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Preparation of a multilayered composite catalyst for Fischer-Tropsch synthesis in a micro chamber reactor

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2007
auteur(s) Guillou Loïc; Balloy David; Supiot Philippe; Lecourtois Véronique
journal (abréviation) Applied Catalysis A : General (Appl Catal)
volume (numéro) 324 (17)
  
pages 42 – 51
résumé A 20 wt% Co/SiO2 catalyst grafted on a stainless steel substrate was used for Fischer–Tropsch synthesis (FTS) in a micro-chamber reactor. The fabrication of the catalyst was a complex process involving several steps. The first one, the pre-treatment of the AISI316L substrate through a plasma assisted chemical vapour deposition process (PACVD), allowed the formation of a silicon based polymer. This thin polymeric film was thermally degraded into a silicon oxide bonding layer. The coating of this bonding layer with sol–gel precursor of the Co/SiO2 catalysts was done with a spray coating process. The sequential combination of these steps led to a multilayered catalyst with a complex morphology.
This material demonstrated high activity under FTS reaction. Activity and selectivity were higher under micro-chamber conditions than in a classical fixed-bed catalytic test. This was attributed to the increase of mass and heat transfers within the micro-device. Moreover distribution of metallic masses within the catalyst showed significant evolutions post FTS, including steel compound migrations and possible cobalt segregation.
mots clés Fischer–Tropsch synthesis; Micro-reactor; Coating; Cobalt; Sol–gel catalyst
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