Preparation of new cobalt phosphide and sulfide catalysts for the hydrotreating reactions
Preparation of new cobalt phosphide and sulfide catalysts for the hydrotreating reactions
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发表时间：
2021
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通讯作者：
Shen Jianyi
中科院分区：
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作者：
Yuan Yamei;Chen Hui;Zhao Danyang;Wu Chi;Geng Jiao;Shen Jianyi
A 60%Co/Al2O3 catalyst was prepared by the co⁃precipitation method. It was then reduced by H2,sulfided by CS2.and phosphided by PPh3, respectively, to metallic Co, Co9S8 and cobalt phosphides (Co2P and CoP). It was found that the.activities of these catalysts for the hydrodesulfurization (HDS) reactions followed the order of CoP/Al2O3 > Co2P/Al2O3 >.Co9S8/Al2O3 > Co(metal)/Al2O3. In addition, the phases of CoP and Co9S8 were stable (did not change