Article
Chemistry, Physical
Jihyeon Lee, Byung Gwan Park, Kiheon Sung, Hyeongeon Lee, Jihun Kim, Eonu Nam, Jeong Woo Han, Kwangjin An
Summary: This study investigates the reversible hydrogenation and dehydrogenation processes in a liquid organic hydrogen carrier (LOHC) system using a single-catalyst approach. Key hydrogen-involved catalytic behaviors, such as adsorption and migration, play crucial roles in reactivity. The findings demonstrate that employing a defective metal oxide support can facilitate these behaviors at the active sites on the catalyst surface during the LOHC process.
Article
Chemistry, Physical
Guilin Zhou, Tao Li, Jiongyi Chen, Lidan Deng, Hongmei Xie
Summary: Different preparation methods of Nano-CeO2 supports were used to prepare nano-Pd/CeO2 catalysts, showing excellent catalytic performance in benzene hydrogenation and cyclohexane dehydrogenation reactions. The synergy between metal Pd, CeO2 support, and their structures effectively promotes hydrogen storage capacity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Joori Jung, Byeong Soo Shin, Jeong Won Kang, Won-Sik Han
Summary: In efforts to develop hydrogen-rich organic materials for renewable energy, four new materials based on N-alkyl-bis(carbazole) were designed and prepared, showing varying hydrogen adsorption/hydrogen desorption reactivity based on the length of the alkyl chain. These materials demonstrated complete hydrogenation reactions under ruthenium catalyst and thermal stability without decomposition at certain temperatures.
Article
Chemistry, Physical
Carmen Mejuto, Laura Ibanez-Ibanez, Gregorio Guisado-Barrios, Jose A. Mata
Summary: This study describes an effective visible-light-promoted iridium catalyst that enables hydrogen production at room temperature without additives. The single iridium complex in the photocatalytic system plays a dual role in harvesting visible light and facilitating C-H cleavage and H-2 formation. The presence of specific ligands in the iridium complex is crucial for the photocatalytic transformation, and the complex also acts as an efficient catalyst for thermal reverse process under mild conditions.
Review
Chemistry, Physical
Mingxu Liu, Yuankang Xu, Yu Meng, Lijiao Wang, Hang Wang, Yichao Huang, Naoya Onishi, Lin Wang, Zhuangjun Fan, Yuichiro Himeda
Summary: Given the drastic increase of global carbon dioxide, renewable energy is crucial for maintaining worldwide economic growth. This review focuses on the development of a hydrogen storage system based on formic acid (FA) through CO2 hydrogenation and FA dehydrogenation. Metal catalysts at the nanoscale and single-atom scale are highlighted, as well as the effects of metal size on catalytic activities. The review also emphasizes the structure-activity relationships of various supported catalysts and provides mechanistic insights for rational catalyst design.
ADVANCED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Hyojeong Park, Jinho Oh, Thanh-Binh Nguyen, Jung Kyoo Lee
Summary: The hydrogen storage and release characteristics of simulated light cycle oil (Sim-LCO) were studied and compared to a toluene/methylcyclohexane pair. Sim-LCO showed a higher H2 storage capacity and release of hydrogen compared to toluene. However, the dehydrogenation activity of the platinum catalyst needs improvement.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Multidisciplinary
Kwanyong Jeong, Sunil Kwon, Hyunwoo Yook, Jeong Jae Lee, Ju Seong Lee, Myungho Choi, Hyung Seob Lim, Sang-Joon Kim, Soo Min Kim, Jeong Woo Han, Ji Hoon Park
Summary: Liquid organic hydrogen carrier (LOHC) technology enables safe and convenient storage and transportation of hydrogen in large quantities. This study proposes a promising LOHC candidate, 1-(n-phenylethyl)naphthalene (PEN), which exhibits high hydrogen storage capacity, superior physical properties, and low cost. PEN showed reversible hydrogen storage and release performance, and the dehydrogenation performance can be enhanced by controlling the composition of stereo isomers.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
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)
Article
Chemistry, Physical
Shuhua Zhou, Wei Zhang, Wenfeng Wang, Yaokun Fu, Han Yu, Lu Zhang, Jianzheng Song, Ying Cheng, Shumin Han
Summary: A novel method involving cosintering of an organic material, pure Mg, and a hydriding combustion synthesis technique has been reported to prepare MgH2 with amorphous carbon, resulting in significantly improved dehydrogenation capacity and kinetics compared to pure MgH2.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Chemistry, Organic
I. A. Makaryan, I. Sedov
Summary: This study analyzes the state of the art in studying catalysts for the hydrogenation/dehydrogenation of organic substrates as components of modern hydrogen storage systems based on liquid organic carriers. It discusses reducing noble metal content, replacing them with cheaper transition metals, using various supports, and enhancing catalyst activity, stability, and selectivity, as well as regenerating spent catalytic systems.
