Article
Chemistry, Physical
Zhonghui Cui, Song Song, Huibin Liu, Yingtian Zhang, Fei Gao, Tong Ding, Ye Tian, Xiaobin Fan, Xingang Li
Summary: By constructing dual-site copper catalysts with Cu+ single atoms and Cu nanoparticles, this study successfully enhances the water-gas shift reaction, increasing CO adsorption and catalytic activity, especially performing better at low temperatures.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Multidisciplinary Sciences
Yuanyuan Li, Matthew Kottwitz, Joshua L. Vincent, Michael J. Enright, Zongyuan Liu, Lihua Zhang, Jiahao Huang, Sanjaya D. Senanayake, Wei-Chang D. Yang, Peter A. Crozier, Ralph G. Nuzzo, Anatoly Frenkel
Summary: This study reveals the dynamic characteristics of a Pt/CeO2 system for the water gas shift reaction, showing the formation and transformation of perimeter Pt-0-O vacancy-Ce3+ sites that regulate adsorbate behaviors and play a key role in the catalytic mechanism. The dynamic nature of these sites is crucial for understanding the reaction mechanism.
NATURE COMMUNICATIONS
(2021)
Article
Energy & Fuels
Eduardo Poggio-Fraccari, Antonella Abele, Nicolas Zitta, Javier Francesconi, Fernando Marino
Summary: The combination of Water Gas Shift (WGS) and CO preferential oxidation (COPROX) reactions is considered effective for CO removal in H-2 feed for PEM fuel cells. Monolithic catalysts coated with Ce or Ce-Pr and Cu or Cu-Ni showed promising results with a 35% mass increase. Adjusting the Pr content in WGS monoliths and using Cu/ceria monolithic samples for COPROX resulted in optimal activity-selectivity ratios. Operating at around 130 degrees C with a contact time of 0.1 g.s/cm^3 and an O-2/CO = 1 M ratio was found to be the most suitable parameters set.
Article
Chemistry, Physical
Mo Li, Thi Ha My Pham, Emad Oveisi, Youngdon Ko, Wen Luo, Andreas Zuttel
Summary: CeO2-supported Cu catalysts are highly active and selective for CO2 hydrogenation to CO, with metallic copper and partially reduced ceria identified as the active sites. The strong interaction between Cu and CeO2-x during CO2 hydrogenation was favored, facilitating the conversion of CO2 to CO. The surface analysis revealed the step-by-step process of CO2 hydrogenation, providing experimental evidence for a high catalytic performance in the RWGS reaction.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jing Ning, Yan Zhou, Wenjie Shen
Summary: The density of surface oxygen vacancies induced by the shape of ceria determines the structure and chemical state of copper species. Copper atoms can be atomically dispersed on ceria particles and rods, but form clusters on cubic ceria. The active sites for the water-gas shift reaction can be tuned by dispersing Cu species on shape-controlled ceria particles.
SCIENCE CHINA-CHEMISTRY
(2021)
Article
Chemistry, Physical
Wathone Oo, Ji Hye Park, Zakia Akter Sonia, May Zaw Win, Dooyong Cho, Kwang Bok Yi
Summary: In this study, the Cu-CeO2 catalyst was synthesized via the Reverse Microemulsion (RME) method to overcome the drawbacks of aggregate formation and nanoparticles' instability in the conventional Impregnation (IMP) method. The RME method resulted in the preparation of porous particles with uniform size distribution and improved interaction within the composites. The 20% Cu-CeO2 catalyst prepared by the RME method exhibited superior Water Gas Shift (WGS) catalytic activity and sustained catalytic activity throughout the entire 48 h period without any signs of deactivation, highlighting the potential of RME method for developing more effective nanoparticle catalysts for hydrogen production.
