Nanostructured Ce Cu mixed oxide synthesized by solid state reaction for medium temperature shift reaction: Optimization using response surface method |
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| Authors: | Yegane Davoodbeygi Abdullah Irankhah |
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| Affiliation: | Hydrogen and Fuel Cell Research Laboratory, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran |
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| Abstract: | Solid state reaction was applied as a simple and cheap process for synthesizing Ce0.9Cu0.1O1.9 mixed oxide by milling of CuO and CeO2. Response surface methodology (RSM) technique was used to design a three-levels-two-factors (milling times of 20, 95 and 170 min and milling speeds of 100, 150 and 200 rpm) to investigate and optimize CO conversion in medium temperature shift (MTS) reaction (300–390 °C). According to contour plots, the interaction between parameters (time and speed of) is so important. Determined optimal values of milling time and speed which lead to conversions of 34.9, 47.2, 61.4 and 71.7% at 300, 330, 360 and 390 °C, are 120 min and 162 rpm, respectively. X-ray diffraction (XRD) analysis showed that the trend of crystalline size versus milling speed is different for each milling time: constant for low times, with a maximum for medium times and incremental for high times. Increasing milling time and speed leads to BET surface area decrease and Cu | |
| Keywords: | Solid state reaction Ball mill Catalyst Copper-ceria solid solution Medium temperature shift |
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