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Journal articles on the topic 'Transition metals; Catalytic systems'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Filardo, Giuseppe, Alessandro Galia, Franco Rivetti, Onofrio Scialdone, and Giuseppe Silvestri. "Catalytic systems based on transition metals for the carbonylation of methanol to dimethylcarbonate." Electrochimica Acta 42, no. 13-14 (1997): 1961–65. http://dx.doi.org/10.1016/s0013-4686(97)85467-9.

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2

Pal, Pratibha, Jyh-Ming Ting, Shivani Agarwal, Takayuki Ichikawa, and Ankur Jain. "The Catalytic Role of D-block Elements and Their Compounds for Improving Sorption Kinetics of Hydride Materials: A Review." Reactions 2, no. 3 (2021): 333–64. http://dx.doi.org/10.3390/reactions2030022.

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The goal of finding efficient and safe hydrogen storage material motivated researchers to develop several materials to fulfil the demand of the U.S. Department of Energy (DOE). In the past few years, several metal hydrides, complex hydrides such as borohydrides and alanates, have been researched and found efficient due to their high gravimetric and volumetric density. However, the development of these materials is still limited by their high thermodynamic stability and sluggish kinetics. One of the methods to improve the kinetics is to use catalysts. Among the known catalysts for this purpose,

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3

Strekalova, Sofia, Mikhail Khrizanforov, and Yulia Budnikova. "Evaluation of Transition Metal Catalysts in Electrochemically Induced Aromatic Phosphonation." Molecules 24, no. 9 (2019): 1823. http://dx.doi.org/10.3390/molecules24091823.

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Voltammetry provides important information on the redox properties of catalysts (transition metal complexes of Ni, Co, Mn, etc.) and their activity in electrocatalytic reactions of aromatic C–H phosphonation in the presence of a phosphorus precursor, for example, dialkyl-H-phosphonate. Based on catalytic current growth of oxidation or reduction of the metal catalysts (CoII, MnII, NiII, MnII/NiII, MnII/CoII, and CoII/NiII), quantitative characteristics of the regeneration of catalysts were determined, for example, for MnII, NiII and MnII/NiII, CoII/NiII pairs. Calculations confirmed the previou

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4

Nesterov, Dmytro, and Oksana Nesterova. "Polynuclear Cobalt Complexes as Catalysts for Light-Driven Water Oxidation: A Review of Recent Advances." Catalysts 8, no. 12 (2018): 602. http://dx.doi.org/10.3390/catal8120602.

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Photochemical water oxidation, as a half-reaction of water splitting, represents a great challenge towards the construction of artificial photosynthetic systems. Complexes of first-row transition metals have attracted great attention in the last decade due to their pronounced catalytic efficiency in water oxidation, comparable to that exhibited by classical platinum-group metal complexes. Cobalt, being an abundant and relatively cheap metal, has rich coordination chemistry allowing construction of a wide range of polynuclear architectures for the catalytic purposes. This review covers recent a

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5

Hirao, Toshikazu, and Toru Amaya. "Synthesis and Application of Redox-Active Hybrid Catalytic Systems Consisting of Polyanilines and Transition Metals." Synlett 2011, no. 04 (2011): 435–48. http://dx.doi.org/10.1055/s-0030-1259541.

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6

Chen, Xiao, and Changhai Liang. "Transition metal silicides: fundamentals, preparation and catalytic applications." Catalysis Science & Technology 9, no. 18 (2019): 4785–820. http://dx.doi.org/10.1039/c9cy00533a.

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Transition metal silicides as low-cost and earth-abundant inorganic materials are becoming indispensable constituents in catalytic systems for a variety of applications and exhibit excellent properties for sustainable industrial process.

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7

Khalimon, Andrey, Kristina Gudun, and Davit Hayrapetyan. "Base Metal Catalysts for Deoxygenative Reduction of Amides to Amines." Catalysts 9, no. 6 (2019): 490. http://dx.doi.org/10.3390/catal9060490.

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The development of efficient methodologies for production of amines attracts significant attention from synthetic chemists, because amines serve as essential building blocks in the synthesis of many pharmaceuticals, natural products, and agrochemicals. In this regard, deoxygenative reduction of amides to amines by means of transition-metal-catalyzed hydrogenation, hydrosilylation, and hydroboration reactions represents an attractive alternative to conventional wasteful techniques based on stoichiometric reductions of the corresponding amides and imines, and reductive amination of aldehydes wit

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8

L. Simakova, Irina, Andrey V. Simakov, and Dmitry Yu. Murzin. "Valorization of Biomass Derived Terpene Compounds by Catalytic Amination." Catalysts 8, no. 9 (2018): 365. http://dx.doi.org/10.3390/catal8090365.

