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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Kinetic Study on High-Temperature H2S Removal over Mn-Based Regenerable Sorbent Using Deactivation Model.

Ju Wang1, Jie Xu1, Xianli Wu1

  • 1College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, Shandong, China.

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This study investigated high-temperature hydrogen sulfide (H2S) removal using Mn/Al sorbents. These sorbents demonstrate enhanced reactivity and reduced diffusion resistance for efficient H2S capture.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Environmental Science

Background:

  • High-temperature hydrogen sulfide (H2S) removal is critical for industrial processes and environmental protection.
  • Manganese-based sorbents are promising for H2S capture, but their performance can be limited by deactivation.
  • Understanding the kinetics and deactivation mechanisms of sorbents is essential for optimizing H2S removal.

Purpose of the Study:

  • To investigate the kinetics of high-temperature H2S removal over Mn/Al sorbents prepared by co-precipitation.
  • To evaluate the performance of Mn/Al sorbents compared to pure Mn2O3.
  • To apply a deactivation model to predict H2S breakthrough curves during sulfidation-regeneration cycles.

Main Methods:

  • Preparation of Mn/Al sorbents using the co-precipitation method.
  • Experimental investigation in a fixed-bed reactor under high-temperature conditions.
  • Kinetic analysis using a deactivation model to determine rate constants (k0, kd) and activation energies (Ea, Ed).

Main Results:

  • Mn/Al sorbents exhibited significantly higher initial sorption rate constants (k0) and deactivation rate constants (kd) compared to pure Mn2O3.
  • The enhanced performance is attributed to higher reactivity and reduced diffusion resistance in Mn/Al sorbents.
  • Apparent activation energy (Ea) and deactivation energy (Ed) were determined for a sorbent with 35.4 wt% Mn content.
  • The deactivation model accurately predicted H2S breakthrough curves throughout the sulfidation-regeneration process.

Conclusions:

  • Mn/Al sorbents prepared by co-precipitation show superior performance for high-temperature H2S removal.
  • The developed deactivation model provides a reliable tool for predicting sorbent behavior in cyclic processes.
  • These findings support the use of Mn/Al sorbents for efficient and durable H2S capture applications.