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Characterization of Alumina and Silica Sol-Gel Encapsulated Fe/Co/Ru Nanocatalysts in Microchannel Reactors for F-T Synthesis of Higher Alkanes

Published online by Cambridge University Press:  15 March 2011

D. Kuila ,
V.S. Nagineni ,
S. Zhao ,
H. Indukuri ,
Y. Liang ,
A. Potluri ,
U. Siriwardane ,
N. Seetala  and
J. Fang
D. Kuila
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272 Chemistry Program, Louisiana Tech University, Ruston, LA 71272 dkuila@latech.edu, Phone: 318-257-5121; Fax: 318-257-5104
V.S. Nagineni
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272 Chemistry Program, Louisiana Tech University, Ruston, LA 71272
S. Zhao
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272
H. Indukuri
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272
Y. Liang
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272
A. Potluri
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272
U. Siriwardane
Affiliation:
Chemistry Program, Louisiana Tech University, Ruston, LA 71272
N. Seetala
Affiliation:
Department of Physics, Grambling State University, Grambling, LA 71245
J. Fang
Affiliation:
Institute for Micro manufacturing, Louisiana Tech University, Ruston, LA 71272
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Abstract

We have been investigating conversion of syngas (CO: H2) to higher alkanes [Fischer-Tropsch (F-T) Process] in 5 μm and 25 μm channel microreactors coated with sol-gel encapsulated Fe/Co-nanocatalysts. These nano-metal-catalysts were incorporated into the sol-gel matrix by two methods: 1) metal nitrate solutions; 2) metal oxide nanoparticles. Characterization of these catalysts containing Co and Fe in alumina and silica sol-gel has been carried out by several techniques. The surface area measurements by BET method show an average specific surface area of 285 m2/g for alumina and 300 m2/g for silica sol-gel encapsulated catalysts. In order to optimize the sol-gel preparation and deposition in the microchannels, the elemental composition of sol-gel encapsulated catalyst was examined by EDX. The SEM and AFM images of the reactors before and after deposition of the catalysts have also been studied. Hydrogenation-reduction efficiency of the activated Fe-Co catalysts and the level of poisoning after the reaction were estimated using a vibrating sample magnetometer (VSM). The result suggests more efficient reduction in the case of the nano-particle metal oxides compared to that derived from metal nitrate solutions. In overall, 85% of the catalyst is poisoned after 25 hrs of catalytic reaction. The surface area and the syngas conversion results indicate that silica sol-gel matrix may be a better catalyst support. For alumina sol-gel support, higher conversion of syn-gas is observed with 25 μm microreactor channels. For silica sol-gel, syngas conversion as high as 73% has been achieved by adding Ru as a promoter to the Fe/Co catalyst mixture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 820: Symposia O/R – Nanoengineered Assemblies and Advanced Micro/Nanosystems , 2004 , O3.4
Copyright
Copyright © Materials Research Society 2004

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