نتایج جستجو برای: cu based catalyst

تعداد نتایج: 3021400  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Hai Xiao William A Goddard Tao Cheng Yuanyue Liu

We propose and validate with quantum mechanics methods a unique catalyst for electrochemical reduction of CO2 (CO2RR) in which selectivity and activity of CO and C2 products are both enhanced at the borders of oxidized and metallic surface regions. This Cu metal embedded in oxidized matrix (MEOM) catalyst is consistent with observations that Cu2O-based electrodes improve performance. However, w...

Journal: :Dalton transactions 2015
Wei-Bin Yu Qing-Ya He Xiu-Fang Ma Hua-Tian Shi Xianwen Wei

A new azo-complex [(L)Cu(II)(NO3)] [L = (E)-3-(pyridin-2-yldiazenyl)naphthalen-2-ol (HL)], was prepared via a one-pot synthetic method at 60 °C and was structurally characterized by IR, EA, PXRD and single crystal X-ray diffraction. In addition, TGA studies indicated that the complex was stable in air. The redox properties were determined by cyclic voltammetry, which revealed that the complex c...

Journal: :IOP Conference Series: Earth and Environmental Science 2020

2011
Wanyu Mao Qiwen Sun Weiyong Ying Dingye Fang

The influence of copper promoters and reaction conditions on the formation of alcohols byproducts of a common Fischer-Tropsch synthesis used iron-based catalysts were investigated. A good compromise of 28%Cu/FeKLaSiO2 can lead to the optimization of an improved Fischer-Tropsch catalyst. The product distribution shifts towards hydrocarbons with increasing the reaction temperature, while pressure...

2013
Szabolcs Harnos György Onyestyák Dénes Kalló

Octanoic acid (OA) was used as reactant with medium chain length to model the aliphatic carboxylic acids which can be produced by catalytic, thermochemical or biological degradation of biomass. A flow through reactor was applied at 21 bar total pressure (in general at 20 bar hydrogen and 1 bar octanoic acid partial pressures) and 330-380 °C. Cu A-, Xand Y-zeolite based catalysts were pretreated...

2014
Lijiao Hu Yang Ju Atsushi Hosoi

UNLABELLED Cu2O grass-like and ZnO flower-like nanoarchitectures were fabricated directly on Cu powders and Zn powders using a novel thermal oxidation stress-induced (TOS) method based on catalyst assistance at a low temperature of 150°C under moderate humid atmosphere. The experiments of Al powder were also carried out based on TOS method. Overlapping migration (OLM) of Cu and Zn atoms and too...

Journal: :Chemical communications 2015
Erica Benedetti Nicolas Duchemin Lucas Bethge Stefan Vonhoff Sven Klussmann Jean-Jacques Vasseur Janine Cossy Michael Smietana Stellios Arseniyadis

The challenge in DNA-based asymmetric catalysis is to perform a reaction in the vicinity of the helix by incorporating a small-molecule catalyst anchored to the DNA in a covalent, dative, or non-covalent yet stable fashion in order to ensure high levels of enantio-discrimination. Here, we report the first generation of a DNA-based catalyst bound to a cellulose matrix. The chiral biomaterial is ...

2017
Dariush Ranjbar Vakilabadi Bahman Ramavandi Amir Hessam Hassani Ghasemali Omrani

Landfill leachate contains heavy organic pollutants, which pollute ground and surface waters. This dataset applied a newly-introduced catalyst, Cu/Mg/Al-chitosan, for a landfill leachate treatment during a catalytic oxidation. The data of chemical oxygen demand (COD) and colour removal from the leachate was reported as a function of reaction time (20-460 min). Economic evaluation data of the Cu...

Journal: :Chemical communications 2006
Fernando López Anthoni W van Zijl Adriaan J Minnaard Ben L Feringa

A catalyst system able to perform highly enantioselective Cu-catalysed allylic alkylations with Grignard reagents is described.

Journal: :Journal of the American Chemical Society 2008
J Brian Hewgley Shannon S Stahl Marisa C Kozlowski

Copper(I) and copper(II) 1,5-diaza-cis-decalin complexes [(N2)Cu] are effective precatalysts for aerobic oxidative coupling of naphthol substrates. Mechanistic studies, however, reveal that these complexes are not the reactive form of the catalyst under steady-state conditions. Rather, the active catalyst forms in a presteady-state self-processing step that involves oxygenation of the naphthol ...

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