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This review fills an apparent gap existing in the literature by providing an overview of the readily available terpenes and existing catalytic protocols for preparation of terpene-derived amines. To address the role of solid catalysts in amination of terpenes the same reactions with homogeneous counterparts are also discussed. Such catalysts can be considered as a benchmark, which solid catalysts should match. Although catalytic systems based on transition metal complexes have been developed for synthesis of amines to a larger extent, there is an apparent need to reduce the production costs. S

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9

Zhou, Wei, Lei Zhong, and Wei Dong Li. "Progress in Development of Catalyst Systems for Coordinated Polymerization of Olefins." Advanced Materials Research 900 (February 2014): 11–14. http://dx.doi.org/10.4028/www.scientific.net/amr.900.11.

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The research progresses about polyolefin catalyst systems in recent years are summarized. Focusing on the type and properties of the catalytic polymerization of the olefin polymerization catalyst, including typical Ziegler-Natta catalysts, metallocene catalysts and post-transition metal catalyst system. Then the new post-transition metal catalyst is introduced.

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10

Jang, Jisun, Sangmoon Byun, B. Moon Kim, and Sunwoo Lee. "Arylsilylation of aryl halides using the magnetically recyclable bimetallic Pd–Pt–Fe3O4 catalyst." Chemical Communications 54, no. 28 (2018): 3492–95. http://dx.doi.org/10.1039/c7cc09926f.

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11

Amaya, Toru, and Toshikazu Hirao. "ChemInform Abstract: Synthesis and Application of Redox-Active Hybrid Catalytic Systems Consisting of Polyanilines and Transition Metals." ChemInform 42, no. 27 (2011): no. http://dx.doi.org/10.1002/chin.201127242.

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12

Nesterov, Dmytro S., and Oksana V. Nesterova. "Catalytic Oxidations with Meta-Chloroperoxybenzoic Acid (m-CPBA) and Mono- and Polynuclear Complexes of Nickel: A Mechanistic Outlook." Catalysts 11, no. 10 (2021): 1148. http://dx.doi.org/10.3390/catal11101148.

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Selective catalytic functionalization of organic substrates using peroxides as terminal oxidants remains a challenge in modern chemistry. The high complexity of interactions between metal catalysts and organic peroxide compounds complicates the targeted construction of efficient catalytic systems. Among the members of the peroxide family, m-chloroperoxybenzoic acid (m-CPBA) exhibits quite complex behavior, where numerous reactive species could be formed upon reaction with a metal complex catalyst. Although m-CPBA finds plenty of applications in fine organic synthesis and catalysis, the factors

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13

Jung, Jieun, and Susumu Saito. "Recent Advances in Light-Driven Carbon–Carbon Bond Formation via Carbon Dioxide Activation." Synthesis 53, no. 18 (2021): 3263–78. http://dx.doi.org/10.1055/a-1577-5947.

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AbstractCarbon dioxide (CO2) is an attractive renewable one-carbon (C1) feedstock in terms of its earth abundance, low cost, and non-toxicity. Developing new catalytic systems to realize the practical insertion of CO2 into organic molecules has been of great importance for ecological economics. In recent years, outstanding improvements have been carried out in the field of light-driven catalytic carboxylation via the activation of CO2 as the key reagent. In this short review, the recent developments of light-promoted carboxylation utilizing CO2 to synthesize value-added chemicals using a dual

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14

Suprun, W. Ya, R. B. Sheparovych, Yu M. Hrynda, O. Yu Khavunko, and I. A. Opeida. "Supported transition metals oxides and N-hydroxyphthalimide as binary catalytic systems for the liquid-phase oxidation of cumene." Molecular Catalysis 510 (June 2021): 111683. http://dx.doi.org/10.1016/j.mcat.2021.111683.

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15

Lunardon, Marco, JiaJia Ran, Dario Mosconi, et al. "Hybrid Transition Metal Dichalcogenide/Graphene Microspheres for Hydrogen Evolution Reaction." Nanomaterials 10, no. 12 (2020): 2376. http://dx.doi.org/10.3390/nano10122376.

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A peculiar 3D graphene-based architecture, i.e., partial reduced-Graphene Oxide Aerogel Microspheres (prGOAM), having a dandelion-like morphology with divergent microchannels to implement innovative electrocatalysts for the hydrogen evolution reaction (HER) is investigated in this paper. prGOAM was used as a scaffold to incorporate exfoliated transition metals dichalcogenide (TMDC) nanosheets, and the final hybrid materials have been tested for HER and photo-enhanced HER. The aim was to create a hybrid material where electronic contacts among the two pristine materials are established in a 3D

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16

Genoni, Andrea, Giuseppina La Ganga, Andrea Volpe, et al. "Water oxidation catalysis upon evolution of molecular Co(iii) cubanes in aqueous media." Faraday Discussions 185 (2015): 121–41. http://dx.doi.org/10.1039/c5fd00076a.

