バイオガスの触媒変換による炭化水素系燃料の製造(<特集>木質系燃料の現状と課題)

概要

論文の詳細を見る
Re-modified Ni-Sr/ZrO_2 catalysts were found to be effective for the reforming at 1023K-1123K of CH_4 and CO_2 in artificial biogas containing CO/H_2. But, generally, biogas before water washing contains approximately 100ppm of sulfur impurities, so reforming catalyst has to be further improved. For FT reaction, RuMn/γ-Al_2O_3 was effective under slurry-phase conditions. The effect of catalyst support was γ-Al_2O_3> α-Al_2O_3>SiO_2. FT activity was dependent on Ru and Mn concentration, where 5wt%Ru and Mn/Al=1/19 were the best results. The FT activity was not affected by CH_4 and CO_2 in biogas, but affected by impurities such as H_2S even at 5ppm. The use of carbon nanotube (tube) support for FT reaction resulted in a decreased CO conversion by 5-9% and an increased CH_4 selectivity by 5.7-11.5%, compared with γ-Al_2O_3 support. Over Mnmodified Ru/tube catalyst, however, the CO conversion at 533K remained constant after 33 hours, whereas the conversion in Ru-Mn/γ-Al_2O_3 diminished as the reaction proceeded, although the initial activity was a little higher than that of Ru-Mn/Tube. Pt/Al_<13>-montmorillonite catalyst was found to be effective for hydrocracking of FT wax to give middle distillate (C10-C20). Integrated bench-type BTL facility was constructed at Chugoku center of AIST and, at preliminary run, hydrocarbon product was successfully obtained.
一般社団法人日本エネルギー学会の論文
2008-06-20