Super-assembled Carbon Nanofibers Decorated with Dual Catalytically Active Sites as Bifunctional Oxygen Catalysts for Rechargeable Zn-Air Batteries

2021 ◽  
pp. 100682
Author(s):  
Jinchao Cao ◽  
Hongyu Gong ◽  
Lei Xie ◽  
Yong Li ◽  
Na Zhang ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Active Sites ◽  
Catalytically Active

scholarly journals Manganese vacancy-confined single-atom Ag in cryptomelane nanorods for efficient Wacker oxidation of styrene derivatives

2021 ◽  
Author(s):  
Hongling Yang ◽  
Xun Zhang ◽  
Yi Yu ◽  
Zheng Chen ◽  
Qinggang Liu ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Active Sites ◽  
Single Atom ◽  
Wacker Oxidation ◽  
Catalytically Active ◽  
Styrene Derivatives

Single-atom catalysts provide a pathway to elucidate the nature of catalytically active sites. However, keeping them stabilized during operation proves to be challenging. Herein, we employ cryptomelane-type octahedral molecular sieve...

Tuning electronic states of catalytic sites enhances SCR activity of hexagonal WO3by Mo framework substitution

2017 ◽  
Vol 7 (12) ◽  
pp. 2467-2473 ◽  
Author(s):  
Yaxin Chen ◽  
Zichenxi Dong ◽  
Zhiwei Huang ◽  
Meijuan Zhou ◽  
Jiayi Gao ◽  
...  
Keyword(s):  
Active Sites ◽  
Electronic States ◽  
Catalytic Sites ◽  
Catalytically Active

The electronic states of the catalytically active sites of HWO were tuned by Mo framework substitution.

ChemInform Abstract: Catalytically Active Sites and Their Complexity: A Micro-review.

ChemInform ◽  
2014 ◽  
Vol 45 (11) ◽  
pp. no-no ◽  
Author(s):  
Marco Piumetti ◽  
Francesca Stefania Freyria ◽  
Barbara Bonelli
Keyword(s):  
Active Sites ◽  
Catalytically Active

Optimization of Catalytically Active Sites Positioning in Porous Cathodes of Lithium/Air Batteries Filled with Different Electrolytes

2015 ◽  
Vol 162 (14) ◽  
pp. A2796-A2804 ◽  
Author(s):  
Tatjana Dabrowski ◽  
Alexander Struck ◽  
Daniela Fenske ◽  
Peter Maaß ◽  
Lucio Colombi Ciacchi
Keyword(s):  
Active Sites ◽  
Catalytically Active ◽  
Porous Cathodes ◽  
Lithium Air Batteries

Identifying the catalytically active sites on the layered tri-chalcogenide compounds CoPS3 and NiPS3 for efficient hydrogen evolution reaction

2021 ◽  
Author(s):  
Khorsed Alam ◽  
Tisita Das ◽  
Sudip Chakraborty ◽  
Prasenjit Sen
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Density Functional ◽  
Electronic Structure Calculations ◽  
Functional Theory ◽  
Catalytically Active ◽  
Structure Calculations

Electronic structure calculations based on density functional theory are used to identify the catalytically active sites for the hydrogen evolution reaction on single layers of the two transition metal tri-chalcogenide...

scholarly journals Microkinetic Modeling of the Oxidation of Methane Over PdO Catalysts—Towards a Better Understanding of the Water Inhibition Effect

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 922
Author(s):  
Kevin Keller ◽  
Patrick Lott ◽  
Henning Stotz ◽  
Lubow Maier ◽  
Olaf Deutschmann
Keyword(s):  
Active Sites ◽  
Catalyst Deactivation ◽  
Field Approximation ◽  
Mean Field Approximation ◽  
Excess Oxygen ◽  
Total Oxidation ◽  
Kinetic Measurements ◽  
Microkinetic Model ◽  
Oxidation Of Methane ◽  
Catalytically Active