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The increasing global energy demand has stimulated great recent efforts in investigating new solutions for artificial photosynthesis, a potential source of clean and renewable solar fuel. In particular, according to the generally accepted modular approach aimed at optimising separately the different compartments of the entire process, many studies have focused on the development of catalytic systems for water oxidation to oxygen. While in recent years there have been many reports on new catalytic systems, the mechanism and the active intermediates operating the catalysis have been less investi

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17

Mai, Shaoyu, Changqing Rao, Ming Chen, Jihu Su, Jiangfeng Du, and Qiuling Song. "Merging gold catalysis, organocatalytic oxidation, and Lewis acid catalysis for chemodivergent synthesis of functionalized oxazoles from N-propargylamides." Chemical Communications 53, no. 75 (2017): 10366–69. http://dx.doi.org/10.1039/c7cc05746f.

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Novel catalytic systems consisting of cationic gold complexes, N-hydroxyphthalimide (NHPI), and transition-metal-based Lewis acids have been developed for the one-pot synthesis of functionalized oxazoles.

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18

Chernikova, O. M., H. D. Mateik, and Y. V. Ogorodnik. "Influence atoms of Co, Ni, Cu on the catalytic activity of small Pt clasters: First principles calculations." Physics and Chemistry of Solid State 21, no. 3 (2020): 415–19. http://dx.doi.org/10.15330/pcss.21.3.415-419.

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Based on the calculations from the first principles, we obtained the distributions of valence electron densities and electronic energy spectra for small Ptn clusters (where n = 1-5 atoms). According to the results of calculations, it is determined that the inclusion of oxygen atoms or atoms of other kinds in small Ptn clusters, as a rule, affect the catalytic activity of research systems. It is established that during doping of small platinum clusters by atoms of 3-d transition metals (Cu, Ni, Co), the electronic structure of the cluster and the band gap change. This in turn helps to increase

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19

Lykaki, Maria, Sofia Stefa, Sόnia Carabineiro, Pavlos Pandis, Vassilis Stathopoulos, and Michalis Konsolakis. "Facet-Dependent Reactivity of Fe2O3/CeO2 Nanocomposites: Effect of Ceria Morphology on CO Oxidation." Catalysts 9, no. 4 (2019): 371. http://dx.doi.org/10.3390/catal9040371.

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Ceria has been widely studied either as catalyst itself or support of various active phases in many catalytic reactions, due to its unique redox and surface properties in conjunction to its lower cost, compared to noble metal-based catalytic systems. The rational design of catalytic materials, through appropriate tailoring of the particles’ shape and size, in order to acquire highly efficient nanocatalysts, is of major significance. Iron is considered to be one of the cheapest transition metals while its interaction with ceria support and their shape-dependent catalytic activity has not been f

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20

Mayet, Nolwenn, Karine Servat, K. Boniface Kokoh, and Teko W. Napporn. "Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals." Surfaces 2, no. 2 (2019): 257–76. http://dx.doi.org/10.3390/surfaces2020020.

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The advances in material science have led to the development of novel and various materials as nanoparticles or thin films. Underpotential deposition (upd) of transition metals appears to be a very sensitive method for probing the surfaces of noble metals, which is a parameter that has an important effect on the activity in heterogeneous catalysis. Underpotential deposition as a surface characterization tool permits researchers to precisely determine the crystallographic orientations of nanoparticles or the real surface area of various surfaces. Among all the work dealing with upd, this review

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21

Lee, Ha-Eun, Dopil Kim, Ahrom You, Myung Hwan Park, Min Kim та Cheoljae Kim. "Transition Metal-Catalyzed α-Position Carbon–Carbon Bond Formations of Carbonyl Derivatives". Catalysts 10, № 8 (2020): 861. http://dx.doi.org/10.3390/catal10080861.

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α-Functionalization of carbonyl compounds in organic synthesis has traditionally been accomplished via classical enolate chemistry. As α-functionalized carbonyl moieties are ubiquitous in biologically and pharmaceutically valuable molecules, catalytic α-alkylations have been extensively studied, yielding a plethora of practical and efficient methodologies. Moreover, stereoselective carbon–carbon bond formation at the α-position of achiral carbonyl compounds has been achieved by using various transition metal–chiral ligand complexes. This review describes recent advances—in the last 20 years an

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22

Kuriakose, Nishamol, and Kumar Vanka. "Can main group systems act as superior catalysts for dihydrogen generation reactions? A computational investigation." Dalton Transactions 45, no. 14 (2016): 5968–77. http://dx.doi.org/10.1039/c5dt01058f.

