Impact of Coordination Features of Co(II)-Glycine Complex on the Surface Sites of Co/SiO2 for Fischer–Tropsch Synthesis
Impact of Coordination Features of Co(II)-Glycine Complex on the Surface Sites of Co/SiO2 for Fischer–Tropsch Synthesis
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DOI：
10.3390/catal10111295
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发表时间：
2020-11
期刊：
影响因子：
3.9
通讯作者：
Qingqing Hao;Hu Min;Zhiqun Xie;Xiaoxun Ma;Wei Wang;H. Ren
中科院分区：
文献类型：
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作者：
Qingqing Hao;Hu Min;Zhiqun Xie;Xiaoxun Ma;Wei Wang;H. Ren
为了研究Co（II）-甘氨酸配合物的配位特征对Co/SiO2催化剂用于费托合成（FT）的性能的影响，采用常规方法制备Co（II）-甘氨酸配合物前驱体，在硝酸钴溶液中简单加入甘氨酸，甘氨酸与氢氧化钴的反应。采用不同的Co（II）-甘氨酸配合物制备了SiO2负载的Co催化剂。结果表明，当甘氨酸与Co ~（2+）的摩尔比为3时，甘氨酸是一种有效的螯合剂，可以提高Co的分散性和FT合成的质量比活性，且与制备方法无关。值得注意的是，表面Co的性能显着影响的Co（II）-甘氨酸配合物中的Co2+和甘氨酸的摩尔比的Co2+的配位功能。具体地，通过新路线制备的Co（3gly）/SiO2催化剂表现出更小和均匀的Co纳米颗粒，这导致与通过常规方法制备的Co-3gly/SiO2相比改善的稳定性。因此，新开发的方法是更可控的和有前途的合成钴基催化剂用于FT合成。
To investigate the effect of coordination features of Co(II)-glycine complex on the performance of Co/SiO2 for Fischer–Tropsch (FT) synthesis, Co(II)-glycine complex precursors were prepared by the conventional method, i.e., simply adding glycine to the solution of Co nitrate and novel route, i.e., reaction of glycine with cobalt hydroxide. The SiO2-supported Co catalysts were prepared by using the different Co(II)-glycine complexes. It is found that glycine is an effective chelating agent for improving the dispersion of Co and the mass-specific activity in FT synthesis when the molar ratio of glycine/Co2+ = 3, which is independent to the preparation method in this study. Significantly, the surface Co properties were significantly influenced by the coordination features of the Co2+ and the molar ratio of glycine to Co2+ in the Co(II)-glycine complex. Specifically, the Co(3gly)/SiO2 catalyst prepared by the novel route exhibits smaller and homogenous Co nanoparticles, which result in improved stability compared to Co-3gly/SiO2 prepared by the conventional method. Thus, the newly developed method is more controllable and promising for the synthesis of Co-based catalysts for FT synthesis.