Biochar

Coffee!Up in the Czech Republic is transforming used coffee grounds into products like natural soap, coffee oil, biomass, and biochar, as highlighted by the European Commission. This initiative is significant for the advanced carbon materials sector because it demonstrates the potential for waste coffee grounds to be converted into valuable materials such as biochar, which can improve soil health and contribute to carbon sequestration efforts.

Researchers at Shihezi University used phosphoric acid-activated walnut shell biochar to catalytically pyrolyze waste agricultural plastic mulch film at three temperatures (300, 350, 400 °C), finding that 350 °C maximized olefin selectivity at 69% while 400 °C reduced tar deposition and produced carbon deposits with lower activation energy for easier regeneration. The findings give biochar catalyst developers a temperature-based framework for balancing product selectivity against catalyst deactivation and regenerability in agricultural plastic pyrolysis systems.

The EU-funded HOOP project helped eight European cities and regions mobilise EUR 124 million to convert urban biowaste into circular bioeconomy outputs including biochar, biogas, bioplastics, and agricultural nutrients. Biochar production via pyrolysis emerged as a replicable pathway across multiple territories, with Kuopio (Finland) establishing an operational pilot plant and Münster (Germany) confirming technical feasibility, signaling growing municipal-scale demand for pyrolysis infrastructure relevant to the biochar sector.