scholarly journals DETAILED ANALYSIS OF AN ENDOREVERSIBLE FUEL CELL : MAXIMUM POWER AND OPTIMAL OPERATING TEMPERATURE DETERMINATION

2012 ◽  
Vol 3 (3) ◽  
Author(s):  
Alexandre Vaudrey ◽  
Philippe Baucour ◽  
François Lanzetta ◽  
Raynal Glises
Keyword(s):  
Fuel Cell ◽  
Detailed Analysis ◽  
Operating Temperature ◽  
Maximum Power ◽  
Optimal Operating ◽  
Temperature Determination ◽  
Optimal Operating Temperature

Simulation of direct chlorination of ethylene in a two-phase reactor by coupling equilibrium, kinetic and population balance models

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Z. Moradi ◽  
M. Farsi
Keyword(s):  
Mass Transfer ◽  
Steady State ◽  
Production Rate ◽  
Operating Temperature ◽  
Population Balance ◽  
State Condition ◽  
Operating Pressure ◽  
Optimal Operating ◽  
Steady State Condition ◽  
Optimal Operating Temperature

AbstractThe purpose of presented research is the mathematical simulation and sensitivity analysis of ethylene dichloride synthesis (EDC) through direct chlorination of ethylene in a bubble column reactor at steady state condition. In the first step, the reactor is heterogeneously simulated based on the energy and mass balance equations by coupling the mass and energy, kinetic, equilibrium, and population balance models. In the considered process, the gaseous ethylene and chlorine are dispersed and dissolved in the liquid medium and converted to EDC at the presence of a homogeneous catalyst. The population balance model is applied to calculate the heat and mass transfer area along the reactor. To investigate the accuracy of established model, the results of simulation are compared with the plant data. It is confirmed that temperature, pressure, rate of mass transfer, breakage, and coalescence phenomena change the bubble diameter and distribution in the chlorination reactor. In the second step, the effects of operating pressure and temperature on the EDC production rate are investigated by the developed model. In the third step, considering EDC production rate as the cost function the optimal operating temperature of reactor is developed at steady state condition. Based on the obtained results, the optimal operating temperature is 357 K and EDC production at the optimal condition is 23.79 mol s−1.

Synthesis of Au Nanoparticles Functionalized 1D α-MoO3 Nanobelts and Their Gas Sensing Properties

NANO ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. 1850115 ◽  
Author(s):  
Liwei Wang ◽  
Shaopeng Wang ◽  
Hao Fu ◽  
Yinghui Wang ◽  
Kefu Yu
Keyword(s):  
Electron Microscope ◽  
Au Nanoparticles ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Molecular Probe ◽  
Optimal Operating ◽  
Au Nps ◽  
X Ray ◽  
Sensing Properties ◽  
Optimal Operating Temperature

A novel sensor material of Au nanoparticles (NPs) functionalized 1D [Formula: see text]-MoO3 nanobelts (NBs) was fabricated by a facile lysine-assisted approach. The obtained Au/[Formula: see text]-MoO3 product was characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray (EDX), and X-ray photoelectron spectra (XPS). Then, in order to investigate the gas sensing performances of our samples, a comparative gas sensing study was carried out on both the [Formula: see text]-MoO3 NBs before and after Au NPs decoration by using ethanol vapor as the molecular probe. The results turned out that, after the functionalization of Au NPs, the sensor exhibited improved gas-sensing characteristics than the pure [Formula: see text]-MoO3, such as response and recovery time, optimal operating temperature (OT) and excellent selectivity. Take for example 200[Formula: see text]ppm of ethanol, the response/recovery times were 34[Formula: see text]s/43[Formula: see text]s and 5.7[Formula: see text]s/10.5[Formula: see text]s, respectively, while the optimal operating temperature (OT) was lower to 200[Formula: see text]C rather than 250[Formula: see text]C. Besides, the functionalized sensor showed a higher response to ethanol at 200[Formula: see text]C, and response was 1.6 times higher than the pure MoO3. The mechanism of such improved sensing properties was interpreted, which might be attributed to the spillover effect of Au NPs and the electronic metal-support interaction.

Highly sensitive SnO2 nanofiber chemiresistors with a low optimal operating temperature: synergistic effect of Cu2+/Au co-doping

2014 ◽  
Vol 2 (33) ◽  
pp. 13655-13660 ◽  
Author(s):  
Zhenyu Li ◽  
Xungai Wang ◽  
Tong Lin
Keyword(s):  
Synergistic Effect ◽  
Operating Temperature ◽  
Optimal Operating ◽  
Optimal Operating Temperature ◽  
Co Doping ◽  
Highly Sensitive ◽  
Sno2 Nanofiber ◽  
Co Doped

SnO2 nanofibers after being co-doped with Cu2+ and Au show considerably enhanced sensing performances at an unexpectedly decreased operating temperature and a synergistic effect occurs when the two dopants are introduced together.

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