نتایج جستجو برای: molecular catalyst

تعداد نتایج: 676548  

2013
Yasushi Obora

In this review, we summarize recent progress from our group with regard to Pd-catalyzed oxidative amination of alkenes with amines. Intermolecular oxidative amination of alkenes with secondary anilines was induced using a palladium-complex catalyst combined with molybdovanadophosphate as a co-catalyst under dioxygen, leading to allylic amines and enamines in good yields with high selectivities....

Journal: :Chemical communications 2016
Masanori Yamamoto Yusuke Nishizawa Pavel Chábera Fusheng Li Torbjörn Pascher Villy Sundström Licheng Sun Hiroshi Imahori

A new subporphyrin was synthesized for use as a molecular sensitizer in electrochemical and dye-sensitized photoelectrochemical water oxidation. A photoelectrochemical cell with a TiO2 electrode modified with the sensitizer and a molecular water oxidation catalyst generated higher photocurrent than reference cells that have electrodes modified with either the photosensitizer or the catalyst und...

Journal: :Chemical communications 2009
Agostino Pietrangelo Marc A Hillmyer William B Tolman

Indium trichloride, benzyl alcohol, and triethylamine (without an added 'directing' multidentate ligand) generate a catalyst in situ for the room temperature polymerization of D,L-lactide affording highly heterotactic polylactide of controlled molecular weight and narrow molecular weight distribution.

Journal: Polyolefins Journal 2018

SiO2/MgCl2 (ethoxide type)/TiCl4 Ziegler-Natta catalysts for use in ethylene polymerization and ethylene/1-hexene copolymerization have been prepared using silica with a supported layer of magnesium ethoxide (Mg(OEt)2) as a catalyst precursor, followed by treating with TiCl4 at different Ti/Mg molar ratios, which showed significant effects on the active centers and pore structures of the cataly...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2012
Ye Zhang Ning Li Jorge Delgado Yuan Gao Yi Kuang Seth Fraden Irving R Epstein Bing Xu

After a polymerizable hydrogelator self-assembles in water to form molecular nanofibers, post-self-assembly cross-linking allows the catalyst of the Belousov-Zhabotinsky (BZ) reaction to be attached to the nanofibers, resulting in a hydrogel that exhibits concentration oscillations, spiral waves, and concentric waves. In addition to the first report of the observation of BZ spiral waves in a hy...

2017
Bertrand Reuillard Khoa H Ly Timothy E Rosser Moritz F Kuehnel Ingo Zebger Erwin Reisner

The development of high-performance electrocatalytic systems for the controlled reduction of CO2 to value-added chemicals is a key goal in emerging renewable energy technologies. The lack of selective and scalable catalysts in aqueous solution currently hampers the implementation of such a process. Here, the assembly of a [MnBr(2,2'-bipyridine)(CO)3] complex anchored to a carbon nanotube electr...

2017
Souvik Roy Vlad Pascanu Sonja Pullen Greco González Miera Belén Martín-Matute Sascha Ott

A molecular H2-evolving catalyst, [Fe2(cbdt)(CO)6] ([FeFe], cbdt = 3-carboxybenzene-1,2-dithiolate), has been attached covalently to an amino-functionalized MIL-101(Cr) through an amide bond. Chemical reduction experiments reveal that the MOF channels can be clogged by ion pairs that are formed between the oxidized reductant and the reduced catalyst. This effect is lessened in MIL-101-NH-[FeFe]...

Journal: :Journal of the American Chemical Society 2013
James D Blakemore Ayush Gupta Jeffrey J Warren Bruce S Brunschwig Harry B Gray

We show that molecular catalysts for fuel-forming reactions can be immobilized on graphitic carbon electrode surfaces via noncovalent interactions. A pyrene-appended bipyridine ligand (P) serves as the linker between each complex and the surface. Immobilization of a rhodium proton-reduction catalyst, [Cp*Rh(P)Cl]Cl (1), and a rhenium CO2-reduction catalyst, Re(P)(CO)3Cl (2), afford electrocatal...

2003
Daniel A. Fischer Kirill Efimenko Rajendra R. Bhat Sharadha Sambasivan Jan Genzer

The demands of preparing, processing, and characterizing novel materials and structures, and the need for full exploration of the typically broad parameter space has led to the development of a plethora of novel combinatorial approaches.Most experimental combinatorialmethods concentrate on probing only a singlematerial property, such as chemical information, topography, etc. For some applicatio...

2005
Frank Friedel Frank Janowski Thomas Hahn Dirk Enke

1. Introduction Porous solids with bimodal pore structures are widely used as catalyst supports. Examples are formed bodies, such as tablets, beads, extrudates, and monoliths, of molecular sieves, silica and alumina. The formed bodies are prepared usually by compacting fine micro-or mesoporous particles [1]. As a result, macropores are formed between the agglomerated particles. Recently, cataly...

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