Article
Chemistry, Applied
Enkang Fu, Yu Qiu, Huaichang Lu, Sijun Wang, Lishan Liu, Hanjun Feng, Yanxin Yang, Zizhan Wu, Yunlong Xie, Feng Gong, Rui Xiao
Summary: In this study, bimetallic M(M = Co, Fe, Cu)Ni/Al2O3 catalysts were synthesized, showing superior catalytic performance over a wide temperature range, with Co playing a key role in reducing the energy barrier for the associative decomposition of N to form N2.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yong Hu, Qian Xu, Xiujing Zou, Xueguang Wang, Hongwei Cheng, Xingli Zou, Xionggang Lu
Summary: Metal oxide-modified Ni/CaO dual functional materials (M-Ni/Ca DFMs) demonstrate excellent performance in CO2 capture and hydrogenation, especially La-Ni/Ca with the highest CO2 adsorption capacity, conversion, and CO yield. The addition of metal oxides increases the number of basic sites, playing a crucial role in efficient CO2 capture. The outstanding cyclic stability of La-Ni/Ca is attributed to the presence of La2O3, which inhibits the growth and sintering of CaO and Ni particles.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Narasimharao Katabathini, Islam Hamdy Abd El Maksod, Mohamed Mokhtar
Summary: In this study, Cu-SiO2-pil-ile and Cu-SiO2-pil-mag catalysts showed high efficiency in decomposing NO at high temperatures, achieving high NO conversion rates and N-2 selectivity. Various analytical methods revealed that the different metal oxides led to catalysts with distinct pore structures and acidic sites. The synergism between redox centers was identified as the major reason for the superior performance of the catalysts in NO decomposition.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Physical
Xia Liu, Hao Liu, Danyang Li, Gangjie Ning, Xinxin Li, Lihui Dong, Bin Li
Summary: The 3DOM Ce0.8Cu0.1Zr0.1O2 catalyst shows good NO conversion performance at low temperatures, with resistance to H2O and SO2 poisoning, and the formation of more oxygen defects and Ce3+ which enhances catalytic activity. Additionally, doping with copper ions improves surface activity of the catalyst.
Article
Multidisciplinary Sciences
Begum Unveroglu
Summary: Electrochemical deposition of Ni metal matrix composite coatings is commonly used to enhance the corrosion resistance and hardness of materials. In this study, Ni-Cu and Ni-Cu/CeO2 metal matrix coatings were fabricated on SS 304 substrates via electrodeposition. The addition of CeO2 particles into the electrolyte resulted in a more negative shift of the hydrogen evolution reaction and a slightly accelerated deposition of Ni ions. Compositional analyses revealed a higher Ni fraction in the deposit with CeO2-containing electrolyte. XRD measurements confirmed the presence of Ni-Cu solid solutions in all coatings and the presence of CeO2 in the ceramic reinforced layer. The morphology of the coatings changed from cauliflower-like to a denser layer with the addition of CeO2. The hardness of the samples increased and the corrosion current density decreased with the addition of CeO2, indicating an improved performance for the Ni-Cu/CeO2 metal matrix composite coating. The findings were also supported by Nyquist and Bode plots in the potentiodynamic polarization tests.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Physical
Pingping Xie, Xin Yong, Yongdan Li, Shetian Liu, Cuijuan Zhang
Summary: The study found that the 5%BaCoO3-CeO2 catalyst prepared by the one-pot method exhibits superior activity and oxygen resistance due to smaller grains, uniform distribution of components, larger surface area, better redox activity, faster oxygen desorption kinetics, and better NO sorption capability. The findings highlight the potential of the one-pot method for synthesizing high-performance heterogeneous catalysts.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Hai-Chao Sun, Kun Yuan, Wang-De Hua, Zi-Rui Gao, Qian Zhang, Chen-Yue Yuan, Hai-Chao Liu, Ya-Wen Zhang
Summary: The metal-support interface plays a crucial role in heterogeneous catalysis by influencing catalytic efficiency. This study presents a strategy to optimize the interfacial activity of Co/ CeO2 catalysts for the water-gas shift reaction (WGSR) through a simple NH3 treatment process. The NH3 treatment weakens the metal-support interaction and induces oxygen vacancy generation, resulting in improved CO adsorption and activation ability. This combination of effects enhances the catalytic efficiency for the WGSR via the carboxyl pathway at low temperatures.
