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Topics in Catalysis

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03-12-2022 | Original Paper

Effect of Al₂O₃ Support on Co-Based SiO₂ Core–Shell Catalysts for Fischer–Tropsch Synthesis in 3D Printed SS Microchannel Microreactor

Authors: Meric Arslan, Sujoy Bepari, Richard Abrokwah, Nafeezuddin Mohammad, Juvairia Shajahan, Debasish Kuila

Published in: Topics in Catalysis | Issue 5-8/2023

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Abstract

Fischer Tropsch Synthesis (FTS) using syngas, a mixture of carbon monoxide (CO) and hydrogen (H₂), obtained from renewable sources in the presence of a catalyst, is an excellent route to long-chain hydrocarbons and fuels. In this study, cobalt-mesoporous silica catalysts for FTS were prepared by two procedures-Co@SiO₂ at 200 °C, and high pressure in an autoclave (AC), Co@SiO₂ (One Pot or OP) at room temperature and 1 atm; the effect of Al₂O₃ on Co-SiO₂ as Co@SiO₂Al₂O₃ (One Pot or OP) core–shell catalysts was investigated for FTS at 20 bar in 3D printed stainless steel (SS) microchannel microreactors. These catalysts were characterized by different techniques such as N₂ physisorption, XRD, SEM, TEM, H₂-TPR, TGA–DSC, and XPS. The N₂ physisorption studies show that the BET surface area of Co@SiO₂ (Autoclave) is much higher than that of Co@SiO₂ (One Pot), and the surface area decreases upon the addition of Al₂O₃ to yield Co@SiO₂Al₂O₃ (OP) catalyst. In TPR analysis, the Co@SiO₂ (OP) based catalyst had much higher reduction temperature than the Co@SiO₂ (AC) catalyst. The XRD analysis shows that the Co@SiO₂ (Autoclave) based catalyst is more crystalline when compared to other catalysts. The TEM and SEM images revealed agglomerations in the case of Co@SiO₂ (OP) and Co@SiO₂Al₂O₃ (OP) based catalysts. The TGA analyses of as-synthesized catalysts, before calcination, showed good stability of the catalysts. The oxidation state and binding energy of all catalysts, evaluated by XPS analysis, show a significant shift based on the catalyst preparation. All F-T reactions were carried out in a 3D-printed SS microreactor at 20 bars in the temperature range of 200–370 °C with H₂/CO molar ratio of 2:1. The highest CO conversion for Co@SiO₂ AC, Co@SiO₂Al₂O₃ OP, Co@SiO₂ OP are 85%, 45%, and 27% respectively. The highest selectivity to C₄₊ % was observed for Co@SiO₂ AC in SS Microreactors in the temperature range of 200–300 °C, and the % selectivity for the C₄₊ follows the order: Co@SiO₂AC > Co@SiO₂Al₂O₃ OP > Co@SiO₂ OP.

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previous article Ozone Initiated pH Dependent Oxidation of Cyclohexane Over Fe Supported SiO2 and γ-Al2O3 Catalysts

next article Effect of a High Thermal Capacitance Core–Shell Structure on Co-Ru/SiO2 Catalyst for Low Temperature Fischer–Tropsch Synthesis

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Title: Effect of Al2O3 Support on Co-Based SiO2 Core–Shell Catalysts for Fischer–Tropsch Synthesis in 3D Printed SS Microchannel Microreactor
Authors: Meric Arslan
Sujoy Bepari
Richard Abrokwah
Nafeezuddin Mohammad
Juvairia Shajahan
Debasish Kuila
Publication date: 03-12-2022
Publisher: Springer US
Published in: Topics in Catalysis / Issue 5-8/2023
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI: https://doi.org/10.1007/s11244-022-01733-z

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