Article
Chemistry, Inorganic & Nuclear
A. Vidal, F. Adamo, E. Iengo, E. Alessio
Summary: This study demonstrates the connection between the Ru(bda) water oxidation catalyst and porphyrin through two different modular strategies, showing a highly flexible synthetic approach.
INORGANICA CHIMICA ACTA
(2021)
Article
Thermodynamics
Chenghang Zheng, Hao Li, Yang Yang, Shuo Zhang, Xinning Yu, Qi Xin, Shaojun Liu, Xiang Gao
Summary: Catalytic oxidation with TiO2 doped with niobium and tungsten showed high activity in removing dichloromethane, but experienced deactivation due to the reaction between tungsten and chlorine. Loading RuO2 helped prevent this deactivation, improving resistance to Cl-poisoning and stability of the catalysts.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Engineering, Environmental
Jithin Gopakumar, Pal Martin Benum, Ingeborg-Helene Svenum, Bjorn Christian Enger, David Waller, Magnus Ronning
Summary: This study summarizes the use of a gamma-Al2O3 supported Ru catalyst for the oxidation of NO to NO2 in industrial nitric acid production. The catalyst exhibited high activity and kinetic parameters under nitric acid plant conditions, and the apparent activation energy and reaction mechanism were investigated.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Sharmila Pandey, Tanmoy Mandal, Sanajit Kumar Mandal
Summary: Three discrete Ru(II) complexes have been synthesized using different pyridine/pyrazine based tridentate ligands, with one bipyridine/phenanthroline and one chloride as co-ligands. The crystal structures of the complexes revealed monomeric structures. Density Functional Theory calculations showed different electronic properties and redox behavior for the complexes, depending on the ligands used. The catalytic behavior of the Ru-complexes was also influenced by the ligands, with different selectivity observed for oxidation reactions.
INORGANICA CHIMICA ACTA
(2023)
Article
Engineering, Chemical
Md. Mahmudul Hassan Mondol, Chul-Ung Kim, Chang Min Kim, Sung Hwa Jhung
Summary: ZrO2 supported on porous N-doped carbon (ZrO2@CN) with oxygen vacancy was prepared via carbonization of a composite of metal-azolate framework (MAF-6) and zirconium chloride (ZrCl4). The catalyst, ZrO2(2)@CN, exhibited high activity in oxidative desulfurization (ODS) with good recyclability, attributed to the effective production of & BULL;OH species through the synergy between Zr atom with O vacancy and N of carbon support for H2O2 activation. Therefore, ZrO2, especially ZrO2@CN with oxygen vacancy, can be suggested as a promising ODS catalyst.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Biswanath Das, Esteban A. Toledo-Carrillo, Guoqi Li, Jonas Stahle, Thomas Thersleff, Jianhong Chen, Lin Li, Fei Ye, Adam Slabon, Mats Gothelid, Tsu-Chien Weng, Jodie A. Yuwono, Priyank V. Kumar, Oscar Verho, Markus D. Karkas, Joydeep Dutta, Bjorn Akermark
Summary: In this study, a bifunctional and electrochemically regenerable molecular electrode was successfully developed for the stable production of hydrogen. By anchoring a highly active ruthenium electrocatalyst onto modified fluorine-doped carbon cloth, the electrode exhibited high activity for both oxygen evolution reaction and hydrogen evolution reaction in acidic conditions. The electrode design showed excellent electrochemical regeneration performance after prolonged use.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Applied
Zhiqiang Hao, Xiaohui Yue, Xiaoyu Zhou, Zhihong Ma, Zhangang Han, Jin Lin, Guo-Liang Lu
Summary: Reactions of Ru-3(CO)(12) with 6-methyl-2-pyridinyl-ethanol ligands resulted in the formation of trinuclear ruthenium clusters. The clusters were characterized by various techniques and their crystal structures were determined by X-ray diffraction analysis. The clusters exhibited efficient catalytic activity for the oxidation of saturated C-H bonds.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Applied
Pradip Debnath, Gouranga Sahu, Utpal C. De
Summary: A new synthesis method has been developed for the facile synthesis of structurally diverse pyrimidouracils using a dehydrogenative coupling reaction. This method is applicable to a broad range of substrates and has the potential to prepare valuable products that are currently difficult to access. The overall reaction sequence involves an efficient oxidation-imination-cyclization tandem process catalyzed by a ruthenium catalyst.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Jin Chen, Xuelong Lv, Wenjian Xu, Xiaolan Li, Jing Chen, Hongpeng Jia
Summary: This research discovered that using chlorine coordination can restore deactivated bimetallic catalysts and achieve widespread application in environmental catalysis. This method improves the activity and stability of the catalyst through homogeneous alloying.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Organic
Sesuraj Babiola Annes, Karuppaiah Perumal, Kalaiselvan Anandhakumar, Bhaskaran Shankar, Subburethinam Ramesh
Summary: A series of cascade reactions have been developed to produce functionalized aromatic heterocyclic compounds with pyrazole/ pyrazoline cores. These reactions involve a metal-free dehydrogenative process to produce in-situ benzaldehydes, which then react with other substances to form intermediate products. The intermediate products undergo several chemical processes, leading to the formation of biologically active pyrazolo[3,4b]pyridine and pyrazoline derivatives through a variety of possible reactions.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Maria Smyrnioti, Theophilos Ioannides
Summary: The study investigates the catalytic oxidation of dimethyl ether (DME) using copper ferrite catalysts synthesized via the citrate complexation method. The Fe0.67Cu0.33 catalyst showed the highest catalytic activity in DME oxidation due to its higher specific surface area and enhanced redox properties. The presence of highly dispersed copper species and the formation of spinel phase contributed to the enhanced catalytic performance.