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The density functional theory (DFT) calculations reveal the potential of newly proposed main group germanium hydride systems to effect important chemical transformations, such as the catalytic cleavage of the O–H bond in water and alcohols, with significantly greater efficiency than the existing, state-of-the-art post-transition metal based systems.

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23

Palella, Alessandra, Katia Barbera, Francesco Arena, and Lorenzo Spadaro. "Clean Syn-Fuels via Hydrogenation Processes: Acidity–Activity Relationship in O-Xylene Hydrotreating." ChemEngineering 4, no. 1 (2020): 4. http://dx.doi.org/10.3390/chemengineering4010004.

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Transition metal sulfide catalysts are actually the most performing catalytic materials in crude oil hydrotreating (HDT), for energetic purposes. However, these systems suffer from several drawbacks that limit their exploitation. Aiming to meet the even more stringent environmental requirement, through a remarkable improvement of HDT performance in the presence of refractory feedstock (i.e., in terms of activity, selectivity, and stability), a deeper knowledge of the structure–activity relationship of catalysts must be achieved. Therefore, in this study, CoMo/γ-Al2O3 and NiMo/γ-Al2O3 catalysts

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24

Heindl, Jason E., Michael E. Hibbing, Jing Xu, Ramya Natarajan, Aaron M. Buechlein, and Clay Fuqua. "Discrete Responses to Limitation for Iron and Manganese in Agrobacterium tumefaciens: Influence on Attachment and Biofilm Formation." Journal of Bacteriology 198, no. 5 (2015): 816–29. http://dx.doi.org/10.1128/jb.00668-15.

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ABSTRACTTransition metals such as iron and manganese are crucial trace nutrients for the growth of most bacteria, functioning as catalytic cofactors for many essential enzymes. Dedicated uptake and regulatory systems have evolved to ensure their acquisition for growth, while preventing toxicity. Transcriptomic analysis of the iron- and manganese-responsive regulons ofAgrobacterium tumefaciensrevealed that there are discrete regulatory networks that respond to changes in iron and manganese levels. Complementing earlier studies, the iron-responsive gene network is quite large and includes many a

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25

Gulyás, Henrik, Ivan Rivilla, Simona Curreli, Zoraida Freixa, and Piet W. N. M. van Leeuwen. "Highly active, chemo- and enantioselective Pt-SPO catalytic systems for the synthesis of aromatic carboxamides." Catalysis Science & Technology 5, no. 7 (2015): 3822–28. http://dx.doi.org/10.1039/c5cy00627a.

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Platinum complexes of the chiral non-racemizing SPO ligand 1 have been discovered to be the first artificial transition metal complexes providing kinetic resolution in the hydration of a racemic chiral nitrile.

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26

Mysore Ramesha, Bharadwaj, and Vera Meynen. "Advances and Challenges in the Creation of Porous Metal Phosphonates." Materials 13, no. 23 (2020): 5366. http://dx.doi.org/10.3390/ma13235366.

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In the expansive world of porous hybrid materials, a category of materials that has been rather less explored than others and is gaining attention in development is the porous metal phosphonates. They offer promising features towards applications which demand control over the inorganic–organic network and interface, which is critical for adsorption, catalysis and functional devices and technology. The need to establish a rationale for new synthesis approaches to make these materials in a controlled manner is by itself an important motivation for material chemists. In this review, we highlight

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27

BILA, Evgenia, Daryna SOLTYS, and Mykola OBUSHAK. "THREE-COMPONENT REACTIONS OF UNSATURATED COMPOUNDS WITH ARENEDIASONIUM SALTS AND NEUTRAL NUCLEOPHILS. ARYLSULFONYLATION." Proceedings of the Shevchenko Scientific Society. Series Сhemical Sciences 2020, no. 60 (2020): 31–54. http://dx.doi.org/10.37827/ntsh.chem.2020.60.031.

