Article
Chemistry, Physical
L. Kaluza, R. Palcheva, K. Jiratova, G. Tyuliev, D. Gulkova, L. Dimitrov, G. Avdeev
Summary: Dispersed NiMo sulfide catalysts were successfully synthesized using TGA as a sulfiding agent in hydrothermal synthesis. Characterization and activity tests revealed that TGA increased the catalyst's surface area and redispersed active sites, thereby improving the catalyst's hydrodesulfurization activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Yanzeng Dong, Xiaohang Yu, Zhiheng Wang, Xin Li, Yanyan Liu, Ruiyao Gao, Songdong Yao
Summary: The effects of HY addition on the NiMoS active phase in NiMo(NH3) impregnated NiMo/Al2O3-HY catalyst and its role in 4,6-dimethyl-dibenzothiophene hydrodesulfurization were investigated. The results demonstrate that HY can enhance the HDS reaction by altering the morphology of NiMoS nanoclusters, even without involving the isomerization of 4,6-DMDBT. In the absence of strong acid sites, the turnover frequency (TOF) of the NiMo/Al2O3 catalyst was still improved by 90%.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Applied
Qiang Wei, Wenbin Huang, Xiaodong Liu, Anqi Li, Pengfei Zhang, Zhusong Xu, Zhiqing Yu, Xiaohan Wang, Haoran Liu, Yasong Zhou
Summary: A series of Re modified NiMo/Al2O3 hydrodesulfurization (HDS) catalysts with different contents of Re2O7 were synthesized using stepwise impregnation and co-impregnation methods. The effects of Re modification and impregnation methods on the catalysts' physical-chemical properties were characterized. The results revealed that Re modification improved the crystal morphologies, pore structures, and acid sites of the catalysts. Furthermore, the HDS evaluation showed that Re modification effectively enhanced the conversions, route selectivity, and even selectivity towards 3,3'-DMCHB of 4,6DMDBT, with the stepwise impregnation method exhibiting a more significant effect compared to co-impregnation.
Article
Energy & Fuels
Yuwadee Plaola, Wanwipa Leangsiri, Kanokthip Pongsiriyakul, Worapon Kiatkittipong, Atthapon Srifa, Jun Wei Lim, Prasert Reubroycharoen, Kunlanan Kiatkittipong, Apiluck Eiad-ua, Suttichai Assabumrungrat
Summary: This study investigated the catalytic activity and stability of Ni-MoS2 supported on different catalyst supports for the deoxygenation of different feedstocks. The results showed that the catalytic performance was influenced by both the purity of the feedstock and the characteristics of the catalyst supports. NiMo/γ-Al2O3 exhibited a high resistance to impure feedstock and excellent stability.
Article
Crystallography
Radostina Palcheva, Ludek Kaluza, Tanya Petrova, Lubomir Dimitrov, Daniela Karashanova, Georgi Tyuliev, Kvetuse Jiratova
Summary: In this study, tri-metallic NiMoW catalysts were prepared using sol-gel and hydrothermal methods, and the hydrodesulfurization (HDS) of thiophene and 4,6-dimethyldibenzothiophene (4,6-DMDBT) was investigated at different hydrogen pressures. The NiMoW/Al-HYDT catalyst exhibited the highest activity, with a pore size of 7.5 nm, while the sol-gel alumina catalyst (NiMoW/Al) had a pore size of only 4.8 nm.
Article
Chemistry, Multidisciplinary
Ryan M. Claydon, Luis A. Roman-Ramirez, Joseph Wood
Summary: The study shows that the Mo-MMO catalyst exhibits comparable reaction rates to Pd-2%/Al2O3 catalyst and significant advantage in cis-decalin production, offering the opportunity for generating more alkyl naphthenes in subsequent hydrodecyclization reactions. On the other hand, Pd catalysts supported on Al2O3 tend to preferentially produce trans-decalin due to the electronic properties of Pd catalysts influencing octalin intermediate orientations on the catalyst surface.
Article
Chemistry, Applied
Zhiheng Wang, Yanyan Liu, Xin Li, Ruiyao Gao, Jiong Sun, Jiankun Liu, Songdong Yao
Summary: This study utilized superabsorbent polymers (SAP) to adsorb zeolite sols and slurries, constructing C-HY composites. The synthesized C-HY composites proved to be effective supports for NiMo catalysts in hydrodesulfurization (HDS) reactions. By incorporating HY into the carbon substrate structure, the structural characteristics, morphology, acidity, and metal distribution of the HDS catalysts were changed. The introduction of HY into the carbon support increased the HDS reaction rate of NiMo/C by more than 1.2-1.5 times, with superior activity compared to traditional NiMo/Al2O3 catalysts.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Madis Lusi, Heiki Erikson, Alexey Treshchalov, Mihkel Rahn, Maido Merisalu, Arvo Kikas, Vambola Kisand, Vaino Sammelselg, Kaido Tammeveski
Summary: In this study, Pd nanoparticles were prepared on support materials using He/H(2) plasma jet treatment. The ORR kinetics of the Pd catalysts deposited on different support materials were explored. The results showed that nitrogen-doped graphene material slightly improved the ORR activity of the Pd catalyst, while Vulcan carbon-supported Pd catalyst exhibited higher specific activity for oxygen electroreduction.
Article
Chemistry, Physical
Can Li, Vishnu Sriram, Zhouyang Liu, Dale Brewe, Joo-Youp Lee
Summary: The Mo-V-based SCR catalyst showed good performance for Hg-0 oxidation and NO reduction under various conditions, with the best results observed using anatase TiO2 and a calcination temperature of 500 degrees Celsius. Various characterization techniques were used to investigate the effects of different parameters and conditions on the catalyst performance.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Nanoscience & Nanotechnology
M. Burhanuz Zaman, Rajaram Poolla, Shakeel Ahmad Khandy, Anchit Modi, Rajendra Kumar Tiwari
Summary: The work presents a rapid hydrothermal synthesis method for highly crystalline 2D SnS nanostructures, which show visible light sensitivity and potential photocatalytic activity against dyes such as methylene blue, rhodamine B, and methyl orange. The nanosheets exhibit good reusability and stability, making them promising for wastewater treatment applications.
Article
Crystallography
Jiliang Yang, Dandan Gong, Xinkang Lu, Cui Han, Hui Liu, Luhui Wang
Summary: Developing low-temperature nickel-based catalysts with good resistance to coking and sintering for dry reforming of methane (DRM) is of great significance. In this study, Ni-CeO2/SBA-15-G catalyst was successfully prepared by glycine-assisted impregnation method, which exhibited excellent catalytic performance with high CH4 conversion at low temperature and resistance to carbon deposition.
Article
Electrochemistry
S. M. Abu Nayem, Santa Islam, Md. Abdul Aziz, A. J. Saleh Ahammad
Summary: Electrochemical water splitting is a promising technology for sustainable and clean energy production by producing hydrogen. Molybdenum-based electrocatalysts, prepared using the hydrothermal method, exhibit high activity and stability across a wide pH range. This review provides a mechanistic insight into the hydrothermally prepared Mo-based electrocatalysts for overall water splitting, covering the fundamental processes of oxygen and hydrogen evolution. The review also discusses different types of Mo-based electrocatalysts and highlights novel strategies and challenges in developing high-performance electrocatalysts.
ELECTROCHIMICA ACTA
(2023)
Article
Acoustics
Zohal Safaei Mahmoudabadi, Alimorad Rashidi, Ahmad Tavasoli, Mehdi Esrafili, Mohammad Panahi, Mojtaba Askarieh, Saeed Khodabakhshi
Summary: A novel method using ultrasonication was developed to synthesize highly porous MoS2/graphene oxide (M-GO) nanocomposites, leading to increased specific surface area and improved HDS activity. Various characterization techniques were utilized to study the physicochemical properties and catalytic performance of the nanocatalysts, with high surface area M9-GO nanocatalyst showing the best catalytic performance compared to traditional catalyst Co-Mo/gamma Al2O3. Additionally, density functional theory calculations revealed that the GO substrate can stabilize MoS2 layers, promoting the direct desulfurization reaction in the hydrodesulfurization process.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Chemistry, Applied
Dragana Prokic-Vidojevic, Sandra B. Glisic, Jugoslav B. Krstic, Aleksandar M. Orlovic
Summary: The Re/Pd-TiO2/SiO2 aerogel catalysts synthesized using sol-gel method and super-critical drying showed higher catalytic activity in hydrodesulphurisation of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT) compared to Co/Mo-Al2O3/SiO2 aerogel catalysts. This can be attributed to well dispersed active phases, incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas in Re/Pd-TiO2/SiO2 aerogels.
Article
Chemistry, Physical
Yulin Li, Zhiying Liu, Xiao Li, Xiufeng Xu, Zhuyin Sui, Yaqin Hou, Zhanggen Huang
Summary: FeTi catalysts prepared with CTAB assistance showed good resistance to H2O and SO2 in selective catalytic reduction (SCR) at low temperatures. Catalyst deactivation was mainly caused by pore plugging and active phase sulfation, with SO2 inhibiting NO adsorption and NH3-NO reaction paths.
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)