The effect of Mg location on Co-Mg-Ru/γ-Al₂O₃ Fischer-Tropsch catalysts

Gallagher, James R, Boldrin, Paul, Combes, Gary B, Ozkaya, Don, Enache, Dan I, Ellis, Peter R, Kelly, Gordon, Claridge, John B ORCID: 0000-0003-4849-6714 and Rosseinsky, Matthew J ORCID: 0000-0002-1910-2483 (2016) The effect of Mg location on Co-Mg-Ru/γ-Al₂O₃ Fischer-Tropsch catalysts PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 374 (2061). 20150087-. ISSN 1364-503X, 1471-2962

Text The effect of Mg location on Co-Mg-Ru/γ-Al2O3 Fischer-Tropsch catalysts.pdf - Unspecified Download (1MB)

Abstract

The effectiveness of Mg as a promoter of Co-Ru/γ-Al<inf>2</inf>O<inf>3</inf> Fischer-Tropsch catalysts depends on how and when the Mg is added. When the Mg is impregnated into the support before the Co and Ru addition, some Mg is incorporated into the support in the form of Mg<inf>x</inf>Al<inf>2</inf>O<inf>3+x</inf> if the material is calcined at 550°C or 800°C after the impregnation, while the remainder is present as amorphous MgO/MgCO<inf>3</inf> phases. After subsequent Co-Ru impregnation MgxCo<inf>3-x</inf>O<inf>4</inf> is formed which decomposes on reduction, leading to Co(0) particles intimately mixed with Mg, as shown by high-resolution transmission electron microscopy. The process of impregnating Co into an Mg-modified support results in dissolution of the amorphous Mg, and it is this Mg which is then incorporated into MgxCo<inf>3-x</inf>O<inf>4</inf>. Acid washing or higher temperature calcination after Mg impregnation can remove most of this amorphous Mg, resulting in lower values of x in MgxCo<inf>3-x</inf>O<inf>4</inf>. Catalytic testing of these materials reveals that Mg incorporation into the Co oxide phase is severely detrimental to the site-Time yield, while Mg incorporation into the support may provide some enhancement of activity at high temperature.

Item Type:	Article
Uncontrolled Keywords:	Fischer-Tropsch, catalysis, cobalt, alumina, XRD
Depositing User:	Symplectic Admin
Date Deposited:	14 Apr 2016 15:39
Last Modified:	16 Jun 2026 08:16
DOI:	10.1098/rsta.2015.0087
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3000563
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