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Journal articles on the topic 'Catalysis of metal compounds'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Mamedova, Shafa Agаеvna. "METAL COMPLEX CATALYSIS." Globus 7, no. 5(62) (2021): 31–33. http://dx.doi.org/10.52013/2658-5197-62-5-7.

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Complexes of transition metals with chiral ligands are considered as catalysts. Among metal-containing organic complexes with semiconducting properties, compounds of the porphin series occupy a special place in electrocatalytic studies. The properties of the porphyrin macrocycle, their role in catalysis, and the influence of the nature of the metal on the catalytic properties of the complex are considered.

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2

Baráth, Eszter. "Selective Reduction of Carbonyl Compounds via (Asymmetric) Transfer Hydrogenation on Heterogeneous Catalysts." Synthesis 52, no. 04 (2020): 504–20. http://dx.doi.org/10.1055/s-0039-1691542.

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Based on the ever-increasing demand for optically pure compounds, the development of efficient methods to produce such products is very important. Homogeneous asymmetric catalysis occupies a prominent position in the ranking of chemical transformations, with transition metals coordinated to chiral ligands being applied extensively for this purpose. However, heterogeneous catalysts have the ability to further extend the field of asymmetric transformations, because of their beneficial properties such as high stability, ease of separation and regeneration, and the possibility to apply them in con

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3

Lukey, CA, MA Long, and JL Garnett. "Aromatic Hydrogen Isotope Exchange Reactions Catalyzed by Iridium Complexes in Aqueous Solution." Australian Journal of Chemistry 48, no. 1 (1995): 79. http://dx.doi.org/10.1071/ch9950079.

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Sodium hexachloroiridate (III) and sodium hexachloroiridate (IV) have been used as homogeneous catalysts for hydrogen isotope exchange between benzenoid compounds and water. The ideal solvent consisted of 50 mole % acetic acid/water, and the optimum temperature was found to be 160°C. Under these conditions the rate of incorporation of deuterium into benzene was significant (typically 15% D in 6 h), and reduction to iridium metal was minimized. The active catalytic species was identified as a solvated iridium(III) species, which is also postulated to be the active catalyst in solutions containi

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4

Baird, Michael C. "Catalysis by organotransition metal compounds: Synergism between the pure and the applied1." Canadian Journal of Chemistry 81, no. 4 (2003): 330–37. http://dx.doi.org/10.1139/v03-065.

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The modern era of transition-metal-catalyzed polymerization of alkenes began with the Nobel Prize winning work of Ziegler and Natta in the 1950s, but the field has exploded since the mid-1980s and anticipated applications of organometallic catalysts are being spectacularly realized. Our research in metal-catalyzed alkene polymerization began about ten years ago with an investigation of the catalytic applications of half-sandwich complexes of the Group 4 metals, and this lecture will describe our efforts to find both better initiators to make known commercial polymers and new initiators to make

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5

Melián-Rodríguez, Saravanamurugan, Meier, Kegnæs, and Riisager. "Ru-Catalyzed Oxidative Cleavage of Guaiacyl Glycerol--Guaiacyl Ether-a Representative -O-4 Lignin Model Compound." Catalysts 9, no. 10 (2019): 832. http://dx.doi.org/10.3390/catal9100832.

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The introduction of efficient and selective catalytic methods for aerobic oxidation of lignin and lignin model compounds to aromatics can extend the role of lignin applications in biorefineries. The current study focussed on the catalytic oxidative transformation of guaiacyl glycerol--guaiacyl ether (GGGE)–a -O-4 lignin model compound to produce basic aromatic compounds (guaiacol, vanillin and vanillic acid) using metal-supported catalysts. Ru/Al2O3, prepared with ruthenium(IV) oxide hydrate, showed the highest yields of the desired products (60%) in acetonitrile in a batch reactor at 160 C an

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6

Yates, D. J. C., S. K. Behal, and B. H. Kear. "Studies of reactions between gaseous organo-silicon compounds and metal surfaces." Journal of Materials Research 3, no. 4 (1988): 714–22. http://dx.doi.org/10.1557/jmr.1988.0714.

