Article pubs.acs.org/EF
Performance Study on Microchannel Coated Catalytic Plate Reactor Using Electrophoresis Technique for Medium Temperature Shift (MTS) Reaction Mahsa Bazdar and Abdullah Irankhah* Hydrogen and Fuel cell Research Laboratory, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran 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.
1. INTRODUCTION Supplying hydrogen as a high potential candidate for mobile application and fuel processing systems has been widely evaluated these days. For future energy generation for stationaries and much-higher energy densities, less polluting applications will be based, to a substantial extent, upon fuel-cell technology. In most current applications, poroton exchange membrane fuel cells (PEMFC) technology is employed. Hydrogen acts as a fuel in fuel cells provided through either steam reforming or autothermal reforming of hydrocarbons that contain 1%−10% CO. PEMFC is sensitive to CO at the operating temperature, because of the remaining CO in reformate adsorbing irreversibly on the Pt electrode and hindering the electrochemical reaction.1−4 Therefore, CO must be removed from the reformate gases to a level of
