Effects of reduction on the catalytic performance of limonite ore

• 来源期刊: 能源化学
• 年，卷（期）: 2018,（5）
• 页码范围: 1489-1495
• 页数: 7页
• 语种: 英文

摘要

The catalytic performance of Ni-containing limonite ore in the dry reforming reaction of methane (CH4+CO2→2H2+2CO) was determined before and after hydrogen reduction,and under a flow of hydrogen.After hydrogen reduction,the limonite ore exhibited higher catalytic performance,because of the formation of Fe-Ni.However.the Fe in Fe-Ni was readily oxidized by the input CO2 gas,resulting in a rapid decrease in the catalytic performance of limonite ore.The performance decrease was due to a decrease in the Ni surface area;Ni could not dissolve in iron oxides and this caused segregation in the iron oxides.When the reaction was conducted under a hydrogen flow, the Fe-Ni was formed and maintained.Ni was highly dispersed in the Fe-Ni phase,resulting in greater surface area of Ni and higher conversion rate of CH4 and CO2.The catalytic performance of the limonite ore was inferior to the Ni/Al2O3 catalyst because the effect of catalyst support was small,however,the limonite ore was more stable during catalytic use and much cheaper than the Ni/Al2O3.