PETROLEUM CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Alexander N. Kalenchuk, Leonid M. Kustov
Summary: The kinetics of dehydrogenation reactions of polycyclic naphthenes were simulated based on real experimental data. It was found that the reaction of the 1st order predominates in the series of cyclohexane-bicyclohexyl-perhydroparatherphenyl. However, for other substrates, the probability of describing the reaction using the 2nd order equation increases significantly, with the trans-decalin reaction becoming the predominant form of describing the kinetics.
Article
Energy & Fuels
Nikolay E. Galushkin, Nataliya N. Yazvinskaya, Dmitriy N. Galushkin
Summary: This paper proposes a high-capacity hydrogen storage system based on the study of hydrogen accumulation in the electrodes of nickel-cadmium batteries. It is found that hydrogen accumulates in large quantities in the electrodes and exists in the form of metal hydrides in metal-ceramic matrices. The experimental results show that the capacity of the metal-ceramic matrices exceeds the standards set by the US DOE and can be further increased by the thermal runaway process. Therefore, this HSS system can not only meet the requirements of the US DOE but also exceed them.
Article
Chemistry, Physical
Amit Kumar Chawla, Shikha Wadhwa, Arka Bikash Dey, Florian Bertram, Saif A. Khan, Ratnesh Pandey, Mukul Gupta, Vipin Chawla, Akula Umamaheswara Rao, D. K. Avasthi
Summary: This study focuses on the synthesis of Pd-Ag nano-composite films by magnetron cosputtering and the structural changes in the alloy film during hydrogenation and dehydrogenation processes. Synchrotron X-ray diffraction was used to reveal subtle structural changes occurring, showing that adding Ag to Pd can completely remove dissolved hydrogen. Lower concentrations of Ag in Pd exhibit better performance during hydrogenation/dehydrogenation processes.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Dinabandhu Patra, Ramakrishnan Ganesan, Balaji Gopalan
Summary: The catalytic enhancement of hydrogen generation during Fe3O4@Pd core-shell nanoparticles catalyzed tandem reaction is attributed to both in situ formation of Fe(0) and the presence of nitroarenes substrates. The rate of hydrogen generation from ammonia borane depends on the nitroarene substrate, with 4-nitrophenol showing higher activity due to differences in adsorption on the catalyst surface. The electronic connection between Fe and Pd interface plays a crucial role in the enhanced catalytic performance of the tandem reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Materials Science, Multidisciplinary
Leonid M. Kustov, Alexander N. Kalenchuk
Summary: The design of benign and safe hydrogen storage systems is crucial for the development of new energy carriers. This article discusses the storage of hydrogen in chemical compounds, specifically focusing on aromatic hydrocarbons capable of reversible hydrogenation-dehydrogenation reactions.
Article
Chemistry, Inorganic & Nuclear
Yaxu Liu, Thomas Scattolin, Alberto Gobbo, Marek Belis, Kristof Van Hecke, Steven P. Nolan, Catherine S. J. Cazin
Summary: The synthesis of a series of stable Pd(II)-NHC pre-catalysts with excellent catalytic activity in Suzuki-Miyaura and Buchwald-Hartwig reactions has been successfully achieved in this study, especially when IPrCl is employed as an ancillary ligand. The [Pd(IPr*)Cl(1-Bu-t-indenyl)] complex also exhibited optimal catalytic activity in the challenging Suzuki-Miyaura reaction between esters and arylboronic acids under very mild reaction conditions.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Review
Biochemistry & Molecular Biology
Marre Porre, Gianmarco Pisano, Fady Nahra, Catherine S. J. Cazin
Summary: Research has shown that α-haloketones play a crucial role in the synthesis of complex heterocycles and pharmacological compounds, and efforts have been made to improve their synthetic methods in terms of sustainability.
