نتایج جستجو برای: co momgo catalyst

تعداد نتایج: 371725  

Journal: :Journal of the American Chemical Society 2015
Hyun S Ahn Allen J Bard

Despite exhaustive spectroscopic investigations on the CoPi oxygen-evolving catalyst over the past several years, little is known about the surface cobalt sites and intermediates in direct contact with water that are responsible for the actual catalysis. Many studies thus far have been limited to ex situ characterizations or bulk film measurements, often in the absence of solvent. Here we descr...

Journal: :Physical chemistry chemical physics : PCCP 2013
Daniel Friebel Michal Bajdich Boon Siang Yeo Mary W Louie Daniel J Miller Hernan Sanchez Casalongue Felix Mbuga Tsu-Chien Weng Dennis Nordlund Dimosthenis Sokaras Roberto Alonso-Mori Alexis T Bell Anders Nilsson

Resonant inelastic X-ray scattering and high-resolution X-ray absorption spectroscopy were used to identify the chemical state of a Co electrocatalyst in situ during the oxygen evolution reaction. After anodic electrodeposition onto Au(111) from a Co(2+)-containing electrolyte, the chemical environment of Co can be identified to be almost identical to CoOOH. With increasing potentials, a subtle...

In this paper, LaBO3 perovskite type catalyst formulations were prepared by sol-gel auto combustion method using citric acid as the fuel. Activity of catalysts was tested in catalytic oxidation of toluene as a model of volatile organic compounds. LaCoO3 perovskite formulation showed the highest activity among LaBO3 (Fe, Mn and Co) perovskite catalysts. So, LaCoO3 perovskite based catalyst was s...

2003
Corrado Crotti Sergio Cenini Roberto Todeschini

A chemometric optimization of the Ru,(CO), catalysed deoxygenation of 2-nitrostilbene to 2-phenylindole was carried out. The effects of temperature, CO pressure, amounts of catalyst and substrate on conversion and selectivity were examined by factorial design/response surface methods. The conversion was found to increase on increasing the temperature and decreasing the CO pressure, it assumed a...

Journal: :Journal of environmental sciences 2008
Xiaoyan Shi Yunbo Yu Hong He Shijin Shuai Hongyi Dong Rulong Li

In this study, the efforts to reduce NOx and particulate matter (PM) emissions from a diesel engine using both ethanol-selective catalytic reduction (SCR) of NOx over an Ag/Al2O3 catalyst and a biodiesel-ethanol-diesel fuel blend (BE-diesel) on an engine bench test are discussed. Compared with diesel fuel, use of BE-diesel increased PM emissions by 14% due to the increase in the soluble organic...

Journal: :Chemical communications 2008
Zili Wu Shenghu Zhou Haoguo Zhu Sheng Dai Steven H Overbury

An unexpected oxygen-assisted reduction of cationic Au species by CO was found on a Au/SiO(2) catalyst at room temperature and the produced metallic Au species plays an essential role in CO oxidation on Au/SiO(2).

Journal: :Journal of the American Chemical Society 2017
Mohamed Abdellah Ahmed M El-Zohry Liisa J Antila Christopher D Windle Erwin Reisner Leif Hammarström

Attaching the phosphonated molecular catalyst [ReIBr(bpy)(CO)3]0 to the wide-bandgap semiconductor TiO2 strongly enhances the rate of visible-light-driven reduction of CO2 to CO in dimethylformamide with triethanolamine (TEOA) as sacrificial electron donor. Herein, we show by transient mid-IR spectroscopy that the mechanism of catalyst photoreduction is initiated by ultrafast electron injection...

Journal: :Chemical communications 2015
Yushi Nakamura Tetsuo Ohta Yohei Oe

A formal anti-Markovnikov hydroamination of allylic alcohols using a Ru catalyst via tandem oxidation/1,4-conjugate addition/1,2-reduction was developed. Thus, the reaction of allylic alcohols with amines was performed in the presence of the catalyst generated from RuClH(CO)(PPh3)3 and 2,6-bis(n-butyliminomethyl)pyridine in situ to afford the corresponding γ-amino alcohols efficiently.

2005
M. Ali Akcayol Can Cinar

Catalytic converters are the most effective means of reducing pollutant emissions from internal combustion engines under normal operating conditions. But the future emission requirements cannot be met by three way catalysts (TWC) as they cannot effectively remove hydrocarbon (HC) and carbon monoxide (CO) emissions from the outlet of internal combustion engines in the cold-start phase. Therefore...

2017
Paul J. Smith Simon A. Kondrat Philip A. Chater Benjamin R. Yeo Greg M. Shaw Li Lu Jonathan K. Bartley Stuart H. Taylor Michael S. Spencer Christopher J. Kiely Gordon J. Kelly Colin W. Park Graham J. Hutchings

Zincian georgeite, an amorphous copper–zinc hydroxycarbonate, has been prepared by co-precipitation using acetate salts and ammonium carbonate. Incorporation of zinc into the georgeite phase and mild ageing conditions inhibits crystallisation into zincian malachite or aurichalcite. This zincian georgeite precursor was used to prepare a Cu/ZnO catalyst, which exhibits a superior performance to a...

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