Stability of Nanocrystals: Thermodynamic Analysis of Oxidation and Re-reduction of Cobalt in Water/Hydrogen Mixtures

Autor:	Visagie Jacobus Lucas, Mark E. Dry, Jan van de Loosdrecht, Eric van Steen, Elvera Viljoen, Michael Claeys
Rok vydání:	2005
Předmět:	Materials science Hydrogen Inorganic chemistry chemistry.chemical_element Surfaces Coatings and Films Catalysis Metal chemistry Nanocrystal Chemical engineering visual_art Materials Chemistry visual_art.visual_art_medium Crystallite Physical and Theoretical Chemistry Cobalt
Zdroj:	The Journal of Physical Chemistry B. 109:3575-3577
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp045136o
Popis:	The stability of nanosized materials differs significantly from the stability of bulk materials. In this study a thermodynamic analysis on the simultaneous oxidation and re-reduction of small metallic cobalt crystallites in the presence of water and hydrogen as a function of the crystallite diameter was performed as a model for catalyst deactivation in the Fischer-Tropsch synthesis. It is shown that spherical cobalt crystallites with a diameter less than 4.4 nm are likely to be oxidized under realistic Fischer-Tropsch synthesis conditions (p(H)(2)(O)/p(H)(2) < 1.5, T = 493 K).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b84942f5f7ee0819cb59429ac376c2a7 https://doi.org/10.1021/jp045136o Zobrazit plný text záznamu