Article
Chemistry, Applied
Eleni Sioriki, Emmy Tuenter, Davy Van de Walle, Valerie Lemarcq, Catherine S. J. Cazin, Steven P. Nolan, Luc Pieters, Koen Dewettinck
Summary: Alkalization process can improve the color, dispersibility and flavor of cocoa powder, but may reduce the content of phytochemicals, bitterness and astringency. Furthermore, alkalization reduces the levels of volatile compounds, affecting the sensory properties of cocoa powder.
Article
Chemistry, Multidisciplinary
Francis Bru, Mathieu Lesieur, Albert Poater, Alexandra M. Z. Slawin, Luigi Cavallo, Catherine S. J. Cazin
Summary: The synthesis and isolation of [Pd(NHC)(PhC equivalent to CPh)] complexes were reported, which are new 14-electron Pd(0)-complexes that serve as key synthons for known palladium(0) and palladium(II) species and allow access to unprecedented mixed NHC-phosphite palladium(0) complexes. These complexes are also capable of catalyzing the facile hydrosilylation of allenes. DFT calculations provided insights into the relatively weak interaction between the metal and the diphenylacetylene ligand, comparing it with other ligands with varying coordinating power, structure, and electronic properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Organic
Shiyi Yang, Xiang Yu, Albert Poater, Luigi Cavallo, Catherine S. J. Cazin, Steven P. Nolan, Michal Szostak
Summary: In this study, the excellent activity of [Pd(NHC)(μ-Cl)Cl]2 pre-catalysts in both the Buchwald-Hartwig amination and C-S/S-H metathesis reactions was demonstrated. The unified mechanism for the activation of C-S bonds in these reactions, where the inert C-S bond serves as a precursor to valuable products, was also elucidated.
Article
Chemistry, Multidisciplinary
Francis Bru, Sofie M. P. Vanden Broeck, Gianmarco Pisano, Klaartje De Buysser, Catherine S. J. Cazin
Summary: This article describes the implementation of a laboratory exercise in an undergraduate chemistry course where students compare three different synthetic methods for [Cu(Cl)(IPr)]-complexes. The exercise introduces students to the concepts of continuous improvement in reactions using green chemistry and mechanochemistry as a synthetic methodology. By directly comparing the three methods, students learn about green chemistry metrics and are challenged to question the use of solvents in chemical syntheses.
JOURNAL OF CHEMICAL EDUCATION
(2023)
Article
Chemistry, Physical
David C. Cabanero, Jennifer A. Nguyen, Catherine S. J. Cazin, Steven P. Nolan, Tomislav Rovis
Summary: A system has been developed that uses deep red to near-infrared light to activate a latent ruthenium olefin metathesis catalyst. This is achieved by using an osmium(II) photocatalyst that is excited to its triplet state and a latent solvent-coordinated, cationic precatalyst that undergoes excited-state single-electron reduction. The system demonstrates excellent spatiotemporal control under light irradiation and shows improved light penetration through barriers.
Article
Chemistry, Organic
Shiyi Yang, Xiang Yu, Yaxu Liu, Michele Tomasini, Lucia Caporaso, Albert Poater, Luigi Cavallo, Catherine S. J. Cazin, Steven P. Nolan, Michal Szostak
Summary: The Suzuki-Miyaura cross-coupling reaction enables the construction of biaryl ketones from inert amide bonds. However, the mechanism of C(acyl)-N bond oxidative addition and catalyst effect in this reaction remain poorly understood. This study investigates the use of [Pd(NHC)(sulfide)Cl-2] catalysts for amide N-C bond activation and presents the reaction development, kinetic studies, and reaction scope. DFT studies were also conducted to gain insight into the mechanism of C(acyl)-N bond oxidative addition and catalyst activation. The results suggest that [Pd(NHC)(sulfide)Cl-2] precatalysts could find application in C(acyl)-X bond activation in organic synthesis and catalysis.