Article
Chemistry, Physical
Nathalie Elia, Jane Estephane, Christophe Poupin, Bilal El Khoury, Laurence Pirault-Roy, Samer Aouad, Edmond Abi Aad
Summary: Nickel and ruthenium impregnated cerium oxide catalysts were tested for methanation of carbon dioxide. Ruthenium improved catalytic performance and produced a stable catalyst. At high gas pressure, CO2 conversion was close to thermodynamic equilibrium with 100% selectivity towards CH4 formation.
Review
Chemistry, Multidisciplinary
Simson Wu, Shik Chi Edman Tsang
Summary: N-cycle catalysis, utilizing nitrogen and hydrogen recycling in a chemical process, could have a profound impact on sustainable production of foods, chemicals, and fuels. Challenges for materials to efficiently catalyze the activation of N2 and renewable H2, as well as storing and transporting renewable energies, are of paramount importance. Highlighting the diverse roles of NH3 as fuel, fertilizer, and chemical vector, recent developments in ammonia synthesis and material decomposition for new processes are discussed.
TRENDS IN CHEMISTRY
(2021)
Article
Engineering, Environmental
Xiaohui Yu, Lingyun Dai, Yue Peng, Jiguang Deng, Yuxi Liu, Lin Jing, Xing Zhang, Zhiquan Hou, Jia Wang, Hongxing Dai
Summary: The study indicates that P-doping and H2O introduction can enhance the selectivity of HCl in the oxidation reaction of 1,2-dichloroethane, reducing the generation of chlorine-containing byproducts.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Xiaohui Yu, Lingyun Dai, Jiguang Deng, Yuxi Liu, Lin Jing, Xing Zhang, Xiyun Jiang, Zhiquan Hou, Jia Wang, Hongxing Dai
Summary: Ru nanoparticles supported on 3DOM SnO2 exhibited excellent catalytic activity for the oxidation of TCE and/or toluene. The high catalytic performance was attributed to the presence of hydroxyl groups, strong O-2 adsorption ability, low-temperature reducibility, and strong interaction between Ru NPs and 3DOM SnO2. The catalytic mechanism over xRu/3DOM SnO2 under dry and humid conditions was proposed, providing insights for the industrial application of Ru catalysts in the removal of Cl-containing volatile organic compounds.
JOURNAL OF CATALYSIS
(2021)
Article
Biochemistry & Molecular Biology
Mst Ara Gulshan, Md Motiar Rahman, Shigeyoshi Matsumura, Tsunehiko Higuchi, Naoki Umezawa, Yoshiya Ikawa
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2018)
Article
Biochemistry & Molecular Biology
Mst. Ara Gulshan, Shigeyoshi Matsumura, Tsunehiko Higuchi, Naoki Umezawa, Yoshiya Ikawa
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
(2018)
Article
Chemistry, Physical
Takashi Nishio, Yuko Yoshikawa, Wakao Fukuda, Naoki Umezawa, Tsunehiko Higuchi, Shinsuke Fujiwara, Tadayuki Imanaka, Kenichi Yoshikawa
Article
Multidisciplinary Sciences
Naomi Tsuburaya, Kengo Homma, Tsunehiko Higuchi, Andrii Balia, Hiroyuki Yamakoshi, Norio Shibata, Seiichi Nakamura, Hidehiko Nakagawa, Shin-ichi Ikeda, Naoki Umezawa, Nobuki Kato, Satoshi Yokoshima, Masatoshi Shibuya, Manabu Shimonishi, Hirotatsu Kojima, Takayoshi Okabe, Tetsuo Nagano, Isao Naguro, Keiko Imamura, Haruhisa Inoue, Takao Fujisawa, Hidenori Ichijo
NATURE COMMUNICATIONS
(2018)
Article
Chemistry, Multidisciplinary
Yosuke Hisamatsu, Naoki Umezawa, Hirokazu Yagi, Koichi Kato, Tsunehiko Higuchi
Article
Chemistry, Inorganic & Nuclear
Yoshinori Shirakawa, Yuuki Yano, Yuki Niwa, Kanako Inabe, Naoki Umezawa, Nobuki Kato, Yosuke Hisamatsu, Tsunehiko Higuchi
INORGANIC CHEMISTRY
(2019)
Article
Chemistry, Organic
Yosuke Hisamatsu, Takehiro Fukiage, Kojiro Honma, Andrii G. Balia, Naoki Umezawa, Nobuki Kato, Tsunehiko Higuchi
Article
Biochemical Research Methods
Natsumi Sumito, Shuhei Koeda, Naoki Umezawa, Yasumichi Inoue, Shinya Tsukiji, Tsunehiko Higuchi, Toshihisa Mizuno
BIOCONJUGATE CHEMISTRY
(2020)
Article
Chemistry, Multidisciplinary
Yosuke Hisamatsu, Koki Otani, Hiroshi Takase, Naoki Umezawa, Tsunehiko Higuchi
Summary: Interest is growing in the development and application of synthetic receptors that can recognize target biomolecules in aqueous media. A new tweezer-type synthetic receptor has been developed that shows significant fluorescence response upon complexation with heme in aqueous solution at pH 7.4. The synthetic receptor exhibits a supramolecular amphiphilic character, facilitating the formation of self-assembled aggregates.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Biochemistry & Molecular Biology
Tomoki Kitagawa, Takashi Nishio, Yuko Yoshikawa, Naoki Umezawa, Tsunehiko Higuchi, Chwen-Yang Shew, Takahiro Kenmotsu, Kenichi Yoshikawa
Summary: Polyamines play a role in various biological functions, with biphasic effects on gene expression observed at different concentrations. Among the naturally occurring tetravalent polyamines, thermospermine exhibits the strongest effects on DNA conformation and inhibition of gene expression activity.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Medicinal
Hiroki Kitagawa, Masaki Kikuchi, Shin Sato, Hisami Watanabe, Naoki Umezawa, Maiko Kato, Yosuke Hisamatsu, Takashi Umehara, Tsunehiko Higuchi
Summary: Peptides are promising drug candidates, but they are limited by susceptibility to degradation and inability to pass through cell membranes. This study developed a cell-permeable peptide inhibitor of LSD1/KDM1A using a strategy of temporary cyclization. The cyclized peptide showed enhanced stability to proteases and selective activation under reducing conditions in cells, effectively inhibiting proliferation of human acute myeloid leukemia cells.
JOURNAL OF MEDICINAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Taisei Amano, Hideki Inagaki, Yoshinori Shirakawa, Yuuki Yano, Yosuke Hisamatsu, Naoki Umezawa, Nobuki Kato, Tsunehiko Higuchi
Summary: Cytochrome P450 selectively hydroxylates specific positions of fatty acids. A new synthetic strategy involving the introduction of eight bulky aryl groups at the 2,6-positions of the meso-phenyl groups after construction of the porphyrin skeleton greatly improved catalyst yield, resulting in Ru complexes with higher turnover numbers and unique selectivity.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2021)
Article
Chemistry, Physical
Wakao Fukuda, Mamoru Osaki, Yusuke Yasuda, Ryota Hidese, Tsunehiko Higuchi, Naoki Umezawa, Shinsuke Fujiwara, Eiichi Mizohata
Summary: In this study, the polyamine biosynthesis pathway of the facultative anaerobic hyperthermophilic crenarchaeon Pyrobaculum calidifontis was predicted. The study also discovered that an aminopropyltransferase from P. calidifontis (Pc-SpeE) is capable of synthesizing thermospermine and spermine. Furthermore, it was found that norspermidine is produced from thermospermine by an unknown polyamine oxidase/dehydrogenase and Pc-SpeE.
Article
Chemistry, Multidisciplinary
Yosuke Hisamatsu, Fangzhou Cheng, Katsuhiro Yamamoto, Hiroshi Takase, Naoki Umezawa, Tsunehiko Higuchi
Summary: In this study, a new amphiphilic 4-aminoquinoline (4-AQ)-tetraphenylethene (TPE) conjugate was reported, which exhibited kinetically controllable stepwise self-assembly and the ability to switch its kinetic nature in response to pH. The self-assembly process of the 4-AQ amphiphile involved the formation of sphere-like nanoparticles, a transition to short nanofibers, and their growth to long nanofibers at room temperature. The time scale of the self-assembly process varied depending on the pH-responsiveness of the 4-AQ moiety.
Article
Chemistry, Multidisciplinary
Shota Teramae, Akane Kito, Tomoteru Shingaki, Yu Hamaguchi, Yuuki Yano, Takamori Nakayama, Yuko Kobayashi, Nobuki Kato, Naoki Umezawa, Yosuke Hisamatsu, Tetsuo Nagano, Tsunehiko Higuchi
CHEMICAL COMMUNICATIONS
(2019)
