DFT study of the reduction reaction of calcium perchlorate on olivine surface: Implications to formation of Martian’s regolith

Escamilla-Roa, ElizabethLuleå tekniska universitet,Rymdteknik,Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain (författare)

DFT study of the reduction reaction of calcium perchlorate on olivine surface : Implications to formation of Martian’s regolith

Validerad;2020;Nivå 2;2020-02-17 (johcin)
Perchlorates have been found widespread on the surface of Mars, their origin and degradation pathways are not understood to date yet. We investigate here, from a theoretical point of view, the potential redox processes that take place in the interaction of Martian minerals such as olivine, with anhydrous and hydrated perchlorates. For this theoretical study, we take as mineral substrate the (1 0 0) surface of forsterite and calcium perchlorate salt as adsorbate. Our DFT calculations suggests a reduction pathway to chlorate and chlorite. When the perchlorate has more than 4 water molecules, this mechanism, which does not require high-temperature or high energy sources, results in parallel with the oxidation of the mineral surface, forming magnesium peroxide, MgO2, and in the formation of ClO3, which through photolysis is known to form ClO-O2. Because of the high UV irradiance that reaches the surface of Mars, this may be a source of O2 on Mars. Our results suggest that this process may be a natural removal pathway for perchlorates from the Martian regolith, which in the presence of atmospheric water for salt hydration, can furthermore lead to the production of oxygen. This mechanism may thus have implications on the present and future habitability of the Martian surface.

NATURVETENSKAP Kemi Materialkemi hsv//swe
NATURAL SCIENCES Chemical Sciences Materials Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Maskinteknik Rymd- och flygteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Aerospace Engineering hsv//eng
Calcium perchlorate
Reduction
Oxygen
Water
Mars
Chlorate
Chlorite
Ozone
Magnesium peroxide
Regolith
(1 0 0) forsterite surface
Olivine
Chemisorption
Physisorption
Redox
Infrared spectroscopy
Density Functional Theory (DFT)
Atmospheric science
Atmosfärsvetenskap

Zorzano Mier, María-PazLuleå tekniska universitet,Rymdteknik,Centro de Astrobiología (INTA-CSIC), Torrejón de Ardoz, Madrid, Spain(Swepub:ltu)marzor (författare)
Martin-Torres, JavierLuleå tekniska universitet,Rymdteknik,Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain(Swepub:ltu)javmar (författare)
Hernández-Laguna, AlfonsoInstituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain (författare)
Saínz-Díaz, C.IgnacioInstituto Andaluz de Ciencias de la Tierra (CSIC-UGR), Granada, Spain (författare)
Luleå tekniska universitetRymdteknik (creator_code:org_t)

Av författaren/redakt...: Escamilla-Roa, E ...; Zorzano Mier, Ma ...; Martin-Torres, J ...; Hernández-Laguna ...; Saínz-Díaz, C.Ig ...

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