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A procedure for modifying the surface composition of catalytically active metals with silicon-containing gaseous reactants has been developed. This new gas-solid reaction method is unique in that it can be used for the in situ synthesis of catalytically interesting materials, which cannot be done by conventional solid-solid reaction techniques. Using an oxygen-free silicon compound (e.g., hexamethyldisilazane, HMDS), the metals studied fall into two categories: those that involve reaction followed by diffusion, and those that exhibit surface reaction only. The first group, consisting of the me

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7

Xue, Zhong, Zhang та Xu. "Performance of Catalytic Fast Pyrolysis using a γ-Al2O3 Catalyst with Compound Modification of ZrO2 and CeO2". Catalysts 9, № 10 (2019): 849. http://dx.doi.org/10.3390/catal9100849.

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To investigate the catalytic pyrolysis performance of complex metal oxide catalysts for biomass, γ-Al2O3 was prepared through the precipitation method, and then ZrO2 and γ-Al2O3 were blended in the proportion of 2:8 using the co-precipitation method. Next, CeO2 was loaded on the surface of the catalyst for further modification. The three catalysts, A, ZA and CZA, were obtained. The specific surface and acidity of the catalysts were characterized by nitrogen adsorption–desorption and NH3-Temperature Programmed Desorption (NH3-TPD) respectively. The catalytic pyrolysis performance of catalysts f

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8

Saeid, Soudabeh, Matilda Kråkström, Pasi Tolvanen, et al. "Synthesis and Characterization of Metal Modified Catalysts for Decomposition of Ibuprofen from Aqueous Solutions." Catalysts 10, no. 7 (2020): 786. http://dx.doi.org/10.3390/catal10070786.

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The presence of pharmaceuticals in surface water, drinking water, and wastewater has attracted significant concern because of the non-biodegradability, resistance, and toxicity of pharmaceutical compounds. The catalytic ozonation of an anti-inflammatory pharmaceutical, ibuprofen was investigated in this work. The reaction mixture was analyzed and measured by high-performance liquid chromatography (HPLC). Liquid chromatography-mass spectrometry (LC-MS) was used for the quantification of by-products during the catalytic ozonation process. Ibuprofen was degraded by ozonation under optimized condi

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9

Qiu, Jikuan, Yue Zhao, Yuling Zhao, et al. "Cu(I)/Ionic Liquids Promote the Conversion of Carbon Dioxide into Oxazolidinones at Room Temperature." Molecules 24, no. 7 (2019): 1241. http://dx.doi.org/10.3390/molecules24071241.

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Recently, the efficient chemical fixation of carbon dioxide (CO2) into high value chemicals without using noble metal catalysts has become extremely appealing from the viewpoint of sustainable chemistry. In this work, a one-pot three component reaction of propargylic alcohols, anines and CO2 that can proceed in an atom economy and environmentally benign manner by combination of CuI and tetrabutylphosphonium imidazol ([P4444][Im]) as a catalyst was described. Catalysis studies indicate that this catalytic system is an effective catalyst for the conversion of CO2 into oxazolidinones at room temp

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10

Shul’pin, Georgiy B., and Lidia S. Shul’pina. "Oxidation of Organic Compounds with Peroxides Catalyzed by Polynuclear Metal Compounds." Catalysts 11, no. 2 (2021): 186. http://dx.doi.org/10.3390/catal11020186.

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The review describes articles that provide data on the synthesis and study of the properties of catalysts for the oxidation of alkanes, olefins, and alcohols. These catalysts are polynuclear complexes of iron, copper, osmium, nickel, manganese, cobalt, vanadium. Such complexes for example are: [Fe2(HPTB)(m-OH)(NO3)2](NO3)2·CH3OH·2H2O, where HPTB-¼N,N,N0,N0-tetrakis(2-benzimidazolylmethyl)-2-hydroxo-1,3-diaminopropane; complex [(PhSiO1,5)6]2[CuO]4[NaO0.5]4[dppmO2]2, where dppm-1,1-bis(diphenylphosphino)methane; (2,3-η-1,4-diphenylbut-2-en-1,4-dione)undecacarbonyl triangulotriosmium; phenylsilse

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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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Taran, O. P., V. V. Sychev та B. N. Kuznetsov. "γ-Valerolactone as a promising solvent and basic chemical product. Catalytic synthesis from components of vegetable biomass". Kataliz v promyshlennosti 1, № 1-2 (2021): 97–116. http://dx.doi.org/10.18412/1816-0387-2021-1-2-97-116.

