Living Polymerization of α-Olefins at Elevated Temperatures Catalyzed by a Highly Active and Robust Cyclophane-Based Nickel Catalyst

2005 ◽  
Vol 38 (7) ◽  
pp. 2544-2546 ◽  
Author(s):  
Drexel H. Camacho ◽  
Zhibin Guan
Keyword(s):  
Nickel Catalyst ◽  
Elevated Temperatures ◽  
Living Polymerization ◽  
Highly Active

Chelating diamide complexes of titanium: new catalyst precursors for the highly active and living polymerization of α-olefins

1998 ◽  
Vol 128 (1-3) ◽  
pp. 201-214 ◽  
Author(s):  
John D. Scollard ◽  
David H. McConville ◽  
Jagadese J. Vittal ◽  
Nicholas C. Payne
Keyword(s):  
Living Polymerization ◽  
Highly Active

Regioselective living polymerization of allylcyclohexane and precise synthesis of hydrocarbon block copolymers with cyclic units

2018 ◽  
Vol 9 (9) ◽  
pp. 1109-1115 ◽  
Author(s):  
Jie Gao ◽  
Zonghang Ying ◽  
Liu Zhong ◽  
Heng Liao ◽  
Haiyang Gao ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Nickel Catalyst ◽  
Living Polymerization ◽  
Sequential Monomer Addition

Regioselective living polymerization of allylcyclohexane was catalyzed by a bulky α-diimine nickel catalyst. Well-defined hydrocarbon block copolymers with cyclic units were constructed by sequential monomer addition.

scholarly journals The Preparation of a Highly Active Raney Nickel Catalyst with Formation of a Recoverable Bayerite

1985 ◽  
Vol 58 (1) ◽  
pp. 391-392 ◽  
Author(s):  
Shigeo Nishimura ◽  
Satoshi Ikeda ◽  
Makoto Kinoshita ◽  
Masaaki Kawashima
Keyword(s):  
Nickel Catalyst ◽  
Raney Nickel ◽  
Raney Nickel Catalyst ◽  
Highly Active

scholarly journals Ultra-high molecular weight elastomeric polyethylene using an electronically and sterically enhanced nickel catalyst

2017 ◽  
Vol 8 (41) ◽  
pp. 6416-6430 ◽  
Author(s):  
Qaiser Mahmood ◽  
Yanning Zeng ◽  
Erlin Yue ◽  
Gregory A. Solan ◽  
Tongling Liang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
High Molecular Weight ◽  
Nickel Catalyst ◽  
High Tensile Strength ◽  
Elongation At Break ◽  
Highly Active ◽  
High Elongation ◽  
Ultra High Molecular Weight ◽  
Shape Fixity

Highly active para-t-Bu-containing 1,2-bis(imino)acenaphthene-Ni(ii) catalysts are disclosed which afford hyper-branched PEs with Mw's up to 3.1 × 106 g mol−1; high tensile strength, excellent shape fixity as well as high elongation at break are a feature.

scholarly journals Influence of Hydrogenation on Morphology, Chemical Structure and Photocatalytic Efficiency of Graphitic Carbon Nitride

2021 ◽  
Vol 22 (23) ◽  
pp. 13096
Author(s):  
Daria Baranowska ◽  
Tomasz Kędzierski ◽  
Małgorzata Aleksandrzak ◽  
Ewa Mijowska ◽  
Beata Zielińska
Keyword(s):  
Photocatalytic Activity ◽  
Active Sites ◽  
Chemical Structure ◽  
Carbon Nitride ◽  
Elevated Temperatures ◽  
Hydrogen Atmosphere ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Efficiency ◽  
Highly Active

In this contribution, the effect of hydrogenation conditions atmosphere (temperature and time) on physicochemical properties and photocatalytic efficiency of graphitic carbon nitride (g-C3N4, gCN) was studied in great details. The changes in the morphology, chemical structure, optical and electrochemical properties were carefully investigated. Interestingly, the as-modified samples exhibited boosted photocatalytic degradation of Rhodamine B (RhB) with the assistance of visible light irradiation. Among modified gCN, the sample annealed at 500 °C for 4 h (500-4) in H2 atmosphere exhibited the highest photocatalytic activity—1.76 times higher compared to pristine gCN. Additionally, this sample presented high stability and durability after four cycles. It was noticed that treating gCN with hydrogen at elevated temperatures caused the creation of nitrogen vacancies on gCN surfaces acting as highly active sites enhancing the specific surface area and improving the mobility of photogenerated charge carriers leading to accelerating the photocatalytic activity. Therefore, it is believed that detailed optimization of thermal treatment in a hydrogen atmosphere is a facile approach to boost the photoactivity of gCN.

Metal-Support Interactions and C1 Chemistry: Transforming Pt-CeO2 into a Highly Active and Stable Catalyst for the Conversion of Carbon Dioxide and Methane

2020 ◽  
Author(s):  
Feng Zhang ◽  
Ramón A. Gutiérrez ◽  
Pablo Lustemberg ◽  
Zongyuan Liu ◽  
Ning Rui ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Metal Oxide ◽  
Elevated Temperatures ◽  
Chemical Properties ◽  
Oxide Interface ◽  
Highly Active ◽  
Metal Support ◽  
Metal Support Interactions ◽  
Methane Dissociation

There is an ongoing search for materials which can accomplish the activation of two dangerous greenhouse gases like carbon dioxide and methane. In the area of C1 chemistry, the reaction between CO2 and CH4 to produce syngas, known as methane dry reforming (MDR), is attracting a lot of interest due to its green nature. On Pt(111), elevated temperatures are necessary to activate the reactants and massive deposition of carbon makes this metal surface ineffective for the MDR process. In this study, we show that strong metal-support interactions present in Pt/CeO2(111) and Pt/CeO2 powders lead to systems which can bind well CO2 and CH4 at room temperature and are excellent and stable catalysts for the MDR process at moderate temperature (500 ºC). The behaviour of these systems was studied using a combination of in-situ/operando methods which pointed to an active Pt-CeO2-x interface. In this interface, the oxide is far from being a passive spectator. It modifies the chemical properties of Pt, facilitating improved methane dissociation, and is directly involved in the adsorption and dissociation of CO2 making the MDR catalytic cycle possible. A comparison of the benefits gained by the use of an effective metal-oxide interface and those obtained by plain bimetallic bonding indicates that the former is much more important when optimizing the C1 chemistry associated with CO2 and CH4 conversion. The presence of elements with a different chemical nature at the metal-oxide interface opens the possibility for truly cooperative interactions in the activation of C-O and C-H bonds.

Living Polymerization of Olefins with Highly Active Vanadium Catalysts

1988 ◽  
pp. 379-388 ◽  
Author(s):  
Yoshiharu Doi ◽  
Naoko Tokuhiro ◽  
Masataka Nunomura ◽  
Hiroto Miyake ◽  
Sigeo Suzuki ◽  
...  
Keyword(s):  
Living Polymerization ◽  
Vanadium Catalysts ◽  
Highly Active

Chiral arylnickel complexes as highly active initiators for screw-sense selective living polymerization of 1,2-diisocyanobenzenes

2010 ◽  
Vol 48 (4) ◽  
pp. 898-904 ◽  
Author(s):  
Tetsuya Yamada ◽  
Hiroyoshi Noguchi ◽  
Yuuya Nagata ◽  
Michinori Suginome
Keyword(s):  
Living Polymerization ◽  
Highly Active
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