also discussed. Proposed kinetic models provide insights into deNO(x) mechanisms and potential improvements in deNO(x) efficiency.
Article
Chemistry, Multidisciplinary
Heesoo Lee, Narankhuu Jamsran, Hongjae Kang, Dae Hoon Lee
Summary: This study investigated the reduction of NOx using hydrocarbons as reducing agents through a rotating arc plasma reformer for selective catalytic reduction. The results showed that the carbon-to-oxygen ratio and catalyst temperature influenced the efficiency of NOx removal.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Igor Karpilov, Dmitry Pashchenko
Summary: This study compares the combustion and emission characteristics of methane mixed with steam and the products of methane reforming with steam. The results indicate that syngas combustion occurs at higher temperature and emits more NOx compared to methane combustion, but adding steam to the fuel inlet can reduce emissions for both methane and syngas.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Environmental Studies
Yoo-Jin Jung, Jin-Sun Cha, Se-Jeong Lim, Jin-Woo Park, Min-Chul Shin, Young-Kwon Park
Summary: This study analyzed the impact of dispersant characteristics on the properties and de-NOx efficiency of SCR catalysts. Measurements of zeta potential, pH, and molecular weight were conducted, and thermal properties were compared through TG-DTA analysis. Py-GC/MS analysis and MSDS contents were used to compare components and molecular weight types of the dispersant. The results showed that dispersants with higher zeta potential, pH, and molecular weight improved the dispersibility of TiO2 slurry. Characteristics such as rheology, sedimentation, and pH change were studied to compare the dispersibility of catalyst slurries, and dispersion characteristics of TiO2 slurries were confirmed by TEM. The de-NOx efficiency of the SCR catalysts varied based on the dispersant used, with higher dispersibility resulting in higher efficiency.
ENERGY & ENVIRONMENT
(2023)
Article
Engineering, Chemical
Avik Denra, Nosir Matyakubov, Shirjana Saud, Sosiawati Teke, Duc Ba Nguyen, Young Sun Mok
Summary: This study investigated the use of gliding arc plasma and Ag/γ-Al2O3 catalyst to improve the removal efficiency of NOx from diesel engine exhaust gas. The experimental results showed that plasma treatment significantly enhanced the removal efficiency of NOx, especially at temperatures ranging from 127°C to 226°C. This enhancement was attributed to the reactivation of the catalyst and the production of hydrogen by the plasma.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Energy & Fuels
M. Zuhaib Akram, Fanhua Ma, Muhammad Aziz, Yangbo Deng, Han Wu
Summary: The use of hydrogen as a zero-carbon fuel alongside hydrocarbon fuels can effectively reduce the environmental impact and dependence on nonrenewable energy resources caused by internal combustion engines. A numerical approach was conducted to investigate the influence of hydrogen on combustion kinetics, soot formation, and NOx emission of hydrocarbon fuel under different flame conditions. The results demonstrated that hydrogen hindered the formation of soot, carbon monoxide, carbon dioxide, and polycyclic aromatic hydrocarbons by reducing small chain hydrocarbons. Furthermore, the presence of hydrogen decreased NO3 emissions by reducing the molar fraction of small chain hydrocarbons and C-H-O related species. C3H3 was found to play a dominant role in reducing CO2 and NO3 emissions, while C2H2 and C5H4CH2 controlled the formation of soot precursors in hydrocarbon fuel flames. Additionally, C2H2 limited the emission of NH3 in diffusion flame conditions.
Article
Thermodynamics
Kai Lu, Shuzhan Bai, Zhicheng Zang, Guoxiang Li
Summary: This paper proposes a deposits control method based on the deposits boundary of the ATS structure. Engine bench test was used to obtain the deposits boundary map for four different rotational speeds, resulting in high, medium, and low deposition risk regions. The middle line of the medium risk region was used as the deposits control strategy value for urea injection. Using the deposits boundary control strategy, urea consumption was reduced by 11.2% and 15.3% under WHTC cycle and WHSC cycle conditions, respectively. The engine can evaluate the urea injection quantity within the deposits risk range based on the deposits boundary to comply with emission regulations and avoid ATS deposits failures.
