Review
Chemistry, Physical
Wangxiang Pan, Jingping He, Guanlin Huang, Wentao Zhang, De Fang
Summary: This paper reviews the preparation methods, properties, and influencing factors of ZSM-5 catalysts in NH3-SCR, discusses the SCR performance of ZSM-5 catalysts doped with different metal ions, and summarizes the environmental adaptability of ZSM-5 catalysts and their development in denitrification.
Article
Engineering, Environmental
Chunmiao Jia, Jiajian Gao, Kuniadi Wandy Huang, Vishal Jose, Prapisala Thepsithar, Jong-Min Lee
Summary: CuO/γ-Al2O3 catalyst showed excellent catalytic activity in methanol-SCR process, efficiently removing NOx without deactivation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Xiaoyu Li, Juan Chen, Yi Xiao, Chunmei Lu, Hong Yao
Summary: The study found that oxygen enhanced the deactivation of V2O5-WO3-TiO2 caused by arsenic, but had a contrasting impact on the arsenic poisoning process of γ-Fe2O3. Additionally, temperature suppressed the deactivation effect of arsenic on both V2O5-WO3-TiO2 and γ-Fe2O3.
Article
Chemistry, Multidisciplinary
Min Seong Lee, Sun- Kim, Bora Jeong, Jin-Woo Park, Taehyo Kim, Jung Woo Lee, Gibum Kwon, Duck Hyun Lee
Summary: Research on coating an NH4+ layer on a vanadium-based catalyst can significantly improve its NOX removal efficiency over a wide temperature range, as well as enhance its proton conductivity, reducing the amount of vanadium oxides and tungsten oxide.
Article
Energy & Fuels
Lin-gang Wei, Rui-tang Guo, Jue Zhou, Bo Qin, Xin Chen, Zhe-xu Bi, Wei-guo Pan
Summary: This paper discusses the application of Mn-based catalysts in low-temperature NH3-SCR reactions, methods to improve anti-poisoning properties, and different regeneration approaches. The results obtained are crucial for optimizing Mn-based SCR catalysts.
Article
Chemistry, Applied
Shilin Zhao, Junlin Peng, Runqi Ge, Siyu Wu, Kehui Zeng, Huajun Huang, Kaibo Yang, Zhiqiang Sun
Summary: This study comprehensively discusses SCR catalysts with different supports, including their preparation method, composition, deNOx ability, etc. The findings show that metal-based SCR catalysts have good performance in both high and low-temperature deNOx, carbon material as a carrier can enhance deNOx ability, and minerals-based SCR catalysts have good deNOx capacity at medium to low temperature. The good distribution of active elements, chemical adsorption, acid sites, and surface pore structure are crucial for the deNOx ability of catalysts.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Running Kang, Junyao He, Feng Bin, Baojuan Dou, Qinglan Hao, Xiaolin Wei, Kwun Nam Hui, Kwan San Hui
Summary: A series of V2O5/HWO catalysts were prepared by hydrothermal and impregnation methods, with the V2O5/HWO-C catalyst showing optimal NH3-SCR performance due to its rod-shaped morphology and high dispersion. The K-loaded K-V2O5/HWO-C catalyst exhibited effective resistance to K poisoning and SO2, maintaining high NOx conversion efficiency at high temperatures.
Article
Chemistry, Inorganic & Nuclear
Tiancheng Li, Laishi Li, Junkai Wang, Yusheng Wu, Yuzheng Wang, Mingchun Li
Summary: Selective catalytic reduction of nitrogen oxides using carbon monoxide is a promising technology with a series of advantages. In this study, three alpha-Fe2O3 catalysts for CO-SCR were prepared by different methods and characterized. The results showed that the catalytic efficiency of all three catalysts increased with increasing temperature and reached 100% conversion rate at temperatures above 250 degrees C. Among them, the Fe2O3-HT catalyst prepared by the hydrothermal method exhibited the best catalytic efficiency for NO, followed by the precipitation method, while the sol-gel method showed the worst catalytic efficiency. The superior performance of Fe2O3-HT can be attributed to its higher crystallinity and surface Fe3+ content.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Review
Energy & Fuels
Pengju Wu, Xianggang Tang, Zhaohui He, Yangxian Liu, Zhihua Wang
Summary: Studying the alkali metal poisoning mechanism and antipoisoning measures of the SCR catalyst is crucial for increasing the service life of a catalyst and reducing the operation cost of a SCR denitration system.