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Thomas Scattolin, Aleksei A. Logvinov, Nikolaos V. Tzouras, Catherine S. J. Cazin, Steven P. Nolan
Summary: N-heterocyclic carbene (NHC) ligands have evolved from being lab curiosities to important supporting ligands in various fields such as organometallic chemistry, homogeneous catalysis, medicinal chemistry, and materials science.
Article
Chemistry, Multidisciplinary
Sylwia Ostrowska, Pierre Arnaut, David J. Liptrot, Catherine S. J. Cazin, Steven P. Nolan
Summary: The synthesis, isolation, and full characterization of a new copper complex [Cu(IPr)(OC(H)(CF3)(2))] (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) are reported. This copper(I) complex is a versatile synthon capable of activating various X-H bonds including C-H, N-H, and S-H bonds. [Cu(IPr)(OC(H)(CF3)(2))] was investigated as a pre-catalyst in several catalytic reactions.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Vladislav A. Voloshkin, Yaxu Liu, Marek Belis, Min Peng, Kristof Van Hecke, Catherine S. J. Cazin, Steven P. Nolan
Summary: The synthesis of novel phosphine palladium PEPPSI and dimer complexes bearing RuPhos, SPhos and XPhos phosphines is reported. The crystal structures of XPhos Pd PEPPSI with pyridine, SPhos Pd PEPPSI with 3-chloropyridine as throw-away ligands and the RuPhos palladium dimer were obtained and compared with previously reported congeners. The catalytic activity of these complexes was examined via a C-N coupling reaction, and it was found that RuPhos complex 2b showed the highest catalytic activity with 97% yield at a low catalyst loading. The addition of 3-pentanone significantly improved the yields of phosphine dimers and PEPPSI complexes when the reactions were performed in THF.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Multidisciplinary
Benon Maliszewski, Eleonora Casillo, Perrine Lambert, Fady Nahra, Catherine Cazin, Steven Nolan
Summary: This article reports an efficient olefin hydrosilylation protocol using Pt(ii)-thioether-based pre-catalysts. These simple and readily available complexes exhibit excellent catalytic performance and offer significant advantages over existing alternatives, enabling rapid and high conversions at ppm-level catalyst loadings.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ishfaq Ibni Hashim, Nikolaos Tzouras, Xinyuan Ma, Laurens Bourda, Kristof Van Hecke, Steven P. Nolan, Catherine S. J. Cazin
Summary: In this study, a simple and scalable method for synthesizing widely used NHC-metal-diketonate complexes was reported. The complexes were synthesized for the first time under mild, aerobic conditions and in excellent yields. Characterization of the complexes revealed a bidentate binding mode of the diketonate ligand to copper and a C-bound binding mode to gold. Furthermore, the gold complex showed high efficiency as a pre-catalyst for the hydrocarboxylation of alkynes.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Ekaterina A. Martynova, Vladislav A. Voloshkin, Sebastien G. Guillet, Francis Bru, Marek Belis, Kristof Van Hecke, Catherine S. J. Cazin, Steven P. Nolan
Summary: This study presents the use of gold sensitizers [Au(SIPr)(Cbz)] and [Au(IPr)(Cbz)] in [2 + 2] cycloadditions, which offer higher triplet energy values compared to iridium-based systems. These gold complexes enable the reaction of previously inaccessible substrates and achieve fast and environmentally friendly reactions.
Article
Chemistry, Inorganic & Nuclear
Benon P. Maliszewski, Ida Ritacco, Marek Belis, Ishfaq Ibni Hashim, Nikolaos Tzouras, Lucia Caporaso, Luigi Cavallo, Kristof Van Hecke, Fady Nahra, Catherine S. J. Cazin, Steven P. Nolan
Summary: A sustainable and facile method for synthesizing platinum N-heterocyclic carbene (NHC) complexes is disclosed in this study, and the mechanism of the reaction is elucidated through experimental and computational investigations. The protocol is further utilized to synthesize novel Pt(ii)-NHC complexes and explore its utility in accessing important Pt(0)-NHC precatalysts.
DALTON TRANSACTIONS
(2022)
