Catalytic cracking of tars derived from rice hull gasification over goethite and palygorskite

摘要

Palygorskite (P), goethite (G), and hydrothermally synthesized goethite (HG) were used as supports for Feudand Ni. The catalytic activity of these materials was investigated involving in P, G and HG (supported Feudand Ni) for catalytic decomposition of biomass tar derived from rice hull gasification. The materials wereudcharacterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), and transmission electron microscopyud(TEM) with an energy dispersive X-ray (EDS). The catalytic activity of P for removal of tar was significantlyudbetter than that of G and HG. However, the activity of G with 6 mass% Ni labeled as Ni6/G (tar conversionud94.6%), which was equal to Fe6Ni6/P (94.4%), was better than Ni6/P (64.4%) and Ni6/HG (46.7%). Whenudthe loading of Ni (mass%) was 6 mass% on G, tar conversion had the best value (94.6%) and yield of gaseousudproducts reached 486.9, 167.8 and 22.2 mL/(g·tar) for H2, CO, CH4, respectively. The catalytic activity ofudgoethite supported Ni was better in improving tar conversion and improving increased yield of H2, CO,udCH4, which was attributed to the existence of Al/Fe substitution of goethite