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The results of recent achievements on the interaction of arenediazonium salts with unsaturated compounds in the presence of neutral nucleophiles are summarized. New examples of multicomponent transformations with the participation of such neutral nucleophiles as CO (arylcarbonylation), NO (arylnitrosylation), aceto¬nitrile (aminoarylation), SO2 (arylsulfonylation) and others are given. These reactions can be applied to alkenes, alkynes, aromatic compounds. Mild reaction conditions allow the use of reagents with different functional groups. Reactions of this type open up the possibility of one-

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28

Suarez, Hugo, Adrian Ramirez, Carlos J. Bueno-Alejo, and Jose L. Hueso. "Silver-Copper Oxide Heteronanostructures for the Plasmonic-Enhanced Photocatalytic Oxidation of N-Hexane in the Visible-NIR Range." Materials 12, no. 23 (2019): 3858. http://dx.doi.org/10.3390/ma12233858.

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Volatile organic compounds (VOCs) are recognized as hazardous contributors to air pollution, precursors of multiple secondary byproducts, troposphere aerosols, and recognized contributors to respiratory and cancer-related issues in highly populated areas. Moreover, VOCs present in indoor environments represent a challenging issue that need to be addressed due to its increasing presence in nowadays society. Catalytic oxidation by noble metals represents the most effective but costly solution. The use of photocatalytic oxidation has become one of the most explored alternatives given the green an

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29

Vemula, Sandeep R., Michael R. Chhoun, and Gregory R. Cook. "Well-Defined Pre-Catalysts in Amide and Ester Bond Activation." Molecules 24, no. 2 (2019): 215. http://dx.doi.org/10.3390/molecules24020215.

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Over the past few decades, transition metal catalysis has witnessed a rapid and extensive development. The discovery and development of cross-coupling reactions is considered to be one of the most important advancements in the field of organic synthesis. The design and synthesis of well-defined and bench-stable transition metal pre-catalysts provide a significant improvement over the current catalytic systems in cross-coupling reactions, avoiding excess use of expensive ligands and harsh conditions for the synthesis of pharmaceuticals, agrochemicals and materials. Among various well-defined pr

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30

Zhang, Zhuolei, Ji Su, Ana Sanz Matias, et al. "Enhanced and stabilized hydrogen production from methanol by ultrasmall Ni nanoclusters immobilized on defect-rich h-BN nanosheets." Proceedings of the National Academy of Sciences 117, no. 47 (2020): 29442–52. http://dx.doi.org/10.1073/pnas.2015897117.

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Employing liquid organic hydrogen carriers (LOHCs) to transport hydrogen to where it can be utilized relies on methods of efficient chemical dehydrogenation to access this fuel. Therefore, developing effective strategies to optimize the catalytic performance of cheap transition metal-based catalysts in terms of activity and stability for dehydrogenation of LOHCs is a critical challenge. Here, we report the design and synthesis of ultrasmall nickel nanoclusters (∼1.5 nm) deposited on defect-rich boron nitride (BN) nanosheet (Ni/BN) catalysts with higher methanol dehydrogenation activity and sel

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31

Buncel, Erwin, Ruby Nagelkerke, and Gregory RJ Thatcher. "Alkali metal ion catalysis in nucleophilic displacement by ethoxide ion on p-nitrophenyl phenylphosphonate: Evidence for multiple metal ion catalysis." Canadian Journal of Chemistry 81, no. 1 (2003): 53–63. http://dx.doi.org/10.1139/v02-202.

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In continuation of our studies of alkali metal ion catalysis and inhibition at carbon, phosphorus, and sulfur centers, the role of alkali metal ions in nucleophilic displacement reactions of p-nitrophenyl phenylphosphonate (PNPP) has been examined. All alkali metal ions studied acted as catalysts. Alkali metal ions added as inert salts increased the rate while decreased rate resulted on M+ complexation with 18-crown-6 ether. Kinetic analysis indicated the interaction of possibly three potassium ions, four sodium ions, and five lithium ions in the transition state of the reactions of ethoxide w

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32

Chen, Chueh-An, Chiao-Lin Lee, Po-Kang Yang, Dung-Sheng Tsai, and Chuan-Pei Lee. "Active Site Engineering on Two-Dimensional-Layered Transition Metal Dichalcogenides for Electrochemical Energy Applications: A Mini-Review." Catalysts 11, no. 2 (2021): 151. http://dx.doi.org/10.3390/catal11020151.

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Two-dimensional-layered transition metal dichalcogenides (2D-layered TMDs) are a chemically diverse class of compounds having variable band gaps and remarkable electrochemical properties, which make them potential materials for applications in the field of electrochemical energy. To date, 2D-layered TMDs have been wildly used in water-splitting systems, dye-sensitized solar cells, supercapacitors, and some catalysis systems, etc., and the pertinent devices exhibit good performances. However, several reports have also indicated that the active sites for catalytic reaction are mainly located on

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33

Nghiem, Tai-Lam, Deniz Coban, Stefanie Tjaberings, and André H. Gröschel. "Recent Advances in the Synthesis and Application of Polymer Compartments for Catalysis." Polymers 12, no. 10 (2020): 2190. http://dx.doi.org/10.3390/polym12102190.