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γ-Valerolactone (GVL), which is a valuable chemical compound and a platform molecule, is considered as an intermediate product for the synthesis of chemical compounds with high added value, components of motor fuels and biopolymers. GVL is successfully used as an environmentally friendly solvent, fuel additive, fragrance and food additive. This review summarizes recent advances in the development of catalytic methods for the production of GVL from levulinic acid (LA), alkyl levulinates (AL), carbohydrates and vegetable polymers. Particular attention is paid to heterogeneous catalysts based on

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Kunfi, Attila, and Gábor London. "Polydopamine: An Emerging Material in the Catalysis of Organic Transformations." Synthesis 51, no. 14 (2018): 2829–38. http://dx.doi.org/10.1055/s-0037-1610260.

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Polydopamine, a ‘mussel-inspired’ polymer, has been explored extensively in materials science as a universal coating. However, as an easily available, stable and environmentally benign material, it has recently been discovered to demonstrate catalytic applications. In this short review, we briefly discuss the main approaches employing polydopamine in the catalysis of organic transformations. These include metal/polydopamine-type systems and metal-free approaches that exploit the acid/base properties of this versatile polymer.1 Introduction2 PDA and Metal Catalysis2.1 Reduction of Nitroaryl Com

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14

Pimerzin, Aleksey, Aleksander Savinov, Anna Vutolkina, et al. "Transition Metal Sulfides- and Noble Metal-Based Catalysts for N-Hexadecane Hydroisomerization: A Study of Poisons Tolerance." Catalysts 10, no. 6 (2020): 594. http://dx.doi.org/10.3390/catal10060594.

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Bifunctional catalysts on the base of transition metal sulfides (CoMoS and NiWS) and platinum as noble metal were synthesized via wetness impregnation of freshly synthesized Al2O3-SAPO-11 composites, supported with favorable acidic properties. The physical-chemical properties of the prepared materials were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), low-temperature N2 adsorption and high resolution transmission electron microscopy (HR TEM) methods. Catalytic properties were studied in n-hexadecane isomerization using a fixed-bed flow reactor. The catalytic poisons t

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15

Huang, Tiefan, Guan Sheng, Priyanka Manchanda, et al. "Cyclodextrin polymer networks decorated with subnanometer metal nanoparticles for high-performance low-temperature catalysis." Science Advances 5, no. 11 (2019): eaax6976. http://dx.doi.org/10.1126/sciadv.aax6976.

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The synthesis of support materials with suitable coordination sites and confined structures for the controlled growth of ultrasmall metal nanoparticles is of great importance in heterogeneous catalysis. Here, by rational design of a cross-linked β-cyclodextrin polymer network (CPN), various metal nanoparticles (palladium, silver, platinum, gold, and rhodium) of subnanometer size (<1 nm) and narrow size distribution are formed via a mild and facile procedure. The presence of the metal coordination sites and the network structure are key to the successful synthesis and stabilization of the ul

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16

Liu, Chang Bo, and Chang Sheng Yue. "Metal Sulfide Assisted Coal Catalytic Hydrogenated Microwave Pyrolysis." Materials Science Forum 999 (June 2020): 178–90. http://dx.doi.org/10.4028/www.scientific.net/msf.999.178.

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The efficient cleaning conversion of coal is more and more attracted due to resource exhaustion and environmental pollution. To improve the yield and quality of products of coal pyrolysis, the catalytic hydrogenated microwave pyrolysis was introduced, and the effects of metal sulfide on hydrogenated microwave pyrolysis were focused on discuss via the detection methods of proximate and ultimate analyses, SEM-EDS, FT-IR and GC-MS in this work. The results shown that because of the “hot-spot” effect and the characteristics of electromagnetic loss of metal sulfide, the temperature-rising rates wit

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17

Alvarez-Galvan, M., Jose Campos-Martin, and Jose Fierro. "Transition Metal Phosphides for the Catalytic Hydrodeoxygenation of Waste Oils into Green Diesel." Catalysts 9, no. 3 (2019): 293. http://dx.doi.org/10.3390/catal9030293.

