scholarly journals Liquid‐Phase Cyclohexene Oxidation with O2 over Spray‐Flame‐Synthesized La1‐xSrxCoO3 Perovskite Nanoparticles

Author(s):  
Julia Büker ◽  
Baris Alkan ◽  
Sonia Chabbra ◽  
Nikolai Kochetov ◽  
Tobias Falk ◽  
...  
2020 ◽  
Vol 10 (15) ◽  
pp. 5196-5206 ◽  
Author(s):  
Julia Büker ◽  
Baris Alkan ◽  
Qi Fu ◽  
Wei Xia ◽  
Jonas Schulwitz ◽  
...  

A series of spray-flame made LaCo1−xFexO3 nanoparticles showed promising activity for liquid-phase cyclohexene oxidation. Various oxidizing agents, i.e., O2, H2O2 and tert-butyl hydroperoxide, led to different product selectivities.


Author(s):  
S. K. Aggarwal ◽  
S. Chitre

Computations are reported on the detailed structures of unconfined turbulent combusting sprays. Favre-averaged gas-phase equations are used and a k-ε-g turbulence closure model is utilized. Using a conserved scalar approach and assuming the form of probability density function to be a clipped Gaussian, the thermodynamic scalar variables are calculated from a partial equilibrium model. The major features of the liquid-phase model are that a stochastic random-walk approach is used to represent the effect of gas-phase turbulence on droplet trajectory and vaporization, the variable-property effects are considered in a comprehensive manner, and a conduction-limit mode is employed to represent the transient liquid-phase processes. This two-phase model is used to study the structure of an unconfined methanol spray flame. Important observation is that the turbulent spray flame structure is significantly different, both quantitatively and qualitatively, from that of the corresponding gaseous diffusion flame. In addition, the spray flame exhibits a strong sensitively to the transient liquid-phase processes. The latter result is interesting since, in an earlier computational study for an evaporating spray, the vaporization behavior for the same liquid fuel indicated only a weak sensitivity to these processes.


2020 ◽  
Vol 7 (12) ◽  
pp. 2564-2574 ◽  
Author(s):  
Baris Alkan ◽  
Danea Medina ◽  
Joachim Landers ◽  
Markus Heidelmann ◽  
Ulrich Hagemann ◽  
...  

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63382-63392 ◽  
Author(s):  
Sanaa El-Korso ◽  
Sumeya Bedrane ◽  
Abderrahim Choukchou-Braham ◽  
Redouane Bachir

In the presence of redox catalysts, cyclohexene oxidation leads to an epoxidation product, while in the presence of acidic features; the allylic oxidation is predominant and leads to cyclohexenol and cyclohexenone.


2019 ◽  
Vol 6 (16) ◽  
pp. 4266-4274 ◽  
Author(s):  
Baris Alkan ◽  
Steffen Cychy ◽  
Swapnil Varhade ◽  
Martin Muhler ◽  
Christof Schulz ◽  
...  

2014 ◽  
Vol 394 ◽  
pp. 89-96 ◽  
Author(s):  
Sanaa El-Korso ◽  
Ilyes Khaldi ◽  
Sumeya Bedrane ◽  
Abderrahim Choukchou-Braham ◽  
Frédéric Thibault-Starzyk ◽  
...  

Author(s):  
N.V. Belov ◽  
U.I. Papiashwili ◽  
B.E. Yudovich

It has been almost universally adopted that dissolution of solids proceeds with development of uniform, continuous frontiers of reaction.However this point of view is doubtful / 1 /. E.g. we have proved the active role of the block (grain) boundaries in the main phases of cement, these boundaries being the areas of hydrate phases' nucleation / 2 /. It has brought to the supposition that the dissolution frontier of cement particles in water is discrete. It seems also probable that the dissolution proceeds through the channels, which serve both for the liquid phase movement and for the drainage of the incongruant solution products. These channels can be appeared along the block boundaries.In order to demonsrate it, we have offered the method of phase-contrast impregnation of the hardened cement paste with the solution of methyl metacrylahe and benzoyl peroxide. The viscosity of this solution is equal to that of water.


Author(s):  
C.D. Humphrey ◽  
T.L. Cromeans ◽  
E.H. Cook ◽  
D.W. Bradley

There is a variety of methods available for the rapid detection and identification of viruses by electron microscopy as described in several reviews. The predominant techniques are classified as direct electron microscopy (DEM), immune electron microscopy (IEM), liquid phase immune electron microscopy (LPIEM) and solid phase immune electron microscopy (SPIEM). Each technique has inherent strengths and weaknesses. However, in recent years, the most progress for identifying viruses has been realized by the utilization of SPIEM.


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