Effects of reduction on the catalytic performance of limonite ore

作     者：Keisuke Abe Ade Kurniawan Takahiro Nomura Tomohiro Akiyama 

作者机构：Graduate school of Engineering Hokkaido University Sapporo 060-8628 Japan Center for Advanced Research of Energy and Materials Hokkaido University Sapporo 060-8628 Japan 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2018年第27卷第5期

页      面：1489-1495页

核心收录：

学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the Grant-in-Aid for Research Fellow of Japan Society for the Promotion of Science 

主　　题：Limonite Dry reforming Fe-Ni Catalyst 

摘      要：The catalytic performance of Ni-containing limonite ore in the dry reforming reaction of methane （CH_4＋CO_2→2H_2＋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 CO_2 gas. resulting in a rapid decrease in the catalytic performance of limonite ore. The performance de- crease 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 CH_4 and CO_2. The catalytic performance of the limonite ore was inferior to the Ni/Al_2O_3 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/Al_2O_3.