抄録
To investigate the conversion of producer gas (CO+C02), the highly loaded and well-dispersed NiO/SBA-15 was prepared by a post synthesis method and a direct synthesis method. By the post synthesis method, the NiO particles were inserted into the SBA- 15 pores. The NiO/SBA-15 prepared by the post synthesis method exhibited high efficiency and sele,ctivity for methanation. The producer gas conversion for methanation was increased with increasing N10 loading. When the NiO loading exceeded 50 wt%, the ch4 selectivity was 100 % for CO_2 methanation. The highly loaded and well-dispersed NiO/SBA-15 was obtained for the first time by the direct synthesis method. By the direct method, the NiO particles were dispersed into the Si02 structure of SBA-15, unlike that prepared by the post synthesis method. The NiO/SBA-15 obtained by the direct synthesis method exhibited excellent efficiency, and selectivity for producer gas conversion to CO comparable to that obtained by the post synthesis method. The synthesis method affected the CO selectivity. The temperature and h2/co2 ratio played an important role in C02 conversion to CO, indicating that a high temperature and high h2/co2 ratio favored C02 conversion. The N10 loading did not affect the CO_2 conversion to CO. Although there was no difference in the CO selectivity when the NiO loading was increased at high temperature, it was influenced greatly by N10 loading at low temperature as a result of ch4 formation.