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Catalysis is one of the most important processes in nature, science, and technology, that enables the energy efficient synthesis of essential organic compounds, pharmaceutically active substances, and molecular energy sources. In nature, catalytic reactions typically occur in aqueous environments involving multiple catalytic sites. To prevent the deactivation of catalysts in water or avoid unwanted cross-reactions, catalysts are often site-isolated in nanopockets or separately stored in compartments. These concepts have inspired the design of a range of synthetic nanoreactors that allow otherw

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34

Tao, Lei, Yu-Yang Zhang, Sokrates T. Pantelides, and Shixuan Du. "Tuning the Catalytic Activity of a Quantum Nutcracker for Hydrogen Dissociation." Surfaces 3, no. 1 (2020): 40–47. http://dx.doi.org/10.3390/surfaces3010004.

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A quantum nutcracker, a recently proposed catalytic system for hydrogen dissociation, consists of two inert components: an organic molecule such as a transition metal phthalocyanine and an inert surface such as Cu or Au. The reaction takes place at the interface between the two components, which are weakly bonded by Van der Waals (VdW) forces. Here, we explore a method used to tune the reaction barrier in a quantum nutcracker system for hydrogen dissociation. By employing density-functional-theory calculations, we find that the H2 entry barrier, which is the rate-limiting barrier, is reduced b

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35

Zheng, Yun, Xiaojuan Wan, Xin Cheng, Kun Cheng, Zhengfei Dai, and Zhihong Liu. "Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells." Catalysts 10, no. 2 (2020): 166. http://dx.doi.org/10.3390/catal10020166.

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Direct ethanol fuel cells (DEFCs) have emerged as promising and advanced power systems that can considerably reduce fossil fuel dependence, and thus have attracted worldwide attention. DEFCs have many apparent merits over the analogous devices fed with hydrogen or methanol. As the key constituents, the catalysts for both cathodes and anodes usually face some problems (such as high cost, low conversion efficiency, and inferior durability) that hinder the commercialization of DEFCs. This review mainly focuses on the most recent advances in nanostructured catalysts for anode materials in DEFCS. F

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36

Sánchez-López, Perla, Yulia Kotolevich, Serguei Miridonov, Fernando Chávez-Rivas, Sergio Fuentes, and Vitalii Petranovskii. "Bimetallic AgFe Systems on Mordenite: Effect of Cation Deposition Order in the NO Reduction with C3H6/CO." Catalysts 9, no. 1 (2019): 58. http://dx.doi.org/10.3390/catal9010058.

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Mono- and bimetallic systems of Ag, Fe, and Ag–Fe exchanged in sodium mordenite zeolite were studied in the reaction of NO reduction. The transition metal cations Ag and Fe were introduced by ion exchange method both at room temperature and 60 °C; modifying the order of component deposition in bimetallic systems. These materials were characterized by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES), ultraviolet-visible spectroscopy (UV-Vis), X-Ray photoelectron Spectroscopy (XPS) and High-resolution transmission electron microscopy (HR-TEM). The XPS and UV–Vis spectra of bime

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37

Liang, G., J. Huot, S. Boily, A. Van Neste, and R. Schulz. "Catalytic effect of transition metals on hydrogen sorption in nanocrystalline ball milled MgH2–Tm (Tm=Ti, V, Mn, Fe and Ni) systems." Journal of Alloys and Compounds 292, no. 1-2 (1999): 247–52. http://dx.doi.org/10.1016/s0925-8388(99)00442-9.

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38

Manos, Donatos, Kleopatra Miserli, and Ioannis Konstantinou. "Perovskite and Spinel Catalysts for Sulfate Radical-Based Advanced Oxidation of Organic Pollutants in Water and Wastewater Systems." Catalysts 10, no. 11 (2020): 1299. http://dx.doi.org/10.3390/catal10111299.

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Since environmental pollution by emerging organic contaminants is one of the most important problems, gaining ground year after year, the development of decontamination technologies of water systems is now imperative. Advanced oxidation processes (AOPs) with the formation of highly reactive radicals can provide attractive technologies for the degradation of organic pollutants in water systems. Among several AOPs that can be applied for the formation of active radicals, this review study focus on sulfate radical based-AOPs (SR-AOPs) through the heterogeneous catalytic activation of persulfate (

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39

Ahmad, Dalla Tiezza, and Orian. "In Silico Acetylene [2+2+2] Cycloadditions Catalyzed by Rh/Cr Indenyl Fragments." Catalysts 9, no. 8 (2019): 679. http://dx.doi.org/10.3390/catal9080679.

