以钴羰基簇合物为前驱体制备的钴基催化剂上F-T反应性能

Cobalt-based catalysts derived from cobalt carbonyl clusters for Fischer-Tropsch synthesis

以含羧酸配体的钴羰基簇合物Co2(CO)6HCCCOOH,Co3(CO)9CCH2COOH,Co4(CO)10HCCCOOH为前驱体,γ-Al2O3为载体,通过浸渍法制备了一系列催化剂; 同时以Co(NO3)2作为前驱体制备了参比催化剂.对制备的催化剂进行了费托反应性能评价,并用透射电子显微镜、氨程序升温脱附和傅里叶变换红外光谱等手段对催化剂进行了表征.结果发现,不同前驱体制备的催化剂对载体上Co的分布具有明显影响,进而影响催化剂活性.反应结果表明,不同前驱体制备的催化剂上CO转化率及C5+选择性顺序为Co3(CO)9CCH2COOH>Co2(CO)6HCCCOOH>Co4(CO)10HCCCOOH>Co(NO3)2.

Co catalysts supported on γ-Al2O3 were prepared using Co2（CO）6HCCCOOH, Co3（CO）9CCH2COOH, and Co4（CO）10HCCCOOH as precursors. Co（NO3）2 was used as the precursor for preparing the refer-ence catalyst. The results of Fischer-Tropsch synthesis tests and characterization by transmission electron microscopy, NH3 temperature-programmed desorption, and infrared showed that the different precursors have significant effects on the dispersion of the Co, which affect their catalytic behavior. CO conversion and C5＋ selectivity over these catalysts prepared from different precursors decreased in the order Co3（CO）9CCH2COOH 〉 Co2（CO）6HCCCOOH 〉 Co4（CO）10HCCCOOH 〉Co（NO3）2.