Article
Chemistry, Multidisciplinary
Georgios Varvoutis, Maria Lykaki, Eleni Papista, Sonia A. C. Carabineiro, Antonios C. Psarras, Georgios E. Marnellos, Michalis Konsolakis
Summary: The effect of cesium doping on CuO/CeO2 catalysts under CO2 hydrogenation conditions was investigated. Results showed that a low amount of cesium improved CO selectivity but inhibited CO2 conversion. Specifically, doping with 2 cesium atoms per nm(2) at 430 degrees Celsius led to over 96% CO selectivity and equilibrium CO2 conversion.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Engineering, Chemical
Gianluca Landi, Giulia Sorbino, Fortunato Migliardini, Giovanna Ruoppolo, Almerinda Di Benedetto
Summary: In this study, we propose a novel bimetallic iron-copper catalyst supported on ceria for the high-temperature water gas shift reaction. The catalyst exhibits excellent catalytic performance with low active phase content, good thermal stability, and no chromium content. The outstanding performance is attributed to the strong iron-copper and metal-support interactions.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Yiqiang Jiang, Yunjin Sung, Changhyeok Choi, Gi Joo Bang, Song Hong, Xinyi Tan, Tai-Sing Wu, Yun-Liang Soo, Pei Xiong, Molly Meng-Jung Li, Leiduan Hao, Yousung Jung, Zhenyu Sun
Summary: In this study, a highly efficient non-noble metal catalyst for CO2 hydrogenation was reported. The catalyst utilized single Mo atoms with a MoN3 structure as the active sites, enabling remarkable CO2 adsorption and hydrogenation to CO. The catalyst exhibited high stability and a good CO2 conversion rate under the conditions of 500°C and a low H2 partial pressure, with a CO selectivity close to 100%. This finding provides a promising route for the reverse water-gas shift reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Nanoscience & Nanotechnology
Xiao-Meng Lai, Qi Xiao, Chao Ma, Wei-Wei Wang, Chun-Jiang Jia
Summary: The 0.5Pt/3Ce-10Ti catalyst showed significant advantages in the water gas shift reaction. The heterostructured CeO2-TiO2 support effectively regulated the Pt status and influenced the adsorption ability of CO, resulting in improved reaction activity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Seongmin Jin, Yongha Park, Gina Bang, Nguyen Dat Vo, Chang-Ha Lee
Summary: This study presents the use of a MgCeOx-supported Cu catalyst with a unique bead structure to enhance the water-gas shift reaction. The introduction of MgO led to unprecedented improvements in activity, promoting water dissociation and participating in redox mechanisms. The use of MgCuCe resulted in a lower hydrogen production cost compared to commercial and CeO2-supported catalysts, paving the way for the development of efficient catalysts utilizing earth-abundant MgO and contributing to cost reduction in H-2 production.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Hui Zhou, Dong Wang, Xue-Qing Gong
Summary: By performing density functional theory calculations, it was found that the composite catalysts of inverse CeOx/Cu(111) can produce more active hydride species compared to CeO2 or Cu alone. This is mainly due to the efficient combination of the unique structural feature of CeOx islands and the electronic promotion from Cu. Additionally, modifying the Cu(111) surface with pyridine molecules can enhance the thermo- and dynamical stabilities of the hydride species.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Long Kuai, Li Liu, Qingmei Tao, Nan Yu, Erjie Kan, Na Sun, Shoujie Liu, Baoyou Geng
Summary: This study develops an efficient micro-gas blasting strategy to prepare versatile noble metal single-atoms/metal oxide nanosheets catalysts. The Pt/CeO2 nanosheets catalyst exhibit superior reactivity and stability in the water-gas shift reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Physical
Seongmin Jin, Hyukjun Byun, Chang-Ha Lee
Summary: Tuning the properties of metal oxides is crucial for enhancing the activity of metal oxide-supported catalysts. By introducing abundant defects into MgO, its limited reducibility can be overcome, leading to increased catalytic activity. Increasing the MgO content and temperature significantly promotes the reconstruction of active surface oxygen, demonstrating the feasibility of using nonreducible MgO as an active support for reactions where redox properties are important.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
M. I. Ariens, L. G. A. van de Water, A. I. Dugulan, E. Bruck, E. J. M. Hensen
Summary: This study investigates the copper promotion of chromium-doped iron oxide prepared via co-precipitation for high-temperature water-gas shift (WGS) catalysis. The results show that copper doping delays the formation of hematite in the fresh catalyst, facilitating the formation of small crystallites of ferrihydrite. Chromium is incorporated in the octahedral sites of the active magnetite phase, resulting in a partially oxidized structure. Copper promotion enhances the CO conversion under high-temperature WGS conditions.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Organic
Mao-Lin Yang, Hao-Ran Chen, Long Zhao, Ming-Wu Ding
Summary: A new efficient synthesis method for the preparation of 6,12-dihydro-5H-quinazolino[3,2-a]quinazolin-5-ones has been developed. This method involves sequential Ugi/Staudinger/aza-Wittig/addition/nucleophilic acyl substitution reactions and provides a domino and effective strategy for the preparation of various substituted quinazolino[3,2-a]quinazolin-5-ones under mild reaction conditions.