Article
Chemistry, Multidisciplinary
Kyungseok Lee, Byungchul Choi, Cheolho Kim, Chunbeom Lee, Kwangchul Oh
Summary: The combination of Ag/Al2O3 and CuSn/ZSM-5 showed superior catalytic performance in reducing NOx and oxidizing C3H6 at lower temperatures. Sequential arrangement of 1Ag/Al2O3 + 2Cu1Sn/ZSM-5 was found to be the best catalytic configuration for simultaneous reduction of NOx, C3H6, and H-2 over a wide temperature range. The reduced NOx was mostly converted to N-2 with minimal generation of N2O, NH3, and HCNO.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Chemistry, Physical
Huanhao Chen, Sarayute Chansai, Shaojun Xu, Shanshan Xu, Yibing Mu, Christopher Hardacre, Xiaolei Fan
Summary: The bimetallic Pt-Ni@CeO2 catalyst exhibited significantly enhanced performance in terms of activity, H2/CO ratio, and long-term stability compared to the monometallic Ni@CeO2 catalyst. In situ studies revealed that the Pt phase in the bimetallic catalyst played a crucial role in improving CO2 dissociation, reducing coke formation, and enhancing metal dispersion for CH4 decomposition.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Onochie Okonkwo, Huang Zhang, Kenneth Li, Qianfeng Liu, Pratim Biswas
Summary: A holistic analysis of hydrocarbon reforming using equilibrium calculations was conducted to determine the optimal reforming feed composition for hydrogen and synthesis gas production. The findings suggest that reforming with methane provides the best opportunity for carbon dioxide incorporation.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Environmental
Yuqing Pan, Na Li, Ke Li, Shiyuan Ran, Chenyang Wu, Qulan Zhou, Jiyuan Liu, Shuzhou Li
Summary: This study reports a Fe2O3/amorphous SiO2 catalyst with high low-temperature activity for CO-SCR. Experiments and density functional theory (DFT) calculations provide direct evidence that an optimal content of oxygen vacancy enhances the low-temperature NO conversion ratio and N2 selectivity of Fe2O3-based catalyst. Compared with conventional defect engineering, the alpha-Fe2O3 (1 1 0) facet enables an oxygen vacancy generation-filling cycle in the CO-SCR reaction, following Mars-van Krevelen (MvK) mechanism.
CHEMICAL ENGINEERING JOURNAL
(2023)
Correction
Chemistry, Physical
Jun Cao, Sohrab Rohani, Weizao Liu, Honghui Liu, Zhuquan Lu, Hongli Wu, Lijun Jiang, Ming Kong, Qingcai Liu, Xiaojiang Yao
Summary: The publisher apologizes for the error in the corresponding authors' address and has made the necessary updates.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Lin Guo, Jianjiang Lu, Yonggang Zhao, Chengzhi Wang, Cheng Zhang, Changjin Tang, Lin Dong, Wei Kong, Qijun Li, Peng Cao
Summary: The novel Ce-based low-temperature honeycomb catalyst showed high efficiency in DeNO(x) of flue gas with high water vapor and low sulfur dioxide content, demonstrating stable performance over an extended period. Physicochemical properties of the catalyst were thoroughly investigated through various characterization methods, showing effective prevention of particulate matter deposition in the flue gas.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Shida Xu, Yun Wu, Feilong Song, Xin Chen, Di Jin
Summary: By adjusting the parameters of DBD plasma, the composition and concentration of hydrocarbon blends can be changed to improve the detonation-supporting performance of fuel-rich catalytic combustion products. When the discharge frequency is low, there is a promotion of the conversion of light gaseous substances, while increasing load voltage will strengthen this effect. The regulation effect will be strengthened with the increase of pulse width.
PLASMA SCIENCE & TECHNOLOGY
(2021)
Review
Chemistry, Applied
Dong Wook Kwon, Somin Lee, Jongsik Kim, Kwan-Young Lee, Heon Phil Ha
Summary: The roles of WO3 and SiO2 as supported on TiO2 in Ce-V catalysts were systematically investigated for NH3-SCR and NH3-oxidation at high temperatures. The addition of SiO2 and WO3 to TiO2 resulted in increased surface area, reduced nanoparticle size, and enhanced catalytic defects and oxygen species on Ce-V/TWS surface. Increasing (V4+ + V3+) fraction improved catalytic activity, with WO3 and SiO2 promoting redox properties and making Ce-V/TWS the most suitable catalyst for N-2 production via NH3 direct oxidation at high temperatures.
Article
Physics, Applied
Duy Khoe Dinh, Seongil Choi, Dae Hoon Lee, Sungkwon Jo, Kwan-Tae Kim, Young-Hoon Song
PLASMA PROCESSES AND POLYMERS
(2018)
Article
Chemistry, Physical
Dae Hoon Lee, Jae-Ok Lee, Kwan-Tae Kim, Young-Hoon Song, Eunseok Kim, Hyun-Sik Han
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2012)
Article
Engineering, Chemical
Nakyung Hwang, Jongguen Lee, Dae Hoon Lee, Young-Hoon Song
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2012)
Article
Engineering, Chemical
Seongil Choi, Hongjae Kang, Kwan-Tae Kim, Young-Hoon Song, Dae Hoon Lee
Summary: Efficient plasma reformer design requires effective fuel conversion and chemical energy extraction. This study investigated the ignition process in a diesel reformer, identifying the locations of flame kernels generated by a rotating gliding arc under different power conditions. The results showed that the generation mechanism of flame kernels in the plasma reformer is influenced by flow and arc dynamics.
PLASMA CHEMISTRY AND PLASMA PROCESSING
(2021)
Article
Chemistry, Physical
Hongjae Kang, Seongil Choi, Chan Mi Jung, Kwan-Tae Kim, Young-Hoon Song, Dae Hoon Lee
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Taegyu Kim, Dae Hoon Lee, Sungkwon Jo, Sung Hyun Pyun, Kwan-Tae Kim, Young-Hoon Song
Article
Meteorology & Atmospheric Sciences
Kwan-Tae Kim, Dae Hoon Lee, Jae-Ok Lee, Min Suk Cha, Young-Hoon Song
JOURNAL OF KOREAN SOCIETY FOR ATMOSPHERIC ENVIRONMENT
(2010)
Article
Thermodynamics
DH Lee, DE Park, E Yoon, S Kwon
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2003)
