Chemical Engineering

The durability of carbon supported Pt nanowire as novel cathode catalyst for a 1.5kW PEMFC stack
Carbon supported platinum nanowires (PtNW/C) synthesized by a simple and inexpensive template-free methodology has been used for the first time as a cathode catalyst in a 15 cell with an active area of 250cm2, 1.5kW proton exchange membrane fuel cell (PEMFC) stack. Drive cycle testing along with in-situ and ex-situ accelerated degradation testing (ADT) showed that the PtNW/C catalyst exhibited ...


Battery Sizing for Plug-in Hybrid Electric Vehicles in Beijing: A TCO Model Based Analysis
This paper proposes a total cost of ownership (TCO) model for battery sizing of plug-in hybrid electric vehicles (PHEVs). The proposed systematic TCO model innovatively integrates the Beijing driving database and optimal PHEV energy management strategies developed earlier. The TCO, including battery, fuel, electricity, and salvage costs, is calculated in yearly cash flows. The salvage cost, bas...
Near-IR organic sensitizers containing squaraine and phenothiazine units for dye-sensitized solar cells
Unsymmetrical squaraine near-infrared (NIR) sensitizers with variable π-bridge units, based on the donor-π-squaraine core-acceptor structural motif, were synthesized and used as sensitizers for dye-sensitized solar cells. The phenothiazine as a donor group was linked to a squaraine core unit using various thiophene derivatives. Among them, three squaraine-based sensitizers have a carboxylic a...


N-Methylquinolinium derivatives for photonic applications: Enhancement of electron-withdrawing character beyond that of the widely-used N-methylpyridinium
A series of π-conjugated styryl quinolinium push–pull chromophores have been designed and synthesized in order to examine the electron-withdrawing strength of various quinolinium electron acceptor groups, and their influence on the photophysical properties and in particular on the second-order nonlinear optical response. The static molecular first hyperpolarizabilities measured by long-wavel...
Modelling of a solid dissolution in liquid with chemical reaction: Application to the attack reaction of phosphate by sulphuric acid
This paper aims at the determination of the kinetics and thermodynamics of a liquid–solid reaction: the attack reaction of the phosphate ore by sulphuric acid. This reaction, which is used industrially for the production of phosphoric acid, has two stages, the first of which consists in the dissolution of phosphate ore in the diluted phosphoric acid diluted and the second relates to the attac...


Modelling of particulate matter transformations and capture efficiency
In the current work, a comprehensive computational fluid dynamics (CFD) model is developed for an accurate description of the transport and transformation of automotive particulate matter (PM) in monolithic reactors. The model accounts for the developing gas flow, the evaporation of hydrocarbons (HCs) from the particles, and the adsorption of HCs in the washcoat, as well as motion, shrinkage, a...
A modification in the flotation process of a calcareous–siliceous phosphorite that might improve the process economics
The amenability of a low-grade Egyptian phosphorite to flotation for separation of both calcareous and siliceous gangue minerals by just pH control was investigated. The ore, assaying 19.39% P2O5, 16.1% L. O. I. and 12.41% A. I. is mainly composed of francolite and hydroxy apatite minerals consolidated into three different phosphatic varieties according to texture and origin, i.e. coarse phosph...

Organic wastes as carbon sources to promote sulfate reducing bacterial activity for biological remediation of acid mine drainage
Chicken manure, dairy manure and sawdust were evaluated as carbon sources in promoting sulfate reduction, and the mechanism of heavy metals removal in sulfidogenic bioreactor was revealed. The sulfate reduction reached 79.04% for chicken manure, 64.78% for dairy manure, and 50.27% for sawdust on 35th day, which showed that chicken manure could promote sulfate reducing bacteria (SRB) activity, f...
Understanding of the liquid overflow behavior inside micro-structured falling film reactors based on a wetting approach
This study investigates the behavior of gravity-driven liquid films inside falling film micro-reactors and focuses on the conditions necessary to obtain and break-up the complete liquid overflow from all of the channels. Micro-structured falling film reactors containing 6–10 straight parallel rectangular micro-channels were designed, constructed and tested. The main objective was to show expe...

Parallel algorithms for CFD–DEM modeling of dense particulate flows
Most of the CFD codes are parallelized under distributed-memory parallel computing environments. For this reason, many attempts have been made to develop parallel DPM/DEM algorithms for dense particulate flows under the same parallel architecture. For such a development, it is very difficult to achieve efficient load balancing of processors due to the heterogeneous particle spatial distribution...
Calcination and characterisation studies of a Brazilian manganese ore tailing
This paper discusses the systematic analysis of the results of calcination as a function of size fraction performed on a sample of Brazilian silicate-carbonate manganese ore tailing at 800°C. The raw materials and the corresponding calcination products were analysed using several analytical techniques, including determination of density, specific surface area and porosity, chemical analysis an...

Influence of disposal configurations on hydrogeological behaviour of sulphidic paste tailings: A field experimental study
Surface paste disposal (SPD) is a new alternative employed by the mining industry for storage of mine tailings at the surface. In comparison with the conventional slurry tailings disposal, SPD could offer operational and environmental advantages, such as a better water management, no need for complex retaining dams, a reduced footprint of the tailings disposal area, and the possibility to use p...
LES study of settling particle cloud dynamics
A series of Euler-Lagrangian four-way coupling Large Eddy Simulations (LES) are performed to study the dynamics of settling particle clouds. The numerical method is first validated by comparing with existing experimental results. Then, a parametric study is performed with various initial release shapes, particle sizes, and cloud buoyancies. Three issues are examined in detail, including the ini...
A reduced-order model for porous flow through thin, structured materials
Darcy’s equations are frequently used as a coarse-grained numerical expedient for modeling multiphase flow through complex porous materials. In some applications, the porous material may be quite thin, allowing the possibility of further simplification of the equations. In this paper we derive a reduced-order shell finite-element model for flow through thin porous materials using an approach ...
Simulation of dynamic fluid–solid interactions with an improved direct-forcing immersed boundary method
Dynamic fluid–solid interactions are widely found in chemical engineering, such as in particle-laden flows, which usually contain complex moving boundaries. The immersed boundary method (IBM) is a convenient approach to handle fluid–solid interactions with complex geometries. In this work, Uhlmann's direct-forcing IBM is improved and implemented on a supercomputer with CPU–GPU hybrid arch...