Article
Engineering, Chemical
Xin Zhang, Wei-Kun Jiang, Bao-Ju Wang, Xiang-Yang Cui, Zhi-Yong Tang, Hai-Kui Zou, Guang-Wen Chu, Yong Luo
Summary: The intrinsic kinetics of catalytic hydrogenation of p-nitroanisole (PNA) to p-aminoanisole have been investigated in this study. Experimental and theoretical analyses were conducted under different conditions to determine the kinetic characteristics. Power law analysis revealed reaction orders for hydrogen and PNA, and Eley-Rideal and Langmuir-Hinshelwood-Hougen-Watson (LHHW) models were used to fit the data. The adsorption of dual-site dissociative H2 was identified as the rate-controlling step based on the LHHW model.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Honglei Liu, Cunhui Zhou, Wenqian Li, Wanting Li, Minghuang Qiu, Xinqing Chen, Hui Wang, Yuhan Sun
Summary: This study successfully developed a gamma-Al2O3-supported Rh-Ni bimetallic catalyst with only 0.1 wt % Rh, which exhibited excellent catalytic performance in the hydrogenation of NEC. Various characterizations confirmed that factors such as electron transfer between the bimetallic Rh-Ni nanoparticles structure, promotion of smaller Ni nanoparticles formation by Rh, and increased reducibility of loaded NiO contributed to the catalyst's outstanding activity. The research sheds light on a promising strategy for developing low-cost hydrogenation catalysts for LOHCs such as NEC.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Energy & Fuels
Jiaming Shi, Xiaoran Liu, Xuefeng Bai
Summary: Ultrafine Ru nanoparticles supported on N-doped exfoliated Ni-Fe layered double hydroxide nanosheets were prepared by nitrogen glow discharge plasma without chemical stabilizers or reducing agents.The experimental results show high catalytic activity and hydrogen storage capacity of the Ru/Ni-Fe LDH catalyst, with 100% NEC conversion and good selectivity towards 12H-NEC.
Article
Materials Science, Multidisciplinary
Yi Yin, Yuanhong Qi, Bo Li, Hu Gu, Jinghui Zhao, Liqiang Ji, Bo Zhang, Zeming Yuan, Yanghuan Zhang
Summary: In this study, Mg-Zn-Ni and Mg-Cu-Ni alloys with different NbF5 contents were synthesized, and the effects of NbF5 on microstructure and hydriding/dehydriding kinetics were discussed. The results show that NbF5 can promote microstructural evolution, reduce dehydrogenation activation energies, and significantly improve hydriding/dehydriding kinetics.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Wenjie Xue, Hongxia Liu, Binbin Zhao, Lixia Ge, Shuai Yang, Minghuang Qiu, Jiong Li, Wei Han, Xinqing Chen
Summary: The researchers successfully designed an atomic dispersion structure of rhodium and cobalt nanoparticles for the hydrogenation of NEC and dehydrogenation of 12 H-NEC, enabling reversible hydrogen uptake and release. The catalyst achieved complete hydrogenation of NEC at a low temperature of 90 degrees Celsius, representing one of the lowest reported temperatures for the total hydrogenation of NEC. The excellent catalytic performance of the Rh1Co catalyst is attributed to the optimal electronic structure between the atomic dispersion of rhodium and cobalt nanoparticles, allowing fast electron transfer to intermediates.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Bin Wang, Qian Dong, Si-Yao Wang, Pei-Ya Li, Shi-Yuan Wang, Shu-Han Lu, Tao Fang
Summary: This study synthesized a Ni-Mo alloy catalyst supported by commercial activated carbon and optimized its ratio and preparation conditions. The results showed that Mo doping significantly promoted the hydrogenation reaction of N-ethylcarbazole. The catalyst achieved high hydrogenation rate in a short time and effectively improved the selectivity of fully hydrogenated products.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Cong Peng, Qingan Zhang
Summary: In this study, a high-efficient catalyst comprising of YCxFy nanosheets-supported Ni nanoparticles was designed to address the sluggish kinetics and poor cyclic stability of MgH2. The as-achieved MgH2-10 wt.% Ni-30/YCxFy composite exhibits superior hydrogen desorption kinetics and high capacity retention. The in situ formed Mg2NiH4 and YH3 catalytic phases accelerate the hydrogen desorption kinetics, while the dispersed MgF2 and carbon species prevent the crystallite growth, particle aggregation, and catalyst redispersion, contributing to an excellent cyclic stability.
