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Catalysis02:50

Catalysis

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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
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Unique Phase Evolution and Multielemental Effects in Natural Rhodochrosite for Methane Oxidation.

Rensuke Koiwai1, Fernando Garcia-Escobar1, Koki Sakamoto1

  • 1Department of Chemistry, Hokkaido University, North 10, West 8, Sapporo, 060-0810, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 9, 2025
PubMed
Summary
This summary is machine-generated.

Rhodochrosite, a manganese carbonate mineral, acts as a catalyst for methane oxidation, enhancing C2 hydrocarbon production and selectively producing CO. Its complex composition and phase changes under reaction conditions offer potential for selective methane conversion.

Keywords:
manganese oxidemethane oxidationrhodochrosite

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Area of Science:

  • Catalysis
  • Materials Science
  • Mineralogy

Background:

  • Methane oxidation is crucial for energy production and environmental remediation.
  • Developing efficient and selective catalysts for methane conversion is a significant challenge.
  • Rhodochrosite (MnCO3) is a naturally occurring mineral with potential catalytic properties.

Purpose of the Study:

  • To investigate rhodochrosite as a catalyst for methane oxidation.
  • To understand the relationship between rhodochrosite's composition, phase transformations, and catalytic performance.
  • To explore the potential of natural multicomponent minerals in selective methane conversion.

Main Methods:

  • Experimental investigation of rhodochrosite as a catalyst for methane oxidation.
  • Analysis of catalytic products, including C2 hydrocarbons and CO.
  • Thermal treatment of rhodochrosite to study phase transformations.
  • Characterization of mineral phases and trace elements.

Main Results:

  • Rhodochrosite exhibits unique catalytic behavior in methane oxidation.
  • Enhanced formation of C2 hydrocarbons and selective CO production were observed.
  • Rhodochrosite suppresses CO formation while promoting C2H4 production compared to pure MnCO3.
  • Thermal treatment leads to mixed manganese oxide phases (Mn2O3, Mn3O4) with retained impurities influencing catalytic behavior.

Conclusions:

  • Natural rhodochrosite is a promising catalyst for selective methane oxidation.
  • Its compositional complexity and dynamic phase transformations are key to its catalytic activity.
  • Multicomponent natural minerals offer a versatile platform for developing advanced catalysts for methane conversion.