Optimization of the operating conditions for steam reforming of slow pyrolysis oil over an activated biochar-supported Ni-Co catalyst

摘要

Highly performing activated biochar-based catalysts were produced for steam reforming of slow pyrolysis oil. The raw biochar obtained from the slow pyrolysis step was physically activated with CO2 at 700 degrees C and 1.0 MPa and then employed as support. Preliminary tests on steam reforming of acetic acid at 600 degrees C showed that using activated biochar-supported catalysts containing 10 wt % Ni and 7 wt % Co led to a conversion above 90% with a relatively slow deactivation rate. When a representative organic model compounds mixture was used as feed, relatively fast deactivation of the catalyst was observed, prob-ably due to the adsorption of heavy organic compounds, which could subsequently react to form not easily desorbable reaction intermediates. However, the dual Ni-Co catalysts exhibited a good performance during the steam reforming of a real slow pyrolysis oil at 750 degrees C, showing long stability and a constant carbon conversion of 65%.