Article
Chemistry, Physical
Wenxue Ji, Pingping Xie, Yongdan Li, Cuijuan Zhang
Summary: Composite catalysts BaMnO3-CeO2 with high catalytic activity, oxygen resistance and durability were designed and prepared. The conversion rate of NO to N2 can reach 85.9% at 800 degrees C over 5% BaMnO3-CeO2. It exhibits an activity of 66.5% in the presence of 10 vol% O2 and runs stably for more than 200 h in 5 vol% O2 at 800 degrees C.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Xiao-Chen Sun, Kun Yuan, Wang-De Hua, Zi-Rui Gao, Qian Zhang, Chen-Yue Yuan, Hai-Chao Liu, Ya-Wen Zhang
Summary: The metal-support interface is crucial in heterogeneous catalysis, and modulation of the metal-support interaction can enhance catalytic efficiency. In this study, a NH3 treatment process was used to modulate the interface interaction of Co/CeO2 catalysts for the water-gas shift reaction (WGSR). The treatment resulted in improved catalytic activity by weakening the metal-support interaction, enhancing CO adsorption and activation, and inducing oxygen vacancy generation. The active interface construction could be extended to other catalysts and has great potential in various chemical transformation reactions and industrial catalysis.
Article
Energy & Fuels
Mudi Ma, Rui Yang, Zeyu Jiang, Changwei Chen, Qiyuan Liu, Reem Albilali, Chi He
Summary: This study focused on the reduction and control of anthropogenic VOCs, with a particular emphasis on the fabrication of noble-metal-free monolithic catalysts for industrial VOC removal. A Mn-based cordierite monolithic catalyst showed exceptional activity and stability in the catalytic oxidation of ethyl acetate, with the presence of low levels of water vapor promoting EA conversion while higher concentrations inhibited it. This work provides important insights for designing VOC oxidation catalysts under practical conditions.
Article
Chemistry, Multidisciplinary
Jhongren Huang, Hengweng Wei, Tengruei Wei, Yihsuan Lee
Summary: This study investigates the potential of spinel-structured materials as cathodes of SOECs and demonstrates the improvement in performance by employing LSGM blocking layers. With the insertion of LSGM layers, the Faradaic efficiency for CO2 reduction and the gas generation efficiency of SOECs were significantly improved. NiFe2O4 and CuFe2O4 showed superior electrolytic performance and stability in the optimized SOEC structure.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Engineering, Chemical
Lin Chen, Shan Ren, Yuhan Zhou, Xiaodi Li, Mingming Wang, Zhichao Chen, Jie Yang
Summary: Transition metal oxides impregnated on nanopolyhedron CeO2 catalysts showed that Mn-CeO2-NP catalyst exhibited the highest NOx conversion in SCR reaction, with higher oxygen vacancy concentration and more acid sites.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Physical
Ting Li, Yuhao Tian, Xiaoli Yan, Weijie Cai
Summary: Designing high-performance catalysts is of great significance for the conversion of CO2 and bio-ethanol into high value-added syngas. In this study, a Ni-based catalyst with a core@shell structure was found to exhibit higher activity and better stability compared to a Cu-based catalyst. This work provides valuable information for addressing coke formation and metal sintering issues in reforming processes.
Article
Chemistry, Physical
Ashish D. Shejale, Ganapati D. Yadav
Summary: Hydrogen production via renewable sources using ethylene glycol as a feedstock is of great interest. Mixed metal oxides supported Ni-Cu catalysts showed promising results for high purity H-2 production, with Ni-Cu/CeO2-MgO exhibiting the highest H-2 concentration and stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Weicong Wang, Tianou He, Xiaolong Yang, Yaming Liu, Chaoqi Wang, Jiao Li, Andong Xiao, Ke Zhang, Xiatong Shi, Mingshang Jin
Summary: The study presents a novel strategy for preparing noble metal-based nanomaterials with amorphous structures at low temperatures. The amorphous PdCu nanowires prepared using this method exhibit high activity as electrocatalysts for formic acid oxidation, surpassing crystalline-dominant counterparts. The outstanding catalytic performance of the amorphous PdCu nanowires is attributed to the high surface reactivity induced by amorphization, leading to efficient activation of C-H bonds and significant facilitation of HCOOH dissociation.
