Jump to main content
Jump to site search

Issue 71, 2016, Issue in Progress
Previous Article Next Article

Monolithic supports based on biomorphic SiC for the catalytic combustion of hydrogen

Author affiliations

Abstract

Catalytic hydrogen combustion was studied with H2/air mixtures in conditions that simulate the H2 concentration of the exhaust gases from fuel cells (3–4% v/v H2 in air). Pt-impregnated monoliths based on porous biomorphic SiC (bio-SiC) substrates were employed for the first time for this reaction. Capillary forces were exploited for the incipient impregnation of supports with H2PtCl6 solutions. Freeze drying permitted us to obtain a homogeneous distribution of the active phase reducing accumulation at the monolith's outer shell. The supports and catalysts were characterized from a structural and thermal point of view. Catalytic tests were performed in a homemade reactor fed with up to 1000 ml min−1 H2/air mixtures and a diffusional regime (non-isothermal) was achieved in the selected conditions. Catalyst loading was tested in the range of 0.25–1.5 wt% Pt and 100% conversion was achieved in all cases. Temperatures were recorded at different points of the monoliths during the reaction showing anisotropic thermal behavior for selected bio-SiC substrates. These effects are of interest for heat management applications and were explained in correlation with thermal conductivity measurements performed on the supports. Pt-impregnated monoliths were also tested in less than 100% conversion conditions (1% v/v H2 in air) and in powder form in kinetic conditions for comparative purposes.

Graphical abstract: Monolithic supports based on biomorphic SiC for the catalytic combustion of hydrogen

Back to tab navigation

Supplementary files

Publication details

The article was received on 08 Apr 2016, accepted on 01 Jul 2016 and first published on 06 Jul 2016


Article type: Paper
DOI: 10.1039/C6RA09127J
Citation: RSC Adv., 2016,6, 66373-66384
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    Monolithic supports based on biomorphic SiC for the catalytic combustion of hydrogen

    G. M. Arzac, J. Ramírez-Rico, A. Gutiérrez-Pardo, M. C. Jiménez de Haro, D. Hufschmidt, J. Martínez-Fernández and A. Fernández, RSC Adv., 2016, 6, 66373
    DOI: 10.1039/C6RA09127J

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements