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Synthesis of nanocrystalline mesoporous Ni/Al2O3SiO2 catalysts for CO2 methanation reaction
Authors:Shima Valinejad Moghaddam  Mehran Rezaei  Fereshteh Meshkani  Reihaneh Daroughegi
Affiliation:1. Catalyst and Advanced Materials Research Laboratory, Chemical Engineering Department, Faculty of Engineering, University of Kashan, Kashan, Iran;2. Institute of Nanoscience and Nanotechnology, University of Kashan, Kashan, Iran
Abstract:A series of nanocrystalline mesoporous Ni/Al2O3/>SiO<sub>2</sub> catalysts with various SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratios were prepared by the sol-gel method for the carbon dioxide methanation reaction. The synthesized catalysts were evaluated in terms of catalytic performance and stability. The catalysts were studied using XRD, BET, TPR and SEM. The BET results indicated that the specific surface area of the samples with composite oxide support changed from 254 to 163.3 m<sup>2</sup>/g, and an increase in the nickel crystallite size from 3.53 to 5.14 nm with an increment of Si/Al molar ratio was visible. The TPR results showed a shift towards lower temperatures, indicating a better reducibility and easier reduction of the nickel oxide phase into the nickel metallic phase. Furthermore, the catalyst with SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> molar ratio of 0.5 was selected as the optimal catalyst, which showed 82.38% CO<sub>2</sub> conversion and 98.19% CH<sub>4</sub> selectivity at 350 °C, high stability, and resistivity toward sintering. Eventually, the optimal operation conditions were specified by investigating the effect of H<sub>2</sub>/CO<sub>2</sub> molar ratio and gas hourly space velocity (GHSV) on the catalytic behavior of the denoted catalyst.</td> </tr> <tr> <td align=
Keywords:Nanocatalyst  Sol-gel  Alumina-silica composite  Methanation  Carbon dioxide
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