Kohlenstoffnanoröhren: ein Beispiel für eine Multiskalen‐Entwicklung – mechanistische Betrachtung vom Subnanometer‐ bis zum Metermaßstab

Mleczko, Lesław; Lolli, Giulio

doi:10.1002/ange.201302791

Cited by 5 publications

(2 citation statements)

References 83 publications

(100 reference statements)

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“…A precursor solution was prepared from 0.610 g RuCl 3 $xH 2 O (41 wt% Ru) and 250 mL deionized water, to which 4.75 g NCNT were added. The latter had been prepared as reported elsewhere 36 and consists of agglomerates containing particles sizes between 100 mm and 800 mm and a maximum in the particle size distribution at 355 mm. 150 mL of a 30% aqueous solution of H 2 O 2 were then added drop wise and under stirring keeping T # 60 C. Aer complete addition, the mixture was heated to 80 C for further 3 h. The overall procedure took 5 h. The impregnated catalyst was ltered, washed, and dried in an oven at T ¼ 100 C The amount of water for the washing was on average 50 mL per 1 g of NCNT/Ru.…”

Section: Discussionmentioning

confidence: 99%

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Green catalysis by nanoparticulate catalysts developed for flow processing? Case study of glucose hydrogenation

et al. 2015

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Heterogeneous catalysis, flow chemistry, continuous processing, green solvents, catalyst immobilization and recycling are some of the most relevant, emerging key technologies to achieve green synthesis. However, a quantification of potential effects on a case to case level is required to provide a profound answer, whether they can lead to a superior process compared to the industrial standard. To do so, holistic environmental assessment approaches are very useful tools providing insights and decision support during the process development phase. Herein, novel heterogeneous nanoparticulate ruthenium catalysts immobilized on hyperbranched polystyrene (HPS) and nitrogen-doped carbon nanotubes (NCNT) were investigated with respect to their potential environmental impacts and improvements if utilized in an industrially highly relevant process, namely glucose hydrogenation to sorbitol. The results of a comparative Life Cycle Assessment of the alternative catalytic systems under consideration of RANEY® nickel as benchmark catalyst revealed that in particular Ru nanoparticles on porous HPS beads processed under flow-chemistry conditions have the potential to improve the greenness of the overall synthesis, but the concentration of glucose in the reaction mixture is in fact the most influential parameter

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Section: Discussionmentioning

confidence: 99%

“…The shape of the tubes allows a good accessibility for the substrate to the catalytically active metal and good transportation properties. 35,36 Doping the CNT with N-atoms leads to an additional functionality for the attachment of the nanoparticles.…”

Section: Novel Catalytic Systems Focused Within Polycat: Nanoparticul...mentioning

confidence: 99%

Green catalysis by nanoparticulate catalysts developed for flow processing? Case study of glucose hydrogenation

et al. 2015

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Encapsulated Cobalt Oxide on Carbon Nanotube Support as Catalyst for Selective Continuous Hydrogenation of the Showcase Substrate 1‐Iodo‐4‐nitrobenzene

et al. 2016

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Acarbon nanotube supported catalyst containing cobalt/cobalto xide (Co/Co 3 O 4 )n anoparticles encapsulatedw ithin as hell of nitrogen-doped graphene layers (Co 3 O 4 /NGr@CNT) was prepared. It shows excellent chemoselectivity in the hydrogenation of 1-iodo-4-nitrobenzene,w hich contains an iodine substituenth ighly sensitive against hydrodehalogenation. In contrast to traditional activated charcoal-supported catalysts such as Pt-V/C or the closely relatedV ulcan carbon black supported Co 3 O 4 /NGr@C, the advantageous morphological properties of the CNT support allow for the applica-tion of the new Co 3 O 4 /NGr@CNT as af ixed bed catalyst in ac ontinuous flow reactor. Under optimized conditions,n od ehalogenation side productsc ould be detected. This remarkable selectivity in combination with its mechanical stability under operation conditions renderC o 3 O 4 /NGr@CNT ac atalyst particularly relevant for applicationi nc ontinuousp rocesses based on apacked bed reactor.

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Co₃O₄–MnO₂–CNT Hybrids Synthesized by HNO₃ Vapor Oxidation of Catalytically Grown CNTs as OER Electrocatalysts

et al. 2015

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An efficient two‐step gas‐phase method was developed for the synthesis of Co3O4–MnO2–CNT hybrids used as electrocatalysts in the oxygen evolution reaction (OER). Spinel Co–Mn oxide was used for the catalytic growth of multiwalled carbon nanotubes (CNTs) and the amount of metal species remaining in the CNTs was adjusted by varying the growth time. Gas‐phase treatment in HNO3 vapor at 200 °C was performed to 1) open the CNTs, 2) oxidize encapsulated Co nanoparticles to Co3O4 as well as MnO nanoparticles to MnO2, and 3) to create oxygen functional groups on carbon. The hybrid demonstrated excellent OER activity and stability up to 37.5 h under alkaline conditions, with longer exposure to HNO3 vapor up to 72 h beneficial for improved electrocatalytic properties. The excellent OER performance can be assigned to the high oxidation states of the oxide nanoparticles, the strong electrical coupling between these oxides and the CNTs as well as favorable surface properties rendering the hybrids a promising alternative to noble metal based OER catalysts.

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Kohlenstoffnanoröhren: ein Beispiel für eine Multiskalen‐Entwicklung – mechanistische Betrachtung vom Subnanometer‐ bis zum Metermaßstab

Cited by 5 publications

References 83 publications

Green catalysis by nanoparticulate catalysts developed for flow processing? Case study of glucose hydrogenation

Green catalysis by nanoparticulate catalysts developed for flow processing? Case study of glucose hydrogenation

Encapsulated Cobalt Oxide on Carbon Nanotube Support as Catalyst for Selective Continuous Hydrogenation of the Showcase Substrate 1‐Iodo‐4‐nitrobenzene

Co₃O₄–MnO₂–CNT Hybrids Synthesized by HNO₃ Vapor Oxidation of Catalytically Grown CNTs as OER Electrocatalysts

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Kohlenstoffnanoröhren: ein Beispiel für eine Multiskalen‐Entwicklung – mechanistische Betrachtung vom Subnanometer‐ bis zum Metermaßstab

Cited by 5 publications

References 83 publications

Green catalysis by nanoparticulate catalysts developed for flow processing? Case study of glucose hydrogenation

Green catalysis by nanoparticulate catalysts developed for flow processing? Case study of glucose hydrogenation

Encapsulated Cobalt Oxide on Carbon Nanotube Support as Catalyst for Selective Continuous Hydrogenation of the Showcase Substrate 1‐Iodo‐4‐nitrobenzene

Co3O4–MnO2–CNT Hybrids Synthesized by HNO3 Vapor Oxidation of Catalytically Grown CNTs as OER Electrocatalysts

Contact Info

Product

Resources

About

Co₃O₄–MnO₂–CNT Hybrids Synthesized by HNO₃ Vapor Oxidation of Catalytically Grown CNTs as OER Electrocatalysts