Fabrication of Highly Stable SiO2 Encapsulated Multiple CuFe Nanoparticles for Higher Alcohols Synthesis via CO Hydrogenation
Fabrication of Highly Stable SiO2 Encapsulated Multiple CuFe Nanoparticles for Higher Alcohols Synthesis via CO Hydrogenation
复制标题
制备高稳定 SiO2 封装的多重 CuFe 纳米颗粒，用于 CO 加氢合成高级醇
DOI：
10.1007/s10562-018-2329-0
复制
发表时间：
2018-04-01
影响因子：
2.8
通讯作者：
Wu, Minghong
中科院分区：
文献类型：
--
作者：
Huang, Chao;Zhang, Mingwei;Wu, Minghong
摘要采用热分解法和反相微乳液法相结合的方法制备了高稳定性的SiO2包覆的CuFe@SiO2纳米粒子。在CO加氢合成低碳醇（HAS）的实验中发现，所制备的CuFe@SiO2催化剂具有较高的CO转化率、C2+OH选择性和上级稳定性。这可能与核-壳结构的空间限制效应有关，该空间限制效应抑制了Cu-x-Fe 5C 2相的烧结和相分离，称为用于醇形成的双活性位点，这固有地改善了样品的催化性能。图形摘要CuFe@SiO2催化剂保持了Cu-χ-Fe 5C 2双活性位，没有烧结和相分离，表现出较高的上级稳定的C2+OH选择性。
AbstractHighly stable SiO2-coated multiple CuFe nanoparticles (CuFe@SiO2) were prepared by combining a facile thermal decomposition and the reverse microemulsion method. In the test of CO hydrogenation for higher alcohols synthesis (HAS), it was found that the prepared CuFe@SiO2 catalyst showed higher CO conversion, C2+OH selectivity and a superior stability than those of CuFe catalyst with time on stream. This could be related to the space confined effect of the core–shell structure that inhibited the sintering and phase separation of the Cu–χ-Fe5C2 phase, known as the dual active sites for alcohols formation, which inherently improved the catalytic performance of the sample. Furthermore, the correlation between the catalytic performance and the structural evolution was also discussed.Graphical AbstractThe CuFe@SiO2 catalysts maintained the Cu–χ-Fe5C2 dual active sites without sintering and phase separation, and thus showed the higher and superior stable C2+OH selectivity.