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Contrast-matching small-angle neutron scattering to monitor the accessibility of solvents to the porosity of coked FCC catalysts

Castro-Diaz, M. and Hall, P.J. and Snape, Colin and Brown, S.D. and Hughes, R. (2002) Contrast-matching small-angle neutron scattering to monitor the accessibility of solvents to the porosity of coked FCC catalysts. Industrial and Engineering Chemistry Research, 41 (25). pp. 6566-6571. ISSN 0888-5885

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Abstract

Small-angle neutron scattering (SANS) has been performed on fresh and deactivated fluid catalytic cracking (FCC) equilibrium catalysts. The catalysts were coked using a vacuum gas oil feed and stripped for varying periods of time in standard microactivity test (MAT) and fluidized-bed reactors. BET surface areas and contrast-matching SANS were measured on these samples to elucidate the influence of coke on the catalyst porosity. It was found that significant contrast matching could be obtained by mixing the catalyst with deuterated methanol, and there was good agreement between the gas adsorption and SANS results in terms of the mesoporosity. SANS indicated that the level of closed porosity is negligible in the fresh catalyst but significant in the deactivated catalysts and that the level decreases as the total coke content is reduced during stripping. Furthermore, the use of d-dodecane demonstrated that SANS can also provide information about sieving effects caused by the catalyst structure.

Item type: Article
ID code: 3797
Keywords: chemical engineering, neutrons, porosity, solvents, Chemical technology, Chemistry, Chemical Engineering(all), Chemistry(all), Industrial and Manufacturing Engineering
Subjects: Technology > Chemical technology
Science > Chemistry
Department: Faculty of Engineering > Chemical and Process Engineering
Faculty of Science > Pure and Applied Chemistry
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 04 Jul 2007
    Last modified: 04 Sep 2014 10:57
    URI: http://strathprints.strath.ac.uk/id/eprint/3797

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