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Green chemistry catalysts made from polarized hydroxyapatite (HAp) scaffolds show significant improvements in carbon and dinitrogen fixation reactions. These nanoporous HAp catalysts offer a scalable, eco-friendly alternative to heavy metal catalysts.

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Area of Science:

  • Materials Science
  • Catalysis
  • Green Chemistry

Background:

  • Conventional catalysts for carbon and dinitrogen fixation often rely on heavy metals, posing environmental concerns.
  • Hydroxyapatite (HAp) presents a potential eco-friendly alternative, but its catalytic efficiency needs enhancement.

Purpose of the Study:

  • To develop and evaluate polarized hydroxyapatite (HAp) scaffolds with tailored nanoporous architecture as green catalysts.
  • To investigate the catalytic performance of these HAp scaffolds in key reactions like amino acid synthesis, ethanol production, and ammonia synthesis.

Main Methods:

  • Fabrication of HAp printable inks with controlled nanoporosity using Pluronic hydrogel.
  • Sintering and thermally induced polarization to create nanoporous HAp scaffolds with enhanced mechanical properties (nanoindentation).
  • Evaluation of catalytic activity in reactions involving N2, CO2, CH4, and water.

Main Results:

  • Nanoporous HAp scaffolds exhibited significantly enhanced catalytic activity for carbon fixation (ethanol production, >3000% increase) and dinitrogen fixation (ammonia synthesis, >2000% increase) compared to nonporous HAp.
  • The nanoporosity was a drawback for reactions requiring auxiliary coating layers, hindering catalytic activity.
  • HAp catalysts demonstrated potential for scalability and industrial application in green chemistry.

Conclusions:

  • Polarized, nanoporous HAp scaffolds are effective green catalysts for crucial chemical transformations.
  • The tailored architecture of HAp significantly boosts catalytic efficiency for specific reactions.
  • These HAp-based catalysts offer a promising, sustainable alternative to traditional heavy metal catalysts.