关键词: NiFe₂O₄;掺杂;氧缺位;CO₂分解, NiFe₂O₄, 掺杂, 氧缺位, CO₂分解

Abstract:

The structure of the doped ferrite prepared by mixing ions co-precipitation was characterized by XRD, TGA and H_2-TPR, and the catalytic performance of CO₂decomposition to C with its hydrogen-reduced Cr³⁺doped ferrite was evaluated. The results show that NiFe₂O₄ doped  Cr³⁺ has a single spinel structure and nano-size crystal. The results also indicate that the introduction of  Cr³⁺ into B site of the spinel structure of NiFe₂O₄could enhance its structure stability remarkably during the process of reaction cycles of H₂ reduction and CO₂ decomposition, as well as did decrease greatly the collapse rate of its structure, resulting in prolonging the reaction cycle life(over 35 cycles) and increasing carbon deposit(about 25.3%).

Key words: NiFe₂O₄; Doping; Oxygen-deficiency; CO₂ decomposition, NiFe₂O₄, Doping, Oxygen-deficiency, CO₂ decomposition