掺杂铁酸盐的制备、结构及其催化分解CO_2成C的性能

Preparation,Structure of Doped Ferrite and Its Performance of Decomposition of Carbon Dioxide to Carbon

采用混合离子共沉淀法制备掺杂铁酸盐,采用XRD,TGA和H2-TPR等手段对其结构进行了表征,并考察了其直接催化分解CO2成C的性能.研究结果表明,用混合离子共沉淀法能够制备出纳米级晶粒、且为单一尖晶石结构的Cr3+掺杂的N iFe2O4.所掺杂的Cr3+进入N iFe2O4的晶格B位,极大地促进了N iFe2O4在还原氧化过程中结构的稳定性,分解CO2反应后,N iFe2O4的结构易恢复,从而明显地提高了其分解CO2成C反应的循环寿命(35次以上)和积炭量(25.3%).

The structure of the doped ferrite prepared by mixing ions co-precipitation was characterized by XRD, TGA and Hz-TPR, and the catalytic performance of CO2 decomposition to C with its hydrogen-reduced Cr^3＋ doped ferrite was evaluated. The results show that NiFe204 doped Cr^3＋ has a single spinel structure and nano-size crystal. The results also indicate that the introduction of Cr^3＋ into B site of the spinel structure of NiFe2O4 could enhance its structure stability remarkably during the process of reaction cycles of H2 reduction and COzdecomposition, 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% ）.