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Recently, catalysts based on transition metal phosphides (TMPs) have attracted increasing interest for their use in hydrodeoxygenation (HDO) processes destined to synthesize biofuels (green or renewable diesel) from waste vegetable oils and fats (known as hydrotreated vegetable oils (HVO)), or from bio-oils. This fossil-free diesel product is produced completely from renewable raw materials with exceptional quality. These efficient HDO catalysts present electronic properties similar to noble metals, are cost-efficient, and are more stable and resistant to the presence of water than other class

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18

Xin, Yunzi, Yuri Ando, Sohei Nakagawa, Harumitsu Nishikawa, and Takashi Shirai. "New possibility of hydroxyapatites as noble-metal-free catalysts towards complete decomposition of volatile organic compounds." Catalysis Science & Technology 10, no. 16 (2020): 5453–59. http://dx.doi.org/10.1039/d0cy00787k.

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19

Galiwango, Emmanuel, Ali H. Al-Marzuoqi, Abbas A. Khaleel, and Mahdi M. Abu-Omar. "Catalytic Depolymerization of Date Palm Waste to Valuable C5–C12 Compounds." Catalysts 11, no. 3 (2021): 371. http://dx.doi.org/10.3390/catal11030371.

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Lignin depolymerization often requires multiple isolation steps to convert a lignocellulose matrix into high-value chemicals. In addition, lignin structural modification, low yields, and poor product characteristics remain challenges. Direct catalytic depolymerization of lignocellulose from date palm biomass was investigated. Production of high value chemicals heavily depends on optimization of different parameters and method of conversion. The goal of the study was to elucidate the role of different parameters on direct conversion of date palm waste in a bench reactor, targeting valuable C5–C

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20

Migliori, Massimo, Antonio Condello, Francesco Dalena, Enrico Catizzone, and Girolamo Giordano. "CuZnZr-Zeolite Hybrid Grains for DME Synthesis: New Evidence on the Role of Metal-Acidic Features on the Methanol Conversion Step." Catalysts 10, no. 6 (2020): 671. http://dx.doi.org/10.3390/catal10060671.

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The assessment of the catalytic performance of “hybrid” metal/zeolite catalysts (based on FER or MFI structure and CuZnZr metal complexes) in the methanol dehydration step to DME has been studied in this work. The results clearly show that there is an important effect of the interaction between metal and acid sites affecting the acid catalyst performances. Additionally, deactivation, studied by means of a Timo-on-Stream (TOS) test, was affected by the type of zeolite structure used for hybrid catalyst preparation. The decrease in DME selectivity can be attributed to the cooperation of metal an

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21

Zarkadoulas, Athanasios, Ioanna Zgouleta, Nikolaos V. Tzouras, and Georgios C. Vougioukalakis. "Traceless Directing Groups in Sustainable Metal-Catalyzed C–H Activation." Catalysts 11, no. 5 (2021): 554. http://dx.doi.org/10.3390/catal11050554.

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Sustainable transformations towards the production of valuable chemicals constantly attract interest, both in terms of academic and applied research. C–H activation has long been scrutinized in this regard, given that it offers a straightforward pathway to prepare compounds of great significance. In this context, directing groups (DG) have paved the way for chemical transformations that had not been achievable using traditional reactions. Few steps, high yields, selectivity and activation of inert substrates are some of the invaluable assets of directed catalysis. Additionally, the employment

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22

Grabchenko, M., N. Mikheeva, G. Mamontov, M. Salaev, L. Liotta, and O. Vodyankina. "Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs." Catalysts 8, no. 7 (2018): 285. http://dx.doi.org/10.3390/catal8070285.

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Nowadays catalytic technologies are widely used to purify indoor and outdoor air from harmful compounds. Recently, Ag–CeO2 composites have found various applications in catalysis due to distinctive physical-chemical properties and relatively low costs as compared to those based on other noble metals. Currently, metal–support interaction is considered the key factor that determines high catalytic performance of silver–ceria composites. Despite thorough investigations, several questions remain debating. Among such issues, there are (1) morphology and size effects of both Ag and CeO2 particles, i

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23

Osipov, Sergey, and Daria Vorobyeva. "Selective Synthesis of 2- and 7-Substituted Indole Derivatives via Chelation-Assisted Metallocarbenoid C–H Bond Functionalization." Synthesis 50, no. 02 (2017): 227–40. http://dx.doi.org/10.1055/s-0036-1591498.