Article
Chemistry, Physical
Mengru Li, Sung Sakong, Axel Gross
Summary: This computational study examined the atomistic structure of mixed tungsta-vanadia monolayers on a TiO2 support, revealing the critical role of the stoichiometry of the tungsta-vanadia layers in their catalytic activity. Stable catalyst structures under operating conditions were determined, with identified active sites promising high catalytic activity for selective catalytic reduction by ammonia.
Article
Energy & Fuels
Xiaofeng Wang, Yang Xu, Zhe Zhao, Jianbin Liao, Chen Chen, Qingbo Li
Summary: This review summarizes the development of zeolite catalysts in the SCR reaction, including Cu, Fe, Mn and other metal-exchanged zeolites. The study discusses the active sites of different metal-exchanged zeolites in NH3-SCR reaction, emphasizes the role of second metals and metal oxides, and effects of preparation methods and topologies. Challenges and further perspectives of metal-exchanged zeolites in NH3-SCR reaction are proposed to enhance the efficiency of NOx removal.
Article
Chemistry, Physical
Yiqing Wu, Yilin Wang, Eric D. Walter, Kenneth G. Rappe, Yong Wang, Feng Gao
Summary: The impacts of Pd poisoning on the Cu/SSZ-13 selective catalytic reduction (SCR) catalysts are examined. Pd lowers the DeNOx efficiency of Cu/SSZ-13 through the displacement of SCR active sites by isolated Pd-ions and the catalysis of non-selective NH3 oxidation by PdO. The presence of external CuO clusters in the Cu/SSZ-13 catalyst affects the second mechanism differently, mitigating the poisoning effect caused by PdO. This study suggests a strategy to eliminate Pd poisoning by introducing an oxide phase that traps PdO without affecting SCR.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Houcine Touati, Alexandre Guerin, Yousef Swesi, Catherine Batiot Dupeyrat, Regis Philippe, Valerie Meille, Jean-Marc Clacens
Summary: The catalytic decomposition of ozone using Pd/Al2O3 catalysts at 40 degrees C showed that the presence of NOx can significantly poison the catalyst, leading to a decrease in ozone conversion rate over time. However, it was found that the poisoning effect is reversible when using NOx-free ozone feed, allowing for total recovery of the initial catalyst properties.
CATALYSIS COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Yang Xu, Xiaofeng Wang, Mengyue Qin, Qingbo Li
Summary: This review discusses the reaction mechanism and SO2/H2O poisoning in CH4-SCR, highlighting the importance of active sites, oxygen, and intermediate species. It also provides a comprehensive overview of representative metal-exchanged zeolite catalysts and proposes strategies for improving SO2/H2O tolerance and low-temperature catalytic activity through the introduction of a second metal and reducing agent. Suggestions for future studies are also presented.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Liwei Sun, Peng Liu, Jianheng Xu, Kaijie Liu, Zeshu Zhang, Yibo Zhang, Xiangguang Yang
Summary: In this study, a series of bulk vanadium oxide catalysts were synthesized at different temperatures, and it was found that the catalyst with a large amount of crystalline V2O5 synthesized at low temperatures showed excellent NH3-selective catalytic reduction (NH3-SCR) activity at low temperatures. The role of V4+ species in this catalyst was found to be important for low-temperature NH3-SCR, significantly improving the catalytic performance. The difference in NH3 and O2 activation with different ratios of V4+/V5+ in V2O5 was investigated.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Review
Nanoscience & Nanotechnology
Kayla Alicia Davis, Sunghoon Yoo, Eric W. Shuler, Benjamin D. Sherman, Seunghyun Lee, Gyu Leem
Summary: Biomass photocatalytic conversion to hydrogen is a sustainable energy production method with great potential for application. By studying the described photocatalytic strategy and mechanism, biomass can be efficiently converted to hydrogen, with advancements in hydrogen production efficiency.
