Synthesis of Pt- and Pd-sulphides in low temperature (85�C) solutions buffered by clay minerals and graphite: Preliminary results

Tarkian, M.; Evstigneeva, T. L.; Горшков, А. И.

doi:10.1007/bf01165764

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Hoffman and MacLean (1976) investigated the ternary system Pd-Te-Bi and found that the melting temperature of michenerite varies from 489°C (Bi-rich) to 501°C (Te-rich). At the other end of the temperature scale, Tarkian et al (1996) synthesized Pt-and Pd-sulfides under reducing conditions in chloride solutions at 85°C.…”

Section: Discussionmentioning

confidence: 99%

Geochemistry and mineralogy of platinum-group elements at Hartley Platinum Mine, Zimbabwe

Oberthür

Weiser²,

Gast

et al. 2003

Miner Deposita

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The Main Sulfide Zone (MSZ) is the most prominent layer of the Great Dyke layered intrusion carrying economic platinum-group element (PGE) mineralization. At the Hartley Platinum Mine, the MSZ is up to some meters thick and is composed of a basal PGE-rich subzone which overlaps slightly with a base metal, sulfide-rich subzone on top. Based on the degree of sulfide mineralization and PGE ratios, the subzones can be further divided into geochemically distinct layers. Stratigraphically upwards, the MSZ displays metal profiles characterized by increasing Cu/Ni, Pt/Pd and PPGE/IPGE ratios, accompanied by a general element decoupling in the order Pd fi Pt fi base metals, more specifically IPGE fi Pd fi Pt fi (Ni,Cu,Co,S (sulfides), Au,Te,Bi. The fine structure of the MSZ is regarded to reflect primary magmatic features of consecutive batches of sulfide accumulation, concomitant scavenging of PGE, and fractionation. Sulfide deposition was followed by a second, limited subsolidus stage of PGE redistribution. Mineralogically, most of the Pd and Rh is hosted in pentlandite, whereas Pt is dominantly present in the form of discrete platinum-group minerals (PGM). Within the MSZ sequence, sperrylite is present throughout the PGE subzone of the MSZ, cooperite/ braggite occur mainly in its basal part, and the (Pt,Pd)-bismuthotellurides concentrate at the top. These findings indicate that a large proportion of the PGE, primarily concentrated in sulfide under magmatic conditions, was redistributed in the subsolidus stage and formed discrete PGM with available reactant partners. Chemical gradients and magmatic-hydrothermal fluids probably led to small-scale redistribution of PGE within the MSZ.

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Section: Discussionmentioning

confidence: 99%

Geochemistry and mineralogy of platinum-group elements at Hartley Platinum Mine, Zimbabwe

Oberthür

Weiser²,

Gast

et al. 2003

Miner Deposita

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Effects of contaminants on catalyst activity

Garzón

Uribe

2010

Handbook of Fuel Cells

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Hydrogen fuel and ambient air contaminants that exhibit strong electrode catalyst chemisorption may severely degrade the performance of polymer membrane fuel cells. Common fuel‐reforming impurities include carbon monoxide and hydrogen sulfide and air impurities include sulfur oxides and nitrogen oxides. CO contamination at parts per million (ppm) levels severely affects fuel cell performance; however, a number of methods including depolarization, air bleeding, and CO tolerant catalyst alloys will mitigate the performance losses. In contrast, the deposition of S on Pt surface from adsorption of sub‐ppm levels of H 2 S in the H 2 ‐fuel stream results in severe fuel cell performance degradation. The oxidative removal of adsorbed S is a kinetically hindered process and is not achievable at reasonable rates in normal fuel cell operation.

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Kufahrite, PtPb, a new mineral from Ledyanoy Creek placer, Galmoenan ultramafic complex, Koryak Highlands, Russia

Sidorov

Kutyrev

Zhitova

et al. 2021

MinMag

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Synthesis of Pt- and Pd-sulphides in low temperature (85�C) solutions buffered by clay minerals and graphite: Preliminary results

Cited by 5 publications

References 6 publications

Geochemistry and mineralogy of platinum-group elements at Hartley Platinum Mine, Zimbabwe

Geochemistry and mineralogy of platinum-group elements at Hartley Platinum Mine, Zimbabwe

Effects of contaminants on catalyst activity

Kufahrite, PtPb, a new mineral from Ledyanoy Creek placer, Galmoenan ultramafic complex, Koryak Highlands, Russia

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