scholarly journals Preparation of barium titanate powders by microwave-assisted liquid phase process at ambient pressure

2009 ◽  
Vol 117 (1363) ◽  
pp. 388-391 ◽  
Author(s):  
Ryo MATOBA ◽  
Yamato HAYASHI ◽  
Hirotsugu TAKIZAWA
Keyword(s):  
Liquid Phase ◽  
Barium Titanate ◽  
Ambient Pressure ◽  
Microwave Assisted ◽  
Phase Process

scholarly journals Turnover Rate of Metal-Catalyzed Hydroconversion of 2,5-Dimethylfuran: Gas-Phase Versus Liquid-Phase

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1171
Author(s):  
Hanan Althikrallah ◽  
Casper Kunstmann-Olsen ◽  
Elena F. Kozhevnikova ◽  
Ivan V. Kozhevnikov
Keyword(s):  
Liquid Phase ◽  
Gas Phase ◽  
Furan Ring ◽  
Ambient Pressure ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Ring Cleavage ◽  
Phase Reaction ◽  
Liquid Phase Reaction ◽  
Phase Process

Hydroconversion (hydrogenation and hydrogenolysis) of biomass-derived furanic compounds giving furan ring-hydrogenation and ring-cleavage products attracts interest for sustainable production of chemicals and fuels. Here, the hydroconversion of 2,5-dimethylfuran (DMF), chosen as a model furanic compound, was investigated at a gas-solid interface over carbon-supported Pt, Pd, Rh and Ru metal catalysts in a fixed-bed reactor at 70–90 °C and ambient pressure. Pt/C was mainly active in ring cleavage of DMF to produce 2-hexanone as the primary product, followed by its hydrogenation to 2-hexanol and hexane. In contrast, Pd/C, Rh/C and Ru/C selectively hydrogenated the furan ring to 2,5-dimethyltetrahydrofuran (DMTHF). The turnover frequency (TOF) of metal sites in the gas-phase DMF hydroconversion was determined from zero-order kinetics in the absence of diffusion limitations. The TOF values decreased in the sequence Pt > Rh > Pd >> Ru, similar to the liquid-phase reaction. The TOF values for the gas-phase reaction were found to be one order of magnitude greater than those for the liquid-phase reaction. This indicates that the gas-phase process is potentially more efficient than the liquid-phase process. TOF values for hydroconversion of ring-saturated furan derivatives, tetrahydrofuran and DMTHF, on Pt/C, were much lower than those for DMF.

Formation Mechanism of LiFePO4 Sticks Grown by a Microwave-Assisted Liquid-Phase Process

Small ◽  
2012 ◽  
Vol 8 (14) ◽  
pp. 2231-2238 ◽  
Author(s):  
Daniel Carriazo ◽  
Marta D. Rossell ◽  
Guobo Zeng ◽  
Idalia Bilecka ◽  
Rolf Erni ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Formation Mechanism ◽  
Microwave Assisted ◽  
Phase Process

scholarly journals Fuel spray vapour distribution correlations for a high pressure diesel fuel spray cases for different injector nozzle geometries.

2017 ◽  
Author(s):  
Darlington Njere ◽  
Nwabueze Emekwuru
Keyword(s):  
High Pressure ◽  
Liquid Phase ◽  
Diesel Fuel ◽  
Ambient Pressure ◽  
Vapour Phase ◽  
Fuel Spray ◽  
Combustion Chambers ◽  
Complete Combustion ◽  
Fuel Injectors ◽  
Fuel Vapour

The evolution of diesel fuel injection technology, to facilitate strong correlations of in-cylinder spray propagation with injection conditions and injector geometry, is crucial in facing emission challenges. More observations of spray propagation are, therefore, required to provide valuable information on how to ensure that all the injected fuel has maximum contact with the available air, to promote complete combustion and reduce emissions. In this study, high pressure diesel fuel sprays are injected into a constant-volume chamber at injection and ambient pressure values typical of current diesel engines. For these types of sprays the maximum fuel liquid phase penetration is different and reached sooner than the maximum fuel vapour phase penetration. Thus, the vapour fuel could reach the combustion chamber wall and could be convected and deflected by swirling air. In hot combustion chambers this impingement can be acceptable but this might be less so in larger combustion chambers with cold walls. The fuel-ambient mixture in vapourized fuel spray jets is essential to the efficient performance of these engines. For this work, the fuel vapour penetration values are presented for fuel injectors of different k-factors. The results indicate that the geometry of fuel injectors based on the k-factors appear to affect the vapour phase penetration more than the liquid phase penetration. This is a consequence of the effects of the injector types on the exit velocity of the fuel droplets.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4951

ChemInform Abstract: Microwave-Assisted Solid-Liquid Phase Alkylation of Naphthols.

ChemInform ◽  
2013 ◽  
Vol 44 (46) ◽  
pp. no-no
Author(s):  
Erika Balint ◽  
Orsolya Kovacs ◽  
Laszlo Drahos ◽  
Gyoergy Keglevich
Keyword(s):  
Liquid Phase ◽  
Microwave Assisted ◽  
Solid Liquid
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