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Durham University

Department of Earth Sciences

Postgraduate Students

Publication details for Prof. Chris Greenwell

Perera-Solis, Diego D., Pimlott, Matilda, Fidment, Ella, Whiting, Andrew & Greenwell, Hugh Christopher (2019). Adding Value to Waste Minerals in a Circular Economy Framework: Ochre-Derived Layered Double Hydroxide Catalysts in Fatty Acid Ketonisation. Minerals 9(11): 681.

Author(s) from Durham

Abstract

Mineral carbonation is known to be among the most efficient ways to reduce the
anthropogenic emissions of carbon dioxide. Serpentine minerals (Mg3Si2O5(OH)4), have shown great
potential for carbonation. A way to improve yield is to thermally activate serpentine minerals prior
to the carbonation reaction. This step is of great importance as it controls Mg2+ leaching, one of the
carbonation reaction limiting factors. Previous studies have focused on the optimization of the
thermal activation by determining the ideal activation temperature. However, to date, none of these
studies have considered the impacts of the thermal activation on the efficiency of the aqueous-phase
mineral carbonation at ambient temperature and moderate pressure in flue gas conditions. Several
residence times and temperatures of activation have been tested to evaluate their impact on
serpentine dissolution in conditions similar to mineral carbonation. The mineralogical composition
of the treated solids has been studied using X-ray diffraction coupled with a quantification using
the Rietveld refinement method. A novel approach in order to quantify the meta-serpentine formed
during dehydroxylation is introduced. The most suitable mineral assemblage for carbonation is
found to be a mixture of the different amorphous phases identified. This study highlights the
importance of the mineralogical assemblage obtained during the dehydroxylation process and its
impact on the magnesium availability during dissolution in the carbonation reaction.