A regenerable oxide-based H2S adsorbent with nanofibrous morphology

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Hydrogen sulfide (H2S) is a toxic and corrosive impurity in raw fuels like natural gas and syngas.
• Current metal oxide adsorbents degrade during repeated H2S removal and regeneration cycles.
• Efficient H2S removal is crucial for catalyst protection and preventing equipment corrosion.

Purpose of the Study:

• To develop a novel adsorbent material for efficient and stable hydrogen sulfide removal.
• To investigate the performance of Zn-Ti-O based adsorbents with nanofibrous morphology.
• To evaluate the durability and regeneration efficiency of the proposed nanostructured sorbents.

Main Methods:

• Synthesis of Zn-Ti-O based adsorbents with a nanofibrous morphology.
• Testing of adsorbent performance in multiple cycles of sulphidation (H2S removal) and re-oxidation (regeneration).
• Characterization of structural and chemical changes in the adsorbent during cycling.

Main Results:

• Zn-Ti-O nanofibrous adsorbents maintained initial reactivity and sulfur removal capacity over multiple regeneration cycles.
• Nanostructured sorbents exhibited rapid reaction rates, overcoming gas-transport limitations of conventional sorbents.
• Efficient regeneration at the same temperature as sulphidation was achieved, preventing sorbent deterioration and reducing energy consumption.

Conclusions:

• Nanofibrous Zn-Ti-O adsorbents offer a durable and energy-efficient solution for hydrogen sulfide removal from fuels.
• The unique nanostructure and phase stabilization contribute to the superior cyclic performance and regeneration.
• This technology presents a promising advancement for cleaner fuel processing and industrial applications.