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Metal-catalyzed alkyne [2+2+2] cycloadditions provide a variety of substantial aromatic compounds of interest in the chemical and pharmaceutical industries. Herein, the mechanistic aspects of the acetylene [2+2+2] cycloaddition mediated by bimetallic half-sandwich catalysts [Cr(CO)3IndRh] (Ind = (C9H7)−, indenyl anion) are investigated. A detailed exploration of the potential energy surfaces (PESs) was carried out to identify the intermediates and transition states, using a relativistic density functional theory (DFT) approach. For comparison, monometallic parent systems, i.e., CpRh (Cp = (C5H

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van Dijk, Alberdina A., Eugene V. Makeyev, and Dennis H. Bamford. "Initiation of viral RNA-dependent RNA polymerization." Journal of General Virology 85, no. 5 (2004): 1077–93. http://dx.doi.org/10.1099/vir.0.19731-0.

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This review summarizes the combined insights from recent structural and functional studies of viral RNA-dependent RNA polymerases (RdRPs) with the primary focus on the mechanisms of initiation of RNA synthesis. Replication of RNA viruses has traditionally been approached using a combination of biochemical and genetic methods. Recently, high-resolution structures of six viral RdRPs have been determined. For three RdRPs, enzyme complexes with metal ions, single-stranded RNA and/or nucleoside triphosphates have also been solved. These advances have expanded our understanding of the molecular mech

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Banerjee, Abhinandan, and Robert W. J. Scott. "Optimization of transition metal nanoparticle-phosphonium ionic liquid composite catalytic systems for deep hydrogenation and hydrodeoxygenation reactions." Green Chemistry 17, no. 3 (2015): 1597–604. http://dx.doi.org/10.1039/c4gc01716a.

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Rydel-Ciszek, Katarzyna, Tomasz Pacześniak, Izabela Zaborniak, et al. "Iron-Based Catalytically Active Complexes in Preparation of Functional Materials." Processes 8, no. 12 (2020): 1683. http://dx.doi.org/10.3390/pr8121683.

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Iron complexes are particularly interesting as catalyst systems over the other transition metals (including noble metals) due to iron’s high natural abundance and mediation in important biological processes, therefore making them non-toxic, cost-effective, and biocompatible. Both homogeneous and heterogeneous catalysis mediated by iron as a transition metal have found applications in many industries, including oxidation, C-C bond formation, hydrocarboxylation and dehydration, hydrogenation and reduction reactions of low molecular weight molecules. These processes provided substrates for indust

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Piola, Lorenzo, Fady Nahra, and Steven P. Nolan. "Olefin metathesis in air." Beilstein Journal of Organic Chemistry 11 (October 30, 2015): 2038–56. http://dx.doi.org/10.3762/bjoc.11.221.

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Since the discovery and now widespread use of olefin metathesis, the evolution of metathesis catalysts towards air stability has become an area of significant interest. In this fascinating area of study, beginning with early systems making use of high oxidation state early transition metal centers that required strict exclusion of water and air, advances have been made to render catalysts more stable and yet more functional group tolerant. This review summarizes the major developments concerning catalytic systems directed towards water and air tolerance.

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Zhu, Lei, Haojie Yu, Li Wang, Yusheng Xing, and Bilal Ul Amin. "Advances in the Synthesis of Polyolefin Elastomers with “Chain-walking” Catalysts and Electron Spin Resonance Research of Related Catalytic Systems." Current Organic Chemistry 25, no. 8 (2021): 935–49. http://dx.doi.org/10.2174/1385272825666210126100641.

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In recent years, polyolefin elastomers play an increasingly important role in industry. The late transition metal complex catalysts, especially α-diimine Ni(II) and α-diimine Pd(II) complex catalysts, are popular “chain-walking” catalysts. They can prepare polyolefin with various structures, ranging from linear configuration to highly branched configuration. Combining the “chain-walking” characteristic with different polymerization strategies, polyolefins with good elasticity can be obtained. Among them, olefin copolymer is a common way to produce polyolefin elastomers. For instance, strictly

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Peckh, Kamil, and Beata Orlińska. "Transition Metal Salts of Carboxylated Multiwalled Carbon Nanotubes in Combination with N-hydroxyphthalimide as Catalytic Systems for Hydrocarbon Oxidation." Materials 14, no. 9 (2021): 2314. http://dx.doi.org/10.3390/ma14092314.

