Hydrodynamics, mass transfer, and photocatalytic phenol selective oxidation reaction kinetics in a fixed TiO2microreactor

AIChE Journal ◽  
2014 ◽  
Vol 61 (2) ◽  
pp. 572-581 ◽  
Author(s):  
Matic Krivec ◽  
Andrej Pohar ◽  
Blaž Likozar ◽  
Goran Dražić
Keyword(s):  
Mass Transfer ◽  
Reaction Kinetics ◽  
Selective Oxidation ◽  
Oxidation Reaction

Impact Of Synthesis Route on the Water Oxidation Kinetics of Hematite Photoanodes

2020 ◽  
Author(s):  
Camilo A. Mesa ◽  
Ludmilla Steier ◽  
Benjamin Moss ◽  
Laia Francàs ◽  
James E. Thorne ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Reaction Kinetics ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Oxidation Reaction ◽  
Charge Accumulation ◽  
Optical Signals ◽  
Current Voltage ◽  
Voltage Performance ◽  
Kinetics Of

<p><i>Operando</i> spectroelectrochemical analysis is used to determine the water oxidation reaction kinetics for hematite photoanodes prepared using four different synthetic procedures. Whilst these photoanodes exhibit very different current / voltage performance, their underlying water oxidation kinetics are found to be almost invariant. Lower photoanode performance was found to correlate with the observation of optical signals indicative of charge accumulation in mid-gap oxygen vacancy states, indicating these states do not contribute directly to water oxidation.</p>

Mono-Atomic Fe Centers in Nitrogen/Carbon Monolayers for Liquid-Phase Selective Oxidation Reaction

ChemCatChem ◽  
2018 ◽  
Vol 10 (16) ◽  
pp. 3539-3545 ◽  
Author(s):  
Li-Bing Lv ◽  
Shi-Ze Yang ◽  
Wen-Yu Ke ◽  
Hong-Hui Wang ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Selective Oxidation ◽  
Oxidation Reaction

CFD Simulation of the Particle Dispersion Behavior and Mass Transfer–Reaction Kinetics in non-Newton Fluid with High Viscosity

2019 ◽  
Vol 17 (7) ◽  
Author(s):  
Le Xie ◽  
Qi-An Wang ◽  
Xian-Jin Luo ◽  
Zheng-Hong Luo
Keyword(s):  
Mass Transfer ◽  
Reaction Kinetics ◽  
Transfer Reaction ◽  
High Viscosity ◽  
Particle Dispersion ◽  
Agitation Speed ◽  
Fluid Viscosity ◽  
Condensation Polymerization ◽  
Cross Model ◽  
Dispersion Behavior

Abstract Solid particle dispersion and chemical reactions in high-viscosity non-Newtonian fluid are commonly encountered in polymerization systems. In this study, an interphase mass transfer model and a finite-rate/eddy-dissipation formulation were integrated into a computational fluid dynamics model to simulate the dispersion behavior of particles and the mass transfer–reaction kinetics in a condensation polymerization-stirred tank reactor. Turbulence fields were obtained using the standard k–ε model and employed to calculate the mixing rate. Cross model was used to characterize the rheological property of the non-Newton fluid. The proposed model was first validated by experimental data in terms of input power. Then, several key operating variables (i.e. agitation speed, viscosity, and particle size) were investigated to evaluate the dispersive mixing performance of the stirred vessel. Simulation showed that a high agitation speed and a low fluid viscosity favored particle dispersions. This study provided useful guidelines for industrial-scale high-viscosity polymerization reactors.

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