Water, which is an intrinsic part of the exhaust gas of combustion engines, strongly inhibits the methane oxidation reaction over palladium oxide-based catalysts under lean conditions and leads to severe catalyst deactivation. In this combined experimental and modeling work, we approach this challenge with kinetic measurements in flow reactors and a microkinetic model, respectively. We propose a mechanism that takes the instantaneous impact of water on the noble metal particles into account. The dual site microkinetic model is based on the mean-field approximation and consists of 39 reversible surface reactions among 23 surface species, 15 related to Pd-sites, and eight associated with the oxide. A variable number of available catalytically active sites is used to describe light-off activity tests as well as spatially resolved concentration profiles. The total oxidation of methane is studied at atmospheric pressure, with space velocities of 160,000 h−1 in the temperature range of 500–800 K for mixtures of methane in the presence of excess oxygen and up to 15% water, which are typical conditions occurring in the exhaust of lean-operated natural gas engines. The new approach presented is also of interest for modeling catalytic reactors showing a dynamic behavior of the catalytically active particles in general.

scholarly journals Energy Efficient and Intermittently Variable Ammonia Synthesis over Mesoporous Carbon-Supported Cs-Ru Nanocatalysts

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 406 ◽  
Author(s):  
Masayasu Nishi ◽  
Shih-Yuan Chen ◽  
Hideyuki Takagi
Keyword(s):  
Activated Carbon ◽  
Mesoporous Carbon ◽  
Active Sites ◽  
Carbon Materials ◽  
Ammonia Synthesis ◽  
Molar Ratios ◽  
Free Hydrogen ◽  
Catalytically Active ◽  
Ru Species ◽  
Mesoporous Carbon Materials

The Cs-promoted Ru nanocatalysts supported on mesoporous carbon materials (denoted as Cs-Ru/MPC) and microporous activated carbon materials (denoted as Cs-Ru/AC) were prepared for the sustainable synthesis of ammonia under mild reaction conditions (<500 °C, 1 MPa). Both Ru and Cs species were homogeneously impregnated into the mesostructures of three commercial available mesoporous carbon materials annealed at 1500, 1800 and 2100 °C (termed MPC-15, MPC-18 and MPC-21, respectively), resulting in a series of Cs-Ru/MPC catalysts with Ru loadings of 2.5–10 wt % and a fixed Cs loading of 33 wt %, corresponding to Cs/Ru molar ratios of 2.5–10. However, the Ru and Cs species are larger than the pore mouths of microporous activated carbon (shortly termed AC) and, as a consequence, were mostly aggregated on the outer surface of the Cs-Ru/AC catalysts. The Cs-Ru/MPC catalysts are superior to the Cs-Ru/AC catalyst in catalysing mild ammonia synthesis, especially for the 2.5Cs-10Ru/MPC-18 catalyst with a Ru loading of 10 wt % and a Cs/Ru ratio of 2.5, which exhibited the highest activity across a wide SV range. It also showed an excellent response and stability during cycling tests over a severe temperature jump in a short time, presumably due to the open mesoporous carbon framework and suitable surface concentrations of CsOH and metallic Ru species at the catalytically active sites. This 2.5Cs-10Ru/MPC-18 catalyst with high activity, fast responsibility and good stability has potential application in intermittently variable ammonia synthesis using CO2-free hydrogen derived from electrolysis of water using renewable energy with fast variability.

Carbon nanotube aerogel–CoS2 hybrid catalytic counter electrodes for enhanced photovoltaic performance dye-sensitized solar cells

Nanoscale ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 4194-4201 ◽  
Author(s):  
Tao Liu ◽  
Xianmin Mai ◽  
Haijun Chen ◽  
Jing Ren ◽  
Zheting Liu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Active Sites ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Ion Diffusion ◽  
Counter Electrodes ◽  
Dye Sensitized ◽  
Catalytically Active ◽  
Sensitized Solar Cells

Owing to the large number of catalytically active sites and sufficient connections between CoS2 and a CNA, a CNA–CoS2 CE exhibited a higher electrocatalytic activity, and faster ion diffusion and electron transfer than a CNA CE.

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