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Functionally substituted indole derivatives are important intermediates for the synthesis of new potential drug candidates exhibiting strong bioactivities. Over the past few years, significant progress has been made in the direct C–H functionalization of the indole ring through the usage of metal-catalyzed intermolecular cross-coupling with diazo compounds. Directing group strategy provides a unique possibility for selective insertion of carbenes catalytically generated from diazo compounds into challenging indole C2–H and C7–H bonds. This short review summarizes recent advances in carbenoid f

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24

Pérez-Mayoral, Elena, Ines Matos, María Bernardo, Marcia Ventura, and Isabel M. Fonseca. "Carbon-Based Materials for the Development of Highly Dispersed Metal Catalysts: Towards Highly Performant Catalysts for Fine Chemical Synthesis." Catalysts 10, no. 12 (2020): 1407. http://dx.doi.org/10.3390/catal10121407.

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Single-atom catalysts (SACs), consisting of metals atomically dispersed on a support, are considered as advanced materials bridging homogeneous and heterogeneous catalysis, representing the catalysis at the limit. The enhanced performance of these catalysts is due to the combination of distinct factors such as well-defined active sites, comprising metal single atoms in different coordination environments also varying its valence state and strongly interacting with the support, in this case porous carbons, maximizing then the metal efficiency in comparison with other metal surfaces consisting o

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25

Ball, Philip. "Single-atom catalysis: a new field that learns from tradition." National Science Review 5, no. 5 (2018): 690–93. http://dx.doi.org/10.1093/nsr/nwy043.

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Abstract Much of industrial chemical processing (in the petrochemicals industry, for example), and a great deal of laboratory chemical synthesis, involves catalysts that both lower the energy barrier to reaction and may help steer a reaction along a particular path. Traditionally, catalysts have come in two classes: heterogeneous, typically meaning that the catalyst is an extended solid; and homogeneous, where the catalyst is a small molecule that shares a solvent with the reactants. In heterogeneous catalysis, the reaction generally takes place on a surface, involving molecules attached there

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26

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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27

Dou, Xiaomeng, Wenzhi Li, Chaofeng Zhu, Xiao Jiang, Hou-min Chang, and Hasan Jameel. "Cleavage of aryl–ether bonds in lignin model compounds using a Co–Zn-beta catalyst." RSC Advances 10, no. 71 (2020): 43599–606. http://dx.doi.org/10.1039/d0ra08121c.

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The catalytic hydrogenolysis of lignin model compounds containing aryl–ether linkages by Co–Zn-beta catalyst is investigated to understand the role of “Lewis acid-metal” catalysts in lignin depolymerization.

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Cabral Almada, Cédric, Aleksandr Kazachenko, Pascal Fongarland, Denilson Da Silva Perez, Boris N. Kuznetsov, and Laurent Djakovitch. "Supported-Metal Catalysts in Upgrading Lignin to Aromatics by Oxidative Depolymerization." Catalysts 11, no. 4 (2021): 467. http://dx.doi.org/10.3390/catal11040467.

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Supported gold and platinum particles on titanium oxide catalysts were evaluated in the oxidative depolymerization of lignins toward high added value aromatics under mild conditions (T: 150 °C, Pair: 20 bar, CNaOH: 10 g/L, 1 h). Kraft and ethanol Organosolv lignins were engaged in the study. Gold catalyst showed a strong tendency to further oxidize aromatics produced from lignin depolymerization to volatile compounds leading to very low yield in target molecules. On the contrary, platinum-based catalysts were allowed to observe enhanced yields that were attributed to its ability to preserve li

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BRUNNER, H., and W. ZETTLMEIER. "ChemInform Abstract: In situ Catalysts in Enantioselective Catalysis with Transition-Metal Compounds." ChemInform 27, no. 36 (2010): no. http://dx.doi.org/10.1002/chin.199636261.

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30

Chacón, Gustavo, Jérôme Durand, Isabelle Favier, Emmanuelle Teuma, and Montserrat Gomez. "Ionic liquids in catalysis: molecular and nanometric metal systems." French-Ukrainian Journal of Chemistry 4, no. 1 (2016): 23–36. http://dx.doi.org/10.17721/fujcv4i1p23-36.