SYNTHESIS-STUTTGART
(2023)
Article
Automation & Control Systems
Huiming Li, Hao Chen, Xiangke Wang
Summary: This paper investigates the problem of collision-free leader-follower formation generation and tracking of multiple fixed-wing unmanned aerial vehicles (UAVs). A novel control law based on physicomimetics approach is proposed to integrate formation generation, formation tracking, and collision avoidance. The artificial forces driven by control laws imitating physical forces are used to achieve desired collaborative behaviors and obstacle avoidance naturally. Speed constraints are also considered and modified using a saturation function. Numerical simulations and experiments are provided to verify the effectiveness of the proposed control scheme.
ASIAN JOURNAL OF CONTROL
(2023)
Article
Engineering, Environmental
Long Liang, Chunmin Zhang, Shaolei Zhao, Baozhong Liu, Limin Wang, Fei Liang
Summary: Designing efficient catalysts is a crucial challenge for practical applications of high-capacity hydride in fuel-cell-based hydrogen economy. In this study, platinum-functionalized Ti3C2 material with an accordion-like structure, interlayer, and surface-dispersed nanoparticles was synthesized. The catalyst, Ti3C2@Pt, reduced the initial dehydrogenation temperature of high-density hydride AlH3 by 50% to 62 °C, comparable to commercial AlH3. Moreover, it exhibited high hydrogen supplying performance and retention ratio, achieving 9.3 wt% and 98% respectively, surpassing previously reported catalysts. The exceptional dehydrogenation performance of the material makes it a practical candidate for mobile device applications with the aid of high-efficiency catalysts.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Qiang Liu, Youjin Gong, Boyu Liu, Shunshun Xiong, Hui-Min Wen, Xiaolin Wang
Summary: In this study, an ultra-microporous alkyl Cu-based MOF-11 was developed for highly selective adsorption of xenon. The unique pore system of MOF-11 not only enables strong binding affinity with xenon, but also allows for dense packing of xenon molecules. MOF-11 demonstrates record-high xenon storage density, uptake, and selectivity, making it a promising candidate for xenon separation and capture.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Rheumatology
Haoran Chen, Huarui Liu, Wenting Lyu, Yin Liu, Mei Huang, Yingwei Zhang, Yuying Qiu, Yonglong Xiao, Hourong Cai, Jinghong Dai
Summary: This study retrospectively analyzed the clinical characteristics and risk factors of clinical recurrence in interstitial lung disease related to antisynthetase syndrome (ARS-ILD). Recurrence of ARS-ILD was common during medication intensity reduction, and age, lactate dehydrogenase (LDH), medication tapering duration, and discontinuation were identified as risk factors for recurrence.
CLINICAL RHEUMATOLOGY
(2023)
Article
Automation & Control Systems
Yuanmao Ye, Yongbin Zhang, Xiaolin Wang, Ka-Wai Eric Cheng
Summary: This article presents a new type of step-up multilevel inverter (MLI) using a front-side quasi-Z-source unit, which effectively limits the charging current variation and enhances the total voltage gain.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Jacob Smith, Zhennan Huang, Wenpei Gao, Guannan Zhang, Miaofang Chi
Summary: Cryogenic four-dimensional scanning transmission electron microscopy (4D-STEM) imaging is a valuable technique for studying quantum materials and their interfaces at atomic scale, but its applications are restricted by the instability of cryo-stages and electronics. To address this issue, an algorithm is developed to correct complex distortions in the atomic resolution cryogenic 4D-STEM data sets. This method involves nonrigid registration and affine transformations to minimize information loss in both reciprocal and real spaces, enabling the reconstruction of sample information from 4D-STEM data sets. It is computationally inexpensive, fast, and suitable for on-the-fly data analysis in future in situ cryogenic 4D-STEM experiments.
Article
Chemistry, Physical
Xinbin Yu, Jisue Moon, Yongqiang Cheng, Luke Daemen, Jue Liu, Sung Wng Kim, Abinash Kumar, Miaofang Chi, Victor Fung, Anibal J. Ramirez-Cuesta, Zili Wu
Summary: NH3 synthesis is a critical industrial process. Ru catalysts have high activity in this reaction but are susceptible to hydrogen poisoning. By using supports like electrides and hydrides, the problem of hydrogen poisoning can be alleviated. However, there is limited research on the structural dynamics of Ru/electride catalysts during the reaction.