Article
Nanoscience & Nanotechnology
Tae Hyeong Kim, Hyeji Kim, Hyo Jun Jang, Nara Lee, Kwang Hyun Nam, Dae-won Chung, Seunghyun Lee
Summary: In this study, silver-coated copper powder was modified with alkanethiols of different alkyl chain lengths to enhance its thermal stability and prepare electrically conductive films. It was found that films containing alkanethiol-modified Ag/Cu powders showed superior thermal stability compared to films with untreated Ag/Cu powder. Additionally, the longer the alkyl chain in the alkanethiol-modified Ag/Cu powder, the higher the initial resistance and the lower the increase in resistance under heat treatment.
Article
Chemistry, Multidisciplinary
Jiwon Kim, Sumin Hwang, Quy Son Luu, Donghyuk Jo, Uyen Thi Do, Quynh Thi Nguyen, Jae-Sung Kwon, Seunghyun Lee, Youngbok Lee
Summary: In this study, porous silicon-coated gold nanoparticles (AuNP@pSi) were fabricated as a hybrid nanocomposite capable of surface-enhanced Raman scattering (SERS)-sensing and drug carrier. The overall results suggest that AuNP@pSi can be exploited as a SERS probe with efficient Raman signal improvement of benzenethiol as well as a drug carrier based on its high surface area and porosity. Since the porous silicon possibly can serve as magnetic resonance imaging probes with DNP technology, this hybrid platform potentially can be utilized as powerful material capable of theragnosis system.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2021)
Article
Nanoscience & Nanotechnology
Sunghoon Yoo, Dong Hwan Nam, Thangjam Ibomcha Singh, Gyu Leem, Seunghyun Lee
Summary: The seed-mediated method is a general procedure for the synthesis of gold nanorods. In this study, the effect of two reducing agents, ascorbic acid and hydroquinone, on the growth process was investigated. It was found that by controlling the volume ratios of the reducing agents, gold nanorods with higher aspect ratios could be synthesized.
Article
Nanoscience & Nanotechnology
Seung Mo Lee, Dong Hwan Nam, Dongkyu Lee, Soon Hyuk Lim, Sang Jun Son, Seunghyun Lee
Summary: The study successfully fabricated a highly ordered gold nanoparticle monomer array based on a gold-coated conical anodic aluminum oxide template, creating a ring-shaped hot line between the gold layer and AuNPs for enhanced surface-enhanced Raman scattering signal.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Soo Hyun Kim, Chaewon Lee, Gwi Ju Jang, Sunghoon Yoo, Seunghyun Lee, Sang Yun Han
Summary: By studying the biomolecular compositions of the hard lipid coronas formed around nanoparticles in the blood, we found that HDL components coat the nanosurfaces while neutral lipids participate in the corona formation due to their hydrophobic properties. Notably, cholesterol is significantly enriched in the coronas and its accumulation may play a critical role in the pathogenesis of multiple diseases.
ACS APPLIED NANO MATERIALS
(2022)
Article
Polymer Science
Tae Hyeong Kim, Dong Hwan Nam, Do-Hyun Kim, Gyu Leem, Seunghyun Lee
Summary: This study aims to increase the specific surface area of multi-walled carbon nanotubes (MWCNTs) by forming and removing metal oxide nanoparticles on their surfaces. Facile methods were used for particle formation and removal, and the resulting structures and crystallinity of the metal oxide particles were characterized. Surface area analysis and Raman spectroscopy were used to determine defect formation and the impact of different metals. The results showed an increase in surface area after removing the metal oxide particles, and the metal that induced the highest surface area was identified.
Article
Chemistry, Multidisciplinary
Thangjam Ibomcha Singh, Ashakiran Maibam, Dun Chan Cha, Sunghoon Yoo, Ravichandar Babarao, Sang Uck Lee, Seunghyun Lee
Summary: Introducing amorphous and ultrathin nanosheets of transition bimetal phosphate arrays as shells over an electronically modulated crystalline core can enhance the kinetics of the oxygen evolution reaction and hydrogen evolution reaction. The optimized electrocatalyst exhibits low overpotentials for both reactions and demonstrates remarkable overall water-splitting activity when used as both anode and cathode.