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The catalyst immobilization in a liquid phase represents an attractive means to preserve high activities and selectivities, also permitting an easy recycling. To attain this goal, organic products should be extracted in a simple way from the catalytic phase leading to metal-free target compounds; for this reason, ionic liquids exhibiting high affinity for metallic species and low affinity for low polar compounds, turn into a promising medium, in particular for the synthesis of fine chemicals. In the present Accounts, we illustrate this approach through our research involving both molecular org

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Latypova, Adele R., Dmitry V. Filippov, Olga V. Lefedova, Alexey V. Bykov, and Valentin Yu Doluda. "ENVIRONMENTALLY SAFE SYNTHESIS OF HYDROGENATION NICKEL CATALYSTS." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 9 (2019): 46–52. http://dx.doi.org/10.6060/ivkkt.20196209.6065.

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New types of nickel catalysts are proposed. They are formed during the surface deposition of nickel polynuclear hydroxo complexes on powdered carriers with subsequent reduction to the metal. This method of synthesis is environmentally friendly, safe and waste-free technology. Industrial wastewater will contain only an aqueous solution of sodium chloride and sodium carbonate. The catalytic activity was determined by the p-nitroaniline hydrogenation at 240 °C and 40 bar of hydrogen pressure. The properties and characteristics of the catalysts were studied using thermo-programmable desorption of

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32

Kung, Mayfair C., Mark V. Riofski, Michael N. Missaghi, and Harold H. Kung. "Organosilicon platforms: bridging homogeneous, heterogeneous, and bioinspired catalysis." Chem. Commun. 50, no. 25 (2014): 3262–76. http://dx.doi.org/10.1039/c3cc48766k.

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Organosilicon compounds form versatile structures such as cubic metallasiloxanes, cage-like silsesquioxanes, macromolecular nanocages, and flexible dendrimers and linear metallasiloxanes, and are useful as catalysts, ligands for metal complexes, and catalyst supports.

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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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Alvarado Rupflin, Luis, Chiara Boscagli, and Stephan Schunk. "Platinum Group Metal Phosphides as Efficient Catalysts in Hydroprocessing and Syngas-Related Catalysis." Catalysts 8, no. 3 (2018): 122. http://dx.doi.org/10.3390/catal8030122.

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Platinum group metal phosphides are reviewed as catalytic materials for hydroprocessing and syngas-related catalysis. Starting from synthetic procedures leading to highly disperse nano-particular compounds, their properties in the applications are discussed and compared with relevant benchmarks, if available. Regarding their mode of action, two confronting mechanistic scenarios are presented: (i) a cooperative scenario in which catalytic sites of different functionalities are active in hydroprocessing and (ii) single site catalysis, which appears to be the relevant mode of action in syngas-rel

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35

Ushikubo, Takashi, and Keisuke Wada. "Japan-France seminar on catalysis with metal compounds." Applied Catalysis 35, no. 1 (1987): 192. http://dx.doi.org/10.1016/s0166-9834(00)82440-9.

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36

Tanaka, Ken-ichi. "Intermediate Compounds Formed on Metal Surfaces during Catalysis." Progress of Theoretical Physics Supplement 106 (1991): 419–31. http://dx.doi.org/10.1143/ptps.106.419.

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Katsuki, Tsutomu. "Handbook of Enantioselective Catalysis with Transition Metal Compounds." Synthesis 1994, no. 04 (1994): 444. http://dx.doi.org/10.1055/s-1994-25495.

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38

Brown, John M. "Handbook of enantioselective catalysis with transition metal compounds." Journal of Organometallic Chemistry 479, no. 1-2 (1994): c30. http://dx.doi.org/10.1016/0022-328x(94)84125-x.

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Arisawa, Mieko. "Transition-Metal-Catalyzed Synthesis of Organophosphorus Compounds Involving P–P Bond Cleavage." Synthesis 52, no. 19 (2020): 2795–806. http://dx.doi.org/10.1055/s-0040-1707890.

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Organophosphorus compounds are used as drugs, pesticides, detergents, food additives, flame retardants, synthetic reagents, and catalysts, and their efficient synthesis is an important task in organic synthesis. To synthesize novel functional organophosphorus compounds, transition-metal-catalyzed methods have been developed, which were previously considered difficult because of the strong bonding that occurs between transition metals and phosphorus. Addition reactions of triphenylphosphine and sulfonic acids to unsaturated compounds in the presence of a rhodium or palladium catalyst lead to ph

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Ollevier, Thierry, Virginie Carreras, and Nour Tanbouza. "The Power of Iron Catalysis in Diazo Chemistry." Synthesis 53, no. 01 (2020): 79–94. http://dx.doi.org/10.1055/s-0040-1707272.

