Design and preparation of carbon material catalyst modified with metal framework and sulfonate for biochar generation from low-temperature directional pyrolysis of kitchen waste: Mechanism and performance

In order to reduce the pyrolysis temperature during the process of directional conversion from kitchen waste (KW) into aromatic biochar, a kind of catalyst was prepared with carbon material coated with tri-metallic oxide (Fe2O3, MgO and Al2O3) combining with sulfonic acid groups (CMO@SA) according to KW compositions. The aromaticity of KW pyrolysis biochar (KWB) increased when the temperature ranged from 170 to 210 degrees C. The catalytic pyrolysis temperature of KW reduced from 500 to 190 degrees C for biochar generation with similar aroma-ticity due to amendment of CMO@SA. The maximum adsorption capacity of catalytic pyrolysis KWB was 160.23 mg/g for dyeing wastewater, which was equivalent to biochar generated at 500 degrees C. The decrease of pyrolysis temperature was attributed to the reduction of bonds fracture activation-energy among C-H, C-C and C-O under the catalytic function. The catalytic activity and recovery of CMO@SA kept at 92 % and 90 % after five recycle.