Article
Chemistry, Multidisciplinary
Dun Chan Cha, Thangjam Ibomcha Singh, Ashakiran Maibam, Tae Hyeong Kim, Dong Hwan Nam, Ravichandar Babarao, Seunghyun Lee
Summary: Heteroatom-doped transition metal-oxides combined with metals of low hydrogen adsorption energy barrier can enhance the bifunctional activities and mitigate the low conductivity and high agglomeration of metal nanoparticles in a conductive carbon matrix. A 3D mesoporous heterostructure of boron-doped cobalt-oxide/cobalt-metal nanohybrids embedded in a nitrogen-doped carbon matrix is developed as a binder-free electrocatalyst for alkaline water-splitting. The electrocatalyst shows low overpotentials for both the oxygen evolution reaction and the hydrogen evolution reaction, along with excellent long-term durability.
Article
Chemistry, Multidisciplinary
Sunghoon Yoo, Goeun Youn, Hyunseung Lee, Jae-Sung Kwon, Youngbok Lee, Seunghyun Lee
Summary: Recently, the use of anisotropic plasmonic nanoparticles in nanomedicine has become increasingly popular. In this study, we successfully synthesized uniform ultra-small gold nanorods with high yield using hydroquinone as the reducing agent. By adjusting the volume of hydroquinone, we were able to control the growth rate of the gold nanorods. Additionally, by adjusting the volume of the gold precursor, we synthesized ultra-small gold nanorods with specific dimensions.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Analytical
Yixuan Wu, Qian Yu, Younju Joung, Chang Su Jeon, Seunghyun Lee, Sung Hyun Pyun, Sang-Woo Joo, Lingxin Chen, Jaebum Choo
Summary: This study reports the development of a reproducible and highly sensitive surface-enhanced Raman scattering (SERS) substrate using a butanol-induced self-assembly of gold nanoparticles (AuNPs) and its application as a rapid diagnostic platform for SARS-CoV-2. The substrate showed strong electromagnetic enhancement of the Raman signals, enabling the detection of SARS-CoV-2 with a very low limit of detection (LoD) of 3.1 x 10(-15) M. This method provides sufficient sensitivity for SARS-CoV-2 screening assay and reduces the diagnostic time significantly. The results suggest the potential of this approach for developing rapid diagnostic platforms for other biomolecules and infectious diseases.
ANALYTICAL CHEMISTRY
(2023)
Review
Chemistry, Multidisciplinary
Manjinder Singh, Dun Chan Cha, Thangjam Ibomcha Singh, Ashakiran Maibam, Dasu Ram Paudel, Dong Hwan Nam, Tae Hyeong Kim, Sunghoon Yoo, Seunghyun Lee
Summary: Introducing complementary active materials in tandem as heterostructures can greatly improve the physicochemical properties. The use of amorphous materials with crystalline moieties as electrocatalysts has seen rapid growth. The combination of amorphous-crystalline-based materials allows for excellent bifunctional activity in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). While crystalline materials have better properties, their limited activity due to surface confinement can be overcome by integrating amorphous materials. This review aims to provide comprehensive details on the fabrication, composition, and physicochemical properties of amorphous-crystalline heterostructures for water-splitting applications.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Polymer Science
Tae Hyeong Kim, Dun Chan Cha, Jung-Chae Jeong, Seunghyun Lee
Summary: In this study, multi-walled carbon nanotubes (MWCNTs)-CuO composites were fabricated using a microwave method, with the size and number of CuO domains controllable by the number of copper hydrate precursors. Characterization of the composites was done using various techniques, confirming the monoclinic crystal structure of the CuO produced in the composites.
ELASTOMERS AND COMPOSITES
(2021)
Article
Materials Science, Multidisciplinary
Kyu Hwan Choi, Dong Woo Kang, Sunghoon Yoo, Seunghyun Lee, Bum Jun Park
ACS APPLIED POLYMER MATERIALS
(2020)
