Microreactors for Syngas Conversion to Higher Alkanes: Characterization of Sol-Gel-Encapsulated Nanoscale Fe-Co Catalysts in the Microchannels

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• 作者：Venkata S. Nagineni ; Shihuai Zhao ; Avinash Potluri ; Yu Liang ; Upali Siriwardane ; Naidu V. Seetala ; Ji Fang ; James Palmer ; and Debasish Kuila
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2005
• 出版时间：July 20, 2005
• 年：2005
• 卷：44
• 期：15
• 页码：5602 - 5607
• 全文大小：342K
• 年卷期：v.44,no.15(July 20, 2005)
• ISSN：1520-5045

文摘

Silicon microreactors have been coated with mixed-metal Fe-Co Fischer-Tropsch catalysts inalumina sol-gel for conversion of syngas (CO + H₂) to higher alkanes. Characterization of thenanocatalysts using scanning electron microscopy, energy-dispersive X-ray, atomic forcemicroscopy, and Brunauer-Emmett-Teller surface area measurements, packaging, and thereaction results from a mass spectrometer at controlled temperatures (200-260 C) and pressure(1 atm) with varying H₂:CO ratios from 1:1 to 10:1 are described. The catalyst does not adequatelyinfiltrate the 5-m channels; it coats nicely the 25-m channels. The initial results are consistentwith a lower conversion of CO (~32%) in a 5-m-channel reactor and a higher conversion (~52%)in a 25-m-channel reactor. The selectivity to propane (~80%) is not affected by the width ofthe microchannels. The activity of the sol-gel-encapsulated catalyst before and after the reactionsis estimated from its magnetic properties using a vibrating sample magnetometer.