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In this study, the transition metal (Co (II), Cu (II), and Mn (II)) salts of carboxylated carbon nanotubes were synthesized and characterized (the determined metal contents were in the range of 0.89–1.16%). The catalytic activity and the possibility for recovery and reuse of the obtained heterogeneous salts were then studied in the solvent-free oxidation of ethylbenzene with oxygen. The oxidation processes were carried out at 80 °C under atmospheric pressure in the presence of N-hydroxyphthalimide. The highest conversion of ethylbenzene, 27%, was obtained with a system consisting of the Cu (II

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Grafova, Iryna A., Andrei V. Grafov, Umberto Costantino, Fabio Marmottini, and Marcos L. Dias. "Layered Double Hydroxides as Supports for Norbornene Addition Polymerisation Catalysts." Zeitschrift für Naturforschung B 58, no. 11 (2003): 1069–74. http://dx.doi.org/10.1515/znb-2003-1106.

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Abstract Addition polymerisation of norbornene with transition metal catalysts activated by methylaluminoxane was first realised on heterogeneous catalytic systems. Advanced inorganic functional polymers possessing anion-exchange properties - layered double hydroxides of Al and Zn of hydrotalcitetype - were applied as supports. They possess high polarity and are selective towards polar molecules like organometallic compounds. The activity of immobilised nickel catalysts was found to be higher than that of the homogeneous one. A certain catalytic activity was also found for group 4 phthalocyani

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Leimkühler, Silke. "Transition Metals in Catalysis: The Functional Relationship of Fe–S Clusters and Molybdenum or Tungsten Cofactor-Containing Enzyme Systems." Inorganics 9, no. 1 (2021): 6. http://dx.doi.org/10.3390/inorganics9010006.

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Following the “Molybdenum and Tungsten Enzyme conference—MoTEC2019” and the satellite meeting on “Iron–Sulfur for Life”, we wanted to emphasize the link between iron–sulfur clusters and their importance for the biosynthesis, assembly, and activity of complex metalloenzymes in this Special Issue of Inorganics, entitled “Transition Metals in Catalysis: The Functional Relationship of Fe–S Clusters and Molybdenum or Tungsten Cofactor-Containing Enzyme Systems” [...]

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Suggs, Kelvin, and Alfred Z. Msezane. "Doubly-Charged Negative Ions as Novel Tunable Catalysts: Graphene and Fullerene Molecules Versus Atomic Metals." International Journal of Molecular Sciences 21, no. 18 (2020): 6714. http://dx.doi.org/10.3390/ijms21186714.

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The fundamental mechanism underlying negative-ion catalysis involves bond-strength breaking in the transition state (TS). Doubly-charged atomic/molecular anions are proposed as novel dynamic tunable catalysts, as demonstrated in water oxidation into peroxide. Density Functional Theory TS calculations have found a tunable energy activation barrier reduction ranging from 0.030 eV to 2.070 eV, with Si2−, Pu2−, Pa2− and Sn2− being the best catalysts; the radioactive elements usher in new application opportunities. C602− significantly reduces the standard C60− TS energy barrier, while graphene incr

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Mannu, Alberto, Arnald Grabulosa та Salvatore Baldino. "Transfer Hydrogenation from 2-propanol to Acetophenone Catalyzed by [RuCl2(η6-arene)P] (P = monophosphine) and [Rh(PP)2]X (PP = diphosphine, X = Cl−, BF4−) Complexes". Catalysts 10, № 2 (2020): 162. http://dx.doi.org/10.3390/catal10020162.

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The reduction of ketones through homogeneous transfer hydrogenation catalyzed by transition metals is one of the most important routes for obtaining alcohols from carbonyl compounds. The interest of this method increases when opportune catalytic precursors are able to perform the transformation in an asymmetric fashion, generating enantiomerically enriched chiral alcohols. This reaction has been extensively studied in terms of catalysts and variety of substrates. A large amount of information about the possible mechanisms is available nowadays, which has been of high importance for the develop

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Franciò, Giancarlo, Ulrich Hintermair, and Walter Leitner. "Unlocking the potential of supported liquid phase catalysts with supercritical fluids: low temperature continuous flow catalysis with integrated product separation." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2057 (2015): 20150005. http://dx.doi.org/10.1098/rsta.2015.0005.

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Solution-phase catalysis using molecular transition metal complexes is an extremely powerful tool for chemical synthesis and a key technology for sustainable manufacturing. However, as the reaction complexity and thermal sensitivity of the catalytic system increase, engineering challenges associated with product separation and catalyst recovery can override the value of the product. This persistent downstream issue often renders industrial exploitation of homogeneous catalysis uneconomical despite impressive batch performance of the catalyst. In this regard, continuous-flow systems that allow

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