Article
Chemistry, Physical
Gunugunuri K. Reddy, Torin C. Peck, Charles A. Roberts
Article
Chemistry, Physical
Samji Samira, Siddharth Deshpande, Charles A. Roberts, Ayad M. Nacy, Joseph Kubal, Kristian Matesic, Owen Oesterling, Jeffrey Greeley, Eranda Nikolla
CHEMISTRY OF MATERIALS
(2019)
Article
Multidisciplinary Sciences
Ying Zhang, Xingfeng He, Zhiqian Chen, Qiang Bai, Adelaide M. Nolan, Charles A. Roberts, Debasish Banerjee, Tomoya Matsunaga, Yifei Mo, Chen Ling
NATURE COMMUNICATIONS
(2019)
Article
Chemistry, Applied
Charles A. Roberts, Vinod K. Paidi, Michael Shepit, Torin C. Peck, Kimber L. Stamm Masias, Johan van Lierop, Gunugunuri K. Reddy
Summary: A Cu-substituted, Co-based spinel catalyst was introduced for direct NO decomposition to N-2 and O-2. The catalyst demonstrated high reactivity and selectivity, as well as the ability to mitigate N2O formation. X-ray characterization revealed the effects of Cu substitution on the catalyst structure and activity.
Article
Chemistry, Physical
Torin C. Peck, Charles A. Roberts, Gunugunuri K. Reddy
Article
Chemistry, Physical
Vinod K. Paidi, Michael Shepit, John W. Freeland, Dale L. Brewe, Charles A. Roberts, Johan van Lierop
Summary: Oxygen vacancies and lattice oxygen on the surface of nanoparticles play crucial roles in the magnetism of transition metal oxides, with the interactions between the 2p orbitals of oxygen anions and the 3d orbitals of metal cations being of immense interest for specific electronic, magnetic, and chemical properties. The overall net magnetism differs significantly between O-2-rich and -deficient environments, impacting the exchange of O-h sites and adjusting the metal ion moments in monometallic and bimetallic spinel oxides.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Ying Zhang, Torin C. Peck, Gunugunuri K. Reddy, Debasish Banerjee, Hongfei Jia, Charles A. Roberts, Chen Ling
Summary: This study demonstrates the successful application of Bayesian optimization to improve the experimental measured catalytic activity as a direct function of compositional variables. Starting with 30 manually surveyed samples, 35 more samples were measured, and six oxides with higher specific activities were discovered.
Article
Chemistry, Applied
Siwen Wang, Honghong Lin, Yui Wakabayashi, Li Qin Zhou, Charles A. Roberts, Debasish Banerjee, Hongfei Jia, Chen Ling
Summary: Sluggish oxygen evolution reaction (OER) in acid conditions is a significant obstacle in the adoption of proton exchange membrane water electrolyzer for green hydrogen production. This study presents a high-throughput screening pipeline that uses density functional theory calculations and a transfer learning approach to predict critical properties of pyrochlore compounds, identifying potential candidates for acid OER applications and suggesting the compositional flexibility of pyrochlore compounds for various applications.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Vinod K. Paidi, Kimber L. Stamm Masiasi, Michael Shepit, Ryan D. Desautels, Charles A. Roberts, Johan van Lierop
ACS APPLIED NANO MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
V. K. Paidi, D. L. Brewe, J. W. Freeland, C. A. Roberts, J. van Lierop
Article
Chemistry, Physical
Torin C. Peck, Gunugunuri K. Reddy, Charles A. Roberts
CATALYSIS SCIENCE & TECHNOLOGY
(2019)