CHEMISTRY OF MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Zongyu Wang, Bishnu P. Thapaliya, Ilja Popovs, Yangyang Wang, Tao Wang, Jihua Chen, Mark A. Arnould, Shannon M. Mahurin, Sheng Dai
Summary: The construction of solid electrolytes coated with multiple layers of polyanions and polycations using layer-by-layer assembly method demonstrates good ionic conductivity and mechanical robustness, making them valuable for electrochemical devices and high-voltage battery applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Bishnu P. P. Thapaliya, Tao Wang, Albina Y. Y. Borisevich, Harry M. M. Meyer III, Xiao-Guang Sun, Mariappan Parans Paranthaman, Craig A. A. Bridges, Sheng Dai
Summary: High-capacity cathodes (LiNi0.8Mn0.1Co0.1O2, NMC811) have the potential for vehicle electrification due to their high gravimetric energy density, but their electrochemical performance depends on the stability of the cathode electrolyte interphase (CEI). A conformal LiF layer formed on the NMC811 electrode surface through an in situ ion-exchange metathesis process improves the electrochemical performance by stabilizing the CEI. This finding could pave the way for enhancing the electrochemical performances and cycling stability of high-capacity cathodes by reengineering the CEI.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Qiang Deng, Honggen Peng, Zhenzhen Yang, Tao Wang, Jun Wang, Zheling Zeng, Sheng Dai
Summary: Developing a powerful bifunctional catalyst is crucial for achieving future carbon neutrality by reducing energy consumption in the chemical industry. This study synthesizes mesoporous zeolite-encapsulated palladium nanoparticles (Pd@meso-ZSM-5) using emulsification-demulsification and dry-gel transformation methods, which exhibit remarkable catalytic performance in the one-pot multiple tandem reaction of cyclic ketones to bicyclic alkanes. Unlike traditional two-step synthesis routes, Pd@meso-ZSM-5 efficiently produces bicyclic alkanes instead of monocyclic alkanes, due to the sufficient space for large molecular intermediates provided by mesoporosity and the promoting effect of the acid-Pd interface on intermediate conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Allison M. Fleshman, Allison M. Goldman, Wesley J. Hetcher, Stefan L. Debbert, Chi-Linh Do-Thanh, Shannon M. Mahurin, Sheng Dai
Summary: The methylation of imidazolium-based room temperature ionic liquids (RTILs) paired with [Tf2N](-) anion results in an unexpected increase in viscosity, while the viscosity decreases when the methylated imidazolium is paired with [B(CN)(4)](-) anion. The compensated Arrhenius formalism (CAF) is used to study the viscosity observations, focusing on the activation energy and entropy of activation. The results show that the activation energy increases with methylation for [Tf2N](-), but decreases for [B(CN)(4)](-).
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Nanoscience & Nanotechnology
Ounjit Sodpiban, Tanika Kessaratikoon, Jacob Smith, Guodong Ren, Silvano Del Gobbo, Sonali Das, Miaofang Chi, Valerio D'Elia, Bruce C. Gates
Summary: This study prepares atomically dispersed cerium catalysts to enhance their activity in CO oxidation reaction. By using Ce-(III) and Ce-(IV) precursors, the cerium catalysts on MgO support were successfully prepared and characterized before and after catalysis using various techniques. The results show that the excellent catalyst maintains stable activity during the 2-day reaction time and exhibits improved reducibility with the transformation of cerium ions.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Liqi Qiu, Yuqing Fu, Zhenzhen Yang, Anna C. Johnson, Chi-Linh Do-Thanh, Bishnu P. Thapaliya, Shannon M. Mahurin, Liang-Nian He, De-en Jiang, Sheng Dai
Summary: In this study, pyrazolonate-derived SILs with anti-oxidation properties were developed by introducing aza-fused rings in the oxygenate-derived anions. These SILs showed promising and tunable CO2 uptake capacity surpassing the phenolate-based SIL through a carbonate formation pathway, as confirmed by spectroscopy studies.
Article
Electrochemistry
Runming Tao, Tianyu Zhang, Xiao-Guang Sun, Chi-Linh Do-Thanh, Sheng Dai
Summary: This study presents an ionothermal synthesis-assisted doping strategy to prepare a nanoporous W6+-doped TiNb2O7 material (NPTWNO) with improved electronic conductivity and lithium ion diffusion coefficient. The doped W6+ successfully narrows the conduction-valance bandgap and improves the electrochemical performance of NPTWNO, leading to fast-rechargeable lithium-ion batteries.
BATTERIES & SUPERCAPS
(2023)
