can metal react with H2S gas at high temperature and pressure? can sulfide ions(S2-) react with metal?
It la X7ell known that gaseous hydrogen sulfide and aqueous hydrogen sulfide are very reactive in their reactions. Naturally scientific curiosity leads one to the inquiry into the reactivity of liquid hydrogen sulfide. Although some systematic work has "been done on the reactions of other liquid hydrides like liquid v/ater, liquid ammonia, and liquid halogen hydrides, no systematic TOrk on the reactions of liquid hydrogen sulfide has been conducted except in this laboratory during the last few years.
Yes it can react at higher temperature. Many metal ions readily react with sulfide to form corresponding metal sulfides. Sulfide is also a reducing agent in copper and lead reduction (self reduction or auto reduction process) and the end product is elemental sulfur.
Balakrishna Maravanji sir is Manganese and Molybdenum metal (not metal ion) can react thioacetamide(TAA) in aqueous solution in hydrothermal process at 180 degree for 14 hours and form metal sulfide I mean manganese molybdenum sulfide?
Hello Surabhi, It is possible, provided you take the fine powder (not exposed to air, finely divided) but not in aqueous medium. In aqueous medium finely divided metal powder readily form metal oxides. I do not have any reference book to suggest. Please look into the literature and read about using fine metal powder in chemical synthesis.
All the best to you
Balakrishna
thank you Balakrishna Maravanji for your valuable time and response. actually I am not getting any reference regarding reaction between manganese and molybdenum with thioacetamide and turned into their sulfides. most of the references say reaction between metal ion with thioacetamide.
Dear Surbhi, thank you for posting this very interesting technical question. As for the original question, it depends of the reaction conditions and the kind of metal if H2S gas reacts directly with metals. Highly electropositive metals like lithium will react directly with H2S, whereas more noble metal will not react, at least not with pure H2S under dry conditions. But then think about silver items which become black over a long periods of time. This is a slow reaction with H2S under the influence of oxygen and moisture. Mercury has also been found to slowly react with H2S (see attached pdf file). In this context, please also see the answers given to the following question which has been posted earlier on RG:
Which metals can have reversible reactions with hydrogen sulphide gas?
https://www.researchgate.net/post/which_metals_can_have_reversible_reactions_with_hydrogen_sulphide_gas
I hope this helps. Good luck with your research!
Surbhi Anand
Study the Ellingham and Pourbaix diagrams for your systems. These will indicate regions where reaction is likely and which phases may result. The short answer is that it depends on the metal and the temperature plus the presence of moisture etc (pH in solution). See, for example, the attached.
Here, H2S is a weak acid and oxydizing agent (mainly due to H+ ions) while S2- is a strong base and reducing agent. Therefore, the redox reaction occur or not, mainly depend on the reducing ability of metals, they will react directly if the strong ability (Li, Na, K,...) and they need to be supported from the outside oxydizing agents (O2/water, O3,...) if the weak ability (Fe, Cu, Ag,...).
You may find useful to check:
https://www.researchgate.net/post/The-solid-state-reaction-formula-between-Fe-and-H2S
H2S damage the metal by uniform corrosion, pitting and stepwise cracking .
Hi Dr Surbhi Anand . Hydrogen sulfide reacts with metal ions to form metal sulfides, which are insoluble, often dark colored solids. See the link: https://www.sciencedirect.com/topics/engineering/hydrogen-sulfide
Hydrogen sulfide (H2S), either dry or wet, is considered compatible with aluminium up to at least 250 ºC; except (for wet H2S) if significant galvanic corrosion can be expected for the actual application, due to electrical contact with another (more noble) metal or alloy.
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