Walnut shell char becomes reusable catalyst for chemical synthesis
Nouri M, Hajjami M, Ghorbani-Choghamarani A, Siahpour Z
Soil Health
The walnut shells you'd normally toss in the compost or trash could one day be baked into industrial catalysts, giving another practical afterlife to garden and orchard waste.
Researchers took walnut shells, burned them into a charcoal-like material called biochar, and coated it with a special coating plus tiny palladium metal particles. The resulting material worked as a reusable tool that helps chemists stick different carbon-based molecules together to make new compounds, and it kept working well even after being used five times in a row.
Key Findings
Biochar/g-C3N4 support was produced by pyrolyzing walnut shells at 550°C for 2 hours
Palladium nanoparticles stabilized with polyethyleneimine (PEI) enabled efficient Stille (C-C) and Ullmann-type (C-N) coupling reactions to make biphenyls and aryl amines
The catalyst retained high activity through at least five recycling and reuse cycles
chevron_right Technical Summary
Chemists turned walnut shell waste into a reusable catalyst that helps build complex molecules like biphenyls and aryl amines, showing biochar's potential beyond soil use.
Abstract Preview
Original paper
Stille- and Ullmann-type coupling reactions catalysed by palladium supported biochar/g-C3N4-polyethyleneimine as a heterogeneous nanocatalyst.
Biochar, a carbon-rich product from biomass pyrolysis, is gaining traction as a soil amendment, catalyst support, and pollutant adsorbent. This study synthesized a novel Pd@biochar/g-C3N4-PEI heter...
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