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AbstractThe use of iron catalysis to enable reactions with diazo compounds has emerged as a valuable tool to forge carbon–carbon or carbon–heteroatom bonds. While diazo compounds are often encountered with toxic and expensive metal catalysts, such as Rh, Ru, Pd, Ir, and Cu, a resurgence of Fe catalysis has been observed. This short review will showcase and highlight the recent advances in iron-mediated reactions of diazo compounds.1 Introduction2 Insertion Reactions2.1 Insertion into B–H Bonds2.2 Insertion into Si–H Bonds2.3 Insertion into N–H Bonds2.4 Insertion into S–H bonds3 Ylide Formation

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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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Okumura, Hideyuki, K. Arai, Y. Nishiyama, Eiji Yamasue, and Keiichi N. Ishihara. "Revisiting Carbon Based Metallic Compounds – Nanoscale Surface Science and Environmental Catalysis." Materials Science Forum 638-642 (January 2010): 858–63. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.858.

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Catalytic ability on 12 kinds of carbide powders was investigated at room temperature using NOx gas degradation. They are largely classified into two groups, depending on whether the reaction involves a nitrogen gas in air or not. The carbon dangling bonds largely contribute to the reaction, while the accompanied metal atoms play an important role for adsorbing/dissociating nitrogen gas. Mechanical milling or annealing, as long as without agglomeration, is an effective method for activating powder catalysis, producing new surfaces with plenty catalytic sites. A new concept of catalysis is pres

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Moirangthem, Soniya D., Bhavna Thingom, and Warjeet S. Laitonjam. "Cd-proline Complex Catalyzed Direct one-Pot three Component Mannich Reaction in Water Medium." JOURNAL OF ADVANCES IN CHEMISTRY 7, no. 1 (2011): 1160–68. http://dx.doi.org/10.24297/jac.v7i1.970.

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Metal-proline complexes of various metals like Zn, Cd, Hg, and Pb were found to be good catalysts for direct Mannich reaction in water medium at room temperature, smoothly affording the β-amino carbonyl compounds in excellent yields. Among the catalyst cadmium-proline complex gave high yield in lesser time. All the catalysts were easily separated from the reaction mixture by water extraction and among this cadmium -proline complex was found to be most stable and can be recycled five times without losing its catalytic activity.

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Wetchasat, Piraya, Saros Salakhum, Thidarat Imyen, et al. "One-Pot Synthesis of Ultra-Small Pt Dispersed on Hierarchical Zeolite Nanosheet Surfaces for Mild Hydrodeoxygenation of 4-Propylphenol." Catalysts 11, no. 3 (2021): 333. http://dx.doi.org/10.3390/catal11030333.

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The rational design of ultra-small metal clusters dispersed on a solid is of crucial importance in modern nanotechnology and catalysis. In this contribution, the concept of catalyst fabrication with a very ultra-small size of platinum nanoparticles supported on a hierarchical zeolite surface via a one-pot hydrothermal system was demonstrated. Combining the zeolite gel with ethylenediaminetetraacetic acid (EDTA) as a ligand precursor during the crystallization process, it allows significant improvement of the metal dispersion on a zeolite support. To illustrate the beneficial effect of ultra-sm

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Al-Zubaidi, Isam, and Congning Yang. "Waste Management of Spent Petroleum Refinery Catalyst." European Journal of Engineering Research and Science 5, no. 8 (2020): 938–47. http://dx.doi.org/10.24018/ejers.2020.5.8.1929.

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Petroleum refinery uses many catalysts such as hydroprocessing catalyst HPC, fluid catalytic cracking catalyst FCCC, reforming catalyst RC, etc. During the refining processes, the catalysts are deactivated; the spent catalysts are regarded as hazardous toxic materials due to heavy metals, coke, other poisonous compounds, and hydrocarbons. Huge amount of spent catalysts SC is generated which is expected to increase with expansion capacities of available refineries processes. This paper is reviewing the mechanisms of refining catalyst and the deactivation processes and focusing on spent catalyst

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Goodwin, Vituruch, Phanwatsa Amnaphiang, Pimpreeya Thungngern, Kong Kah Shin, Parncheewa Udomsap, and Nuwong Chollacoop. "Zeolite Supported Bimetallic Catalyst System: The Effect of Metal Loading for Catalytic Pyrolysis of Jatropha Residue." Key Engineering Materials 751 (August 2017): 494–99. http://dx.doi.org/10.4028/www.scientific.net/kem.751.494.