Article
Engineering, Environmental
Wenjie Xue, Hongxia Liu, Baohua Mao, Honglei Liu, Minghuang Qiu, Chengguang Yang, Xinqing Chen, Yuhan Sun
Summary: Hydrogen, a promising candidate to replace fossil fuels, faces challenges in storage. A new reusable bimetallic Pd-Rh nanoparticles (NPs) catalyst shows potential for high-weight% hydrogen storage. The mechanism proposed for NEC hydrogenation over the Pd-Rh catalyst opens avenues for the development of LOHCs as energy vectors.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Chemistry, Physical
Zhuohua Sun, Zhe-Hui Zhang, Tong-Qi Yuan, Xiaohong Ren, Zeming Rong
Summary: This review explores the history, synthetic strategies, and controls of Raney Ni catalysts, with a focus on their applications in biomass conversion. By comparing with supported Ni catalysts, the unique advantages of Raney Ni in biomass conversion are revealed.
Article
Engineering, Environmental
Lei Zuo, Junfeng Wang, Deqing Mei, Derick Adu-Mensah, Yaping Gao
Summary: The study investigated the ultrasonic-assisted CTH process for biodiesel, which effectively controlled the generation of C18:0 and trans-C18:1. The optimum reaction conditions were found to be reaction temperature of 80°C, stirring rate of 600 rpm, catalyst dosage of 10 wt%, isopropanol amount of 32 g, and water amount of 100 g. The ultrasonic field reduced the selectivity of trans-C18:1 and decreased the iodine value of biodiesel.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Shuo Yu, Hui Yong, Yang Zhao, Shuai Wang, Yiwan Chen, Jifan Hu, Baosheng Liu, Yanghuan Zhang
Summary: The Mg90Ce5Y5 + x wt. % Ni MOF (x = 0, 3) composites were successfully prepared and the synergistic catalytic effects of Ni MOF catalyst doping and RE alloying on the hydrogen storage properties of pure Mg were investigated. The N3 sample exhibited an absorption of about 3.05 wt. % H2 at 473 K within 2 min, while the pure Mg showed almost no reaction under the same conditions. The Edes of N3 was calculated to be 69.0 & PLUSMN; 3.9 kJ/mol, much lower than that of pure MgH2 (160 kJ/mol). The improved hydrogen storage kinetics can be attributed to the CeH2.73 and YH2 phases providing nucleation sites and diffusion channels inside the particle, as well as the additional Ni active positions, defects, and cracks facilitating H2 dissociation/recombination generated by Ni MOF on the particle surface.
Article
Engineering, Chemical
Xiang Yang Cui, Xin Zhang, Baoju Wang, Yu-Qi Sun, Hai Kui Zou, Guang Wen Chu, Yong Luo, Jian Feng Chen
Summary: In this study, the kinetic models of NMA hydrogenation to AMA catalyzed by Raney nickel catalyst were investigated. The reaction was found to follow 0.52-order kinetics with respect to the NMA concentration and 1.10-order kinetics in terms of hydrogen pressure. Based on the LHHW model, the dual-site dissociation adsorption of hydrogen was identified as the rate determining step.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Bin Wang, Pei-ya Li, Qian Dong, Li-qin Chen, Hai-qiang Wang, Pei-long Han, Tao Fang
Summary: This paper discusses the preparation of four kinds of Ni/Co bimetallic catalysts and their effects on the hydrogenation performance of NEC. The results show that the addition of 50% cobalt achieves the most significant hydrogenation activity, with 100% NEC conversion and 98.99% 12H-NEC selectivity. The catalyst exhibits a hydrogenation capacity of 5.77 wt % at a reduction temperature of 450 degrees C. The synergistic interaction between Ni/Co metals is identified as the key factor for the remarkable catalytic activity. The development and application of highly efficient nonprecious metal hydrogenation catalysts contribute to the commercialization of LOHC technology.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Bin Wang, Pei-ya Li, Qian Dong, Li-qin Chen, Hai-qiang Wang, Pei-long Han, Tao Fang
Summary: This paper prepared four kinds of Ni/Co bimetallic catalysts with different proportions by the impregnation method. The effects of the Ni/Co molar ratio and the reduction temperature on the hydrogenation performance of N-ethylcarbazole (NEC) were studied. The design and application of highly efficient nonprecious metal hydrogenation catalysts provide more feasibility to promote the commercial development of liquid organic hydrogen carrier technology.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Chemical
Santulla Leide Bernardes Vasconcelos Carvalho, Eliane Bezerra de Moraes Medeiros, Ayrton de Souza Wanderley, Luccas de Moura Ribeiro, Julia Gabriela da Silva, Ivana Taciana de Almeida Simoes, Nathalia Cecilia do Rego Lemos, Nelson Joaquim Ribeiro Neto, Cesar Augusto Moraes de Abreu, Henrique Macedo Baudel, Nelson Medeiros de Lima Filho
Summary: The conversion of xylose to xylitol was successfully achieved through catalytic reactions using heterogeneous catalysts based on Ni and Ru, involving acid hydrolysis and hydrogenation processes. It was found that in the acid hydrolysis process for xylose extraction, a higher concentration of sulfuric acid led to better results, while in the xylose hydrogenation process, both the conversion rate of xylose and the selectivity to xylitol were close to 90% after 1 hour of reaction.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)