A PEM fuel cell assembly requires the simultaneous delivery of reactants to the electrodes of multiple cells in order to produce electrical power. The mass transport of reactants to the electrode surfaces is complicated by the presence of liquid water during operation in low temperature ...
The rate of liquid-phase chemical reactions involving transfer of reactants from another phase depends on the homogeneous liquid-phase kinetics, physical mass transfer rates of reactants, and their thermodynamic equilibria at the phase b... AW Gessner - Homogeneous Catalysis 被引量: 8发表: 1974...
Reactants (mass) move within the flow structure in order to react with other species and thereby form the products, both desirable and undesirable. This movement in mass occurs either by diffusion or by turbulent dispersion. In a similar fashion, heat is transferred from one point in the ...
(17.9)1βov,2=eJw(1/kd)B+1Jw[eJw(1/kd+S/D+1/kf)−1]. This resistance-in-series model enables the user to express separately the interface concentrations, while the literature model expresses the concentration difference of the transport layers only. Let the interface concentrations be ex...
The diffusion of reactants and products in and out of the interior of the photocatalyst particle. • The light penetration inside the photocatalyst volume. Generally, the internal mass transfer occurs in porous materials and depends on the intrinsic properties of the catalyst [31]. In this rega...
In metal extraction and refining, the chemical changes are usually associated with the transport of the reactants to the reaction sites and the transport of products away from the reaction site. The overall rates of the processes are often mass transfer-controlled, because the chemical kinetics ...
Effect of Fenton-like oxidation on enhanced oxidative degradation of para-chlorobenzoic acid by ultrasonic irradiation FeOOH surfaces by acoustic cavitation and the accelerated mass transport rates of reactants and products between the solution phase and the FeOOH surface... PH Choi - 《Ultrasonics...
The model can be used to study the sensitivity of the reaction rate towards the initial charge composition (PTC, organic/aqueous phase reactants, base, salt, if any), agitation speed, and phase hold-up ratio. It can also help to decide if mass transfer effect, in a given reaction under...
In this situation, mass transport limits the overall reaction rate [7]. Then, overcoming mass transfer limitations caused by the depletion boundary layer is critical to improving the reactants’ conversion. Show abstract Aspects of the development of a copper electrowinning cell based on reactive ...
This implies that for any chemical process in a closed system, the mass of the reactants must equal the mass of the products. The change in mass of certain kinds of open systems where atoms or massive particles are not allowed to escape, but other types of energy (such as light or ...