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Two transition metals were loaded on H-ZSM-5 zeolite to produce bimetallic zeolite supported catalysts for catalytic pyrolysis reaction. Ni and Co metal were loaded on H-ZSM-5 via wet impregnation method. The loading sequence was applied using one-step and two-step loading method. The different loading sequence affect surface properties of catalyst and catalytic activity in pyrolysis reaction. The bimetallic catalysts were prepared at Ni+Co metal loading content of 10+10 wt% (Ni:Co=1:1) to 10+20 wt% (Ni:Co=1:2 or 2:1). All bimetallic catalysts supported on H-ZSM-5 were calcined and characteriz

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Stamatis, A., G. Malandrinos, M. Louloudi, and N. Hadjiliadis. "New Perspectives on Thiamine Catalysis: From Enzymic to Biomimetic Catalysis." Bioinorganic Chemistry and Applications 2007 (2007): 1–7. http://dx.doi.org/10.1155/2007/23286.

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This paper is a brief review of the detailed mechanism of action of thiamine enzymes, based on metal complexes of bivalent transition and post-transition metals of model compounds, thiamine derivatives, synthesized and characterized with spectroscopic techniques and X-ray crystal structure determinations. It is proposed that the enzymatic reaction is initiated with a V conformation of thiamine pyrophosphate, imposed by the enzymic environment. Thiamine pyrophosphate is linked with the proteinic substrate through its pyrophosphate oxygens. In the course of the reaction, the formation of the “ac

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Lin, Wenbin. "Metal-Organic Frameworks for Asymmetric Catalysis and Chiral Separations." MRS Bulletin 32, no. 7 (2007): 544–48. http://dx.doi.org/10.1557/mrs2007.104.

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Metal-organic frameworks (MOFs) are an interesting class of molecule-based hybrid materials built from metal-connecting points and bridging ligands. MOFs have received much attention, owing to their potential impact on many technological areas, including gas storage, separation, and heterogeneous catalysis. The modular nature of MOFs endows them with facile tunability, and as a result, properly designed MOFs can yield ideal heterogeneous catalysts with uniform active sites through judicious choice of the building blocks. Homochiral MOFs, which can be prepared by numerous approaches (constructi

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Liu, Hongfang, Anh Quang Dao, and Chaoyang Fu. "Activities of Combined TiO2 Semiconductor Nanocatalysts Under Solar Light on the Reduction of CO2." Journal of Nanoscience and Nanotechnology 16, no. 4 (2016): 3437–46. http://dx.doi.org/10.1166/jnn.2016.11854.

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The materials based on TiO2 semiconductors are a promising option for electro-photocatalytic systems working as solar energy low-carbon fuels exchanger. These materials’ structures are modified by doping metals and metal oxides, by metal sulfides sensitization, or by graphene supported membrane, enhancing their catalytic activity. The basic phenomenon of CO2 reduction to CH4 on Pd modified TiO2 under UV irradiation could be enhanced by Pd, or RuO2 co-doped TiO2. Sensitization with metal sulfide QDs is effective by moving of photo-excited electron from QDs to TiO2 particles. Based on characteri

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Lim, Taeho, and Min Su Han. "Preparation of Metal Oxides Containing ppm Levels of Pd as Catalysts for the Reduction of Nitroarene and Evaluation of Their Catalytic Activity by the Fluorescence-Based High-Throughput Screening Method." Catalysts 10, no. 5 (2020): 542. http://dx.doi.org/10.3390/catal10050542.

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Herein, an easily accessible and efficient green method for the reduction of nitroarene compounds was developed using metal oxide catalysts. Heterogeneous metal oxides with or without Pd were prepared by a simple and scalable co-precipitation method and used for the reduction of nitroarenes. A fluorescence-based high-throughput screening (HTS) method was also developed for the rapid analysis of the reaction conditions. The catalytic activity of the metal oxides and reaction conditions were rapidly screened by the fluorescence-based HTS method, and Pd/CuO showed the highest catalytic activity u

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