Performance Study on Microchannel Coated Catalytic Plate Reactor Using Electrophoresis Technique for Medium Temperature Shift (MTS) Reaction

Abstract

The medium temperature shift (MTS) microreactor has been proposed in order to decrease the CO content of reformate for fuel cell applications. The Ni–K/CeO2 catalyst is synthesized and coated on stainless-steel plates by electrophoretic deposition (EPD) and then evaluated at 300–390 °C. The morphology of the catalyst layers are analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM), and three-dimensional (3D) optical microscopy. The FT-IR analysis and conductivity measurements are used for slurry characteristics of different polyethylenimine (PEI) contents. The activity of the catalytic plates inside the microreactor is tested at different gas hourly space velocity (GHSV) values and H2O/CO molar ratio of 3. The CO conversion is raised by increasing the coating time from 1 min to 3 min, and it has an optimum at 140 V for applied voltage (between 30 V and 180 V). Also, it is found that the CO conversion is optimal at a PEI content of 0.3 wt %. Generally, the optimum conditions are achieved at 3 min, 140 V, and 0.3 wt % PEI, which results to 93% and 5.8% (GHSV = 12 000 mL h–1 gcat –1) for CO conversion and CH4 selectivity, respectively. Consequently, the results confirm the fact that the microreactor performance will be enhanced, compared to using a packed-bed reactor.

Pd/TiO2 Coated in a Microscale‐Based Reactor by Electrophoretic Deposition for Biohydrogenated Diesel Production

“…As the EPD voltage increased, the amount of TiO 2 coated on stainless‐steel substrate increased but the degree of adhesion decreased. It was noted that the deposition rate depends on voltage and deposition time 23. In this study, the deposition time was kept constant, the higher amount of catalyst was obtained at 5 and 7 V as compared to the ones prepared at 3 and 4 V, leading to loose packing layer and cracking 36.…”

“…This technique is a versatile process which requires short deposition time 21, 22. There are several current studies about catalyst coating by EPD for different applications 23–27. For improving dispersion and adhesion, several additives are used in solution such as Tiron (1,2‐dihydroxybenzene‐3,5‐disulfonic acid), Pluronic F127, polyethyleneimine (PEI), polyacrylic acid (PAA) sodium salt, and carboxymethyl cellulose (CMC) sodium salt 28, 29.…”

Water‐Gas Shift Reaction in a Microchannel Ni‐based Catalytic Coated Reactor: Effect of Solvents

“…The activity tests of the catalyst coatings were conducted in a stainless‐steel plate microreactor 37 in the medium temperature range of 300–390 °C. The stainless‐steel microreactor has splitting‐joining channels (108 mm × 1 mm × 30 μm) for passing of the feed flow 38. The channels were coated by catalyst (a couple of coatings for each test), which were prepared with the EPD method.…”

Janus membranes for membrane distillation: Recent advances and challenges

“…In another type of method, it is possible to adjust the reaction time of the polymeric dope solution to make a gradient reaction across the membrane width. In this method the composition of dope solution is accurately selected to have different reaction rate and difference in reaction rate make integrated asymmetric membrane with opposite wettability in both sides [31,68,75,76].…”