Results 41 to 50 of about 470,273 (164)

Organic Nanoparticles as Fragmentable Support for Ziegler-Natta Catalysts

, 2015
A fragmentable support material for Ziegler-Natta catalysts is presented based on micrometer-sized aggregates of polystyrene nanoparticles. Hydroxyl anchoring groups are introduced by copolymerization of hydroxymethylstyrene in emulsion process to ...
Sven Nietzel, Alsaygh, A., Gerhard Fink, Joe, D., Nietzel, S., Frank Schellenberger, Schellenberger, F., Muellen, K., Abdulhamid A. Alsaygh, Joseph W. Krumpfer, Krumpfer, J., Markus Klapper, Fink, G., Daejune Joe, Klaus Müllen, Klapper, M., Müllen, K.   +16 more
core   +1 more source

Effect of the synthesis conditions of titanium-magnesium catalysts on the composition, structure and performance in propylene polymerization [PDF]

Polyolefins Journal, 2016
Supported catalysts synthesized via the interaction of Mg(OEt)2 with TiCl4 in the presence or absence of an internal stereoregulating donor (di-n-butyl phthalate), with different solvents (chlorobenzene, n-undecane, n-heptane) at different titanation ...
Natalya Chumachenko, Vladimir Zakharov, Sergey Sergeev, Svetlana Cherepanova   +3 more
doaj   +1 more source

Chemical state analysis of magnesium-supported Ziegler-Natta catalyst by soft X-ray emission spectrometer (SXES) after contact with alkyl aluminum [PDF]

Polyolefins Journal
This report is on the characterization of active Ti center in heterogeneous Ziegler-Natta catalysts with Soft X-ray Emission Spectrometer (SXES). Since titanium in the catalyst has various chemical bonds, it is important to grasp the chemical bond state.
Masayoshi Saito, Hiroshi Kashimura, Takuo Kataoka, Masahide Murata, Yusuke Sakuda, Hiroyuki Yamada, Hideyuki Takahashi   +6 more
doaj   +1 more source

Acetylene Semi‐Hydrogenation by Photocatalysis

Angewandte Chemie, Volume 138, Issue 40, 28 September 2026.
Photocatalytic acetylene semi‐hydrogenation is an emerging light‐driven route to polymer‐grade ethylene, offering a mild alternative to energy‐intensive thermocatalysis. By replacing H2 co‐feed with water or other proton sources, these systems can achieve high selectivity under ambient conditions.
Anna Fortunato, Brando Adranno, Sharon Silloni, Marianna Barbieri, Claudia Masia, Francesca Arcudi, Luka Đorđević   +6 more
wiley   +2 more sources

Electrified Acetylene Removal From Ethylene Streams Enabled by Facet‐Engineered Cu–TiO2 Interfaces

Angewandte Chemie International Edition, EarlyView.
Facet‐engineered interfaces enable selective electrochemical acetylene removal from ethylene streams. Dispersed Cu nanoclusters on the titania {001} facet suppress hydrogen and coupling byproducts, while stabilizing key hydrogenation intermediates.
Aocheng Hu, Zhen Liu, Laichun Zhao, Rui Guo, Qinjian Luo, Bufeng Zhang, Shuaijun Pan   +6 more
wiley   +1 more source

Industrial EP(D)M Rubber Production Process: a First-Principle Data-Driven Modelling Approach

Chemical Engineering Transactions, 2023
Ethylene-Propylene-(Diene) rubber is one of the most worldwide used polymers, employed in a large variety of applications. Versalis EP(D)M is produced by suspension copolymerization, without the use of solvent, initiated by metallorganic component ...
Franco Scaglia, Andrea Mazzini, Costantino Perretta, Giovanni Regattieri, Gianni Marchetti   +4 more
doaj   +1 more source

Geometry and local environment of surface sites in Vanadium-based Ziegler-Natta catalysts from 51V solid-state NMR Spectroscopy [PDF]

, 2023
Since its emergence over 50 years ago, the structure of surface sites in Ziegler-Natta catalysts, which are responsible for a major fraction of the world’s supply of polyethylene (PE) and polypropylene (PP), has remained elusive.
Sebastian, Sabisch, Scott R., Docherty, Alexander V., Yakimov, Christophe, Copéret, Yuya, Kakiuchi   +4 more
core   +2 more sources

Síntese de catalisadores Ziegler-Natta: algumas rotas e suas dificuldades Synthesis of Ziegler-Natta catalysts: some routes and their difficulties

Química Nova, 1997
The Ziegler-Natta catalyst and the polymerization thereof are systems which require careful handling and special treatment of chemicals. In spite of the use of inert atmosphere and dry chemicals, some Ziegler-Natta systems may present low activities or ...
Thaís H. S. Costa, Marcos A. S. Costa, Luiz Claudio de Santa Maria, Fernanda M. B. Coutinho, Neusa M. T. Pires   +4 more
doaj   +1 more source

Validation of BET Specific Surface Area for Heterogeneous Ziegler-Natta Catalysts based on α_S-plot [PDF]

, 2012
Specific surface area based on the BET method in N_2 adsorption has historically posed poor correlation with olefin polymerization activity of heterogeneous Ziegler-Natta (ZN) catalysts.
Taniike, Toshiaki, Terano, Minoru, Funako, Toshiki, Chammingkwan, Patchanee, Thang, Vu Quoc   +4 more
core   +1 more source

Electronic Structure, IR and UV-Vis Spectra of Some Suggested Ziegler-Natta Catalysts

Journal of Kufa-Physics, 2018
 Three aluminum metal complexes were suggested as Ziegler-Natta catalysts and studied theoretically at the ground and excited states. Becke’s three parameter exchange with Lee, Yang, and Parr correlation functional) density functional theory and SDD ...
Faeq A. AL-Temimeia, Hamid I. Abboodb
doaj   +1 more source