Article
Chemistry, Applied
Perla Castillo-Villalon, Jorge Ramirez, Alejandro Reyes-Sosa, Aida Gutierrez-Alejandre, Eddy Leyva-Ramirez, Rogelio Cuevas, Alejandra Toledo-Duran
Summary: The study reveals the significant role of cobalt sulfide in hydrodesulfurization catalysis, emphasizing its importance in achieving highly active catalysts.
Article
Energy & Fuels
Zhiqing Yu, Xiaohan Wang, Haoran Liu, Wenbin Huang, Kaixin Deng, Xiaoyue Liu, Zhihua Xiao, Qiang Wei, Yasong Zhou
Summary: By modifying the cube MgO with different weight percent of activated carbon, the introduction of non-homogeneous carbon layers can increase the number of stacking layers of MoS2 and shorten its length, which is beneficial for the formation of type II CoMoS active phase. The highest HDS conversion rate of 84.71% was achieved over the CoMo/M@AC-0.2 catalyst at 300℃ and 8 h-1 conditions, which was 32.78% higher than that of the CoMo/Al2O3 catalyst.
Article
Engineering, Chemical
Zhentao Chen, Yaxin Liu, Jian Chen, Yang Zhao, Tao Jiang, Fangyu Zhao, Jiahuan Yu, Haoxuan Yang, Fan Yang, Chunming Xu
Summary: In this study, a series of CoMo/NDC@alumina catalysts were synthesized, and the optimal catalyst with 25% 1,10-phenanthroline additive was determined through property characterization and HDS active test. The CoMoS active phase and sulfidation degree of the optimal catalyst were improved compared to CoMo/gamma-Al2O3.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Miroslav Zdrazil, Ludek Kaluza
Summary: In this study, impregnation solutions for NTA-modified CoMo/Al2O3 hydrodesulfurization catalysts were prepared without unnecessary NH4+ and NO3- ions. The catalysts prepared by the DISUSPEN method showed higher activity in the HDS reaction of thiophene and produced fewer nitrogen-containing emissions during in-situ sulfidation compared to catalysts prepared by the conventional DISAMON method.
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
Engineering, Chemical
Maryam Soleymani, Ramin Karimzadeh, Alimorad Rashidi, Ali Eslamimanesh
Summary: The aim of this research is to evaluate the effects of various parameters on the synthesis of a Fe-Mo catalyst supported on mesoporous activated carbon. Mesoporous carbon was prepared from grape branches and oil palm trunks, and optimum values of activation time and drying period were determined. The synthesized catalyst with an efficient support exhibited higher sulfur conversion efficiency for heavy naphtha hydrodesulfurization compared to a catalyst with a commercial support.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Min Zhou, Yifeng Zeng, Yang Liu, Yi Sun, Fei Lu, Xiuyun Zhang, Rongxing Cao, Yuxiong Xue, Xianghua Zeng, Yongping Wu
Summary: This study reports a unique Ni-Mo based metal/oxide heterostructure catalyst with abundant mesopores, which exhibits extensive exposure of interfacial Ni atoms and remarkable activity in alkaline hydrogen evolution reaction. The synthetic strategy can also be extended to synthesize other metal/oxide heterostructures with remarkable oxygen evolution reaction performance.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Applied
Siyu Zheng, Hongye Qin, Xuejie Cao, Tongzhou Wang, Wenbo Lu, Lifang Jiao
Summary: Combining urea oxidation reaction (UOR) with hydrogen evolution reaction (HER) is an effective method for energy saving and highly efficient electrocatalytic hydrogen production. In this study, molybdenum-incorporated cobalt carbonate hydroxide nanoarrays were designed and synthesized as a bifunctional catalyst, exhibiting outstanding catalytic performance and durability in both UOR and HER reactions.
JOURNAL OF ENERGY CHEMISTRY
(2022)
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
Energy & Fuels
Cen Zhang, Yicen Zhang, Huiting Zheng, Jundong Xu, Xinyi Liu, Jing Cao, Congshan Zhou
Summary: A phosphorous modification method was reported to improve the HDS activity and selectivity of CoMo/δ-Al2O3 catalyst simultaneously. The enhanced HDS performance was attributed to weakened metal-support interaction, resulting in the formation of a large amount of active (Co)MoS2 phase with higher stacking and Co promotion degree. The improved Co promotion degree promotes the HDS activity, while increased stacking decreases the olefin hydrogenation activity. When applied to a real FCC naphtha, the sulfur content could be reduced to 5.4 ppm with only a total research octane number loss of 0.7 units.
Article
Green & Sustainable Science & Technology
Hongcai Su, Mi Yan, Shurong Wang
Summary: Supercritical water gasification (SCWG) is an efficient technology for converting wet biowaste into energy, with transition metal-based catalysts playing an important role in promoting hydrogen production rate. Researchers have focused on improving the catalytic performance and recyclability of these catalysts for their applications in SCWG of biowaste.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Chemistry, Inorganic & Nuclear
Juejin Teng, Zhixin Dong, Daokun Liu, Xiao Zhang, Jinxue Guo
Summary: Surface reconstruction with enhanced catalysis activity in hydrogen evolution reaction (HER) catalysts has been rarely observed in previous studies. In this research, Mo species dissolved from NiMoO4-CoO by activating the catalyst, leading to the formation of K2Mo3O10 on the catalyst surface. The reconstruction not only increased active sites and enhanced charge transfer, but also improved intrinsic activity per catalysis site, resulting in high HER activity with ultralow overpotentials at high current densities.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Physical
Xingsheng Hu, Qizhao Wang, Yan Li, Yan Meng, Lei Wang, Houde She, Jingwei Huang
Summary: In this work, Mo-doped BiVO4 and Co-Ci prepared by PED were used to enhance the performance of the photoanode, leading to improved photocurrent density and IPCE. The surface hydrophilicity and water oxidation kinetics were successfully improved, providing a new approach for enhancing BiVO4 used for water splitting.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Environmental
Haoran Yu, Changmin Liu, Shuo Liu, Yu Gu, Shuya Wang, Ali Yaras, Linchao Hu, Wenyi Zhang, Mingguo Peng, Hasan Arslanoglu, Linqiang Mao
Summary: This study proposed an efficient method for the recovery of Mo and Ni from spent petroleum refining catalyst through O2-rich roasting and organic acid leaching. The method has the advantage of producing less high salinity wastewater, making it environmentally-friendly.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Materials Science, Characterization & Testing
M. Kostejn, R. Fajgar, V. Drinek, V. Jandova, F. Novotny
JOURNAL OF NONDESTRUCTIVE EVALUATION
(2020)
Article
Chemistry, Analytical
Lucie Kostejnova, Jakub Ondracek, Petra Majerova, Martin Kostejn, Gabriela Kuncova, Josef Trogl
Summary: The study demonstrated the control of glucose concentration using feedback regulation with an in situ optical fiber glucose sensor and preimmobilized glucose oxidase in the ORMOCER(R) polymer. The system showed fast response times and low deviation in controlling low glucose concentrations and maintaining desired glucose levels in a laboratory bioreactor. The durable and long-lasting sensitive layer of the sensor indicates potential applications in various biotechnological processes such as production of low glucose content beverages.
Article
Environmental Sciences
Pavel Topka, Kvetuse Jiratova, Michaela Dvorakova, Jana Balabanova, Martin Kostejn, Frantisek Kovanda
Summary: This study aimed to develop a novel method for preparing structured Co-Mn mixed oxide catalysts by depositing the active phase on stainless steel meshes through hydrothermal synthesis. The catalysts exhibited significantly higher catalytic activity in ethanol oxidation compared to commercial pelleted Co-Mn-Al catalysts, with the activity correlating with the proportion of surface oxygen vacancies determined by XPS. The exceptional activity of the catalyst with a Co:Mn ratio of 0.5 was attributed to the high number of oxygen vacancies and exceptional redox properties.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
K. Pacultova, A. Klegova, K. Karaskova, D. Fridrichova, T. Bilkova, M. Kostejn, L. Obalova
Summary: Experimental results showed that the presence of oxygen during activation did not significantly affect the NO conversion rate, but the presence of O-2 in the inlet gas mixture had a significant inhibiting effect, indicating that the impact of oxygen is more reflected in the composition of the inlet gas. During the reaction process, oxygen desorption was the slowest reaction step, while N-2 desorption was fast.
MOLECULAR CATALYSIS
(2021)
Article
Nanoscience & Nanotechnology
Vladislav Drinek, Stanislav Tiagulskyi, Roman Yatskiv, Jan Grym, Radek Fajgar, Vera Jandova, Martin Kostejn, Jaroslav Kupcik
Summary: Chemical vapor deposition was used to synthesize nanostructured deposits consisting of nanoballs, irregular particles, and nanowires. Analysis techniques revealed that the nanowires had a complex structure with a thin crystalline germanium core and amorphous CrGex coating. The resistance of the nanowire-deposit system was determined to be 2.7 k Omega.cm using a unique vacuum contacting system.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2021)
Article
Chemistry, Physical
Kveta Jiratova, Roman Perekrestov, Michaela Dvorakova, Jana Balabanova, Martin Kostejn, Martin Vesely, Martin Cada, Pavel Topka, Dana Pokorna, Zdenek Hubicka, Frantisek Kovanda
Summary: Magnetron sputtering is an advantageous method for preparing catalysts supported on stainless steel meshes, particularly for processes carried out at high space velocities. The CoOx-MnOx and CoOx-CoMnOx catalysts showed high catalytic activity on stainless steel meshes, with the thinnest layer displaying the highest catalytic activity. Compared to the commercial pelletized Co-Mn-Al mixed oxide catalyst, the sputtered catalysts demonstrated significantly higher catalytic activity despite lower content of the Co and Mn active components.
Article
Chemistry, Physical
Miroslav Zdrazil, Ludek Kaluza
Summary: In this study, impregnation solutions for NTA-modified CoMo/Al2O3 hydrodesulfurization catalysts were prepared without unnecessary NH4+ and NO3- ions. The catalysts prepared by the DISUSPEN method showed higher activity in the HDS reaction of thiophene and produced fewer nitrogen-containing emissions during in-situ sulfidation compared to catalysts prepared by the conventional DISAMON method.
Article
Multidisciplinary Sciences
Petr Praus, Lenka Rehackova, Jakub Cizek, Aneta Smykalova, Martin Kostejn, Jiri Pavlovsky, Miroslava Filip Edelmannova, Kamila Koci
Summary: This study synthesized C3N4 from nitrogen-rich precursors, forming vacancy complexes that are beneficial for hydrogen generation, and the photocatalyst exhibited higher performance than bulk C3N4 synthesized in air.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Coatings & Films
Tomas Krenek, Theresia Stich, Denitsa Docheva, Petr Mikysek, Martin Kostejn, Vera Jandova, Radek Fajgar, Michal Pola, Tomas Kovarik, Denys Moskal, Jana Forejtova, Josef Pola
Summary: This study characterizes the hydrolytic stability and impact of CaTiO3 coats on various substrates in air and aquatic media. The study also evaluates the effects of these coats on human mesenchymal stem cells. It emphasizes the importance of considering the hydrolysis phenomenon when interpreting the properties of CaTiO3 surfaces.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Petr Praus, Aneta Smykalova, Daniel Cvejn, Sandra Losertova, Martin Kostejn, Vlastimil Novak
Summary: By surface modification of graphitic carbon nitride (g-C3N4), the pore size distribution and surface structure could be altered, resulting in improved photocatalytic activity. Among the doping agents, the photocatalyst prepared through the reaction of PCl3 and pyridine showed the highest activity.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Physical
Ludek Kaluza, Karel Soukup, Martin Kostejn, Jindrich Karban, Radostina Palcheva, Marek Laube, Daniela Gulkova
Summary: The effects of different supports on the performance of NiMo sulfide catalysts were investigated. It was found that acidic mesoporous SiO2-Al2O3 exhibited higher activity, while activated carbon support showed outstanding stability.
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, Inorganic & Nuclear
Tomas Krenek, Lukas Vala, Rostislav Medlin, Josef Pola, Vera Jandova, Veronika Vavrunkova, Petr Mikysek, Petr Belsky, Martin Kostejn
Summary: Despite advanced research on functional colloidal inorganic nanoparticles and their reactivity, room temperature reactive interactions between two different colloids have been challenging. Laser ablation of titanium monoxide and silicon monoxide allows the generation of stable colloidal nanoparticles, leading to the formation of TiSi2 through room temperature reactive interactions between the two colloidal species.
DALTON TRANSACTIONS
(2022)
Article
Nanoscience & Nanotechnology
Halyna Starukh, Martin Kostejn, Vlastimil Matejka, Petr Praus
Summary: By adsorbing silver cations on the surface of exfoliated graphitic carbon nitride (CNE) and reducing them to form silver nanoclusters (NCs), the photocatalytic activity of CNE was enhanced and recombination of photoinduced electrons and holes was reduced. This study demonstrates the capability of CNE to act as a platform for simple and rapid synthesis of Ag NCs without the need for stabilizing compounds.
NANOSCALE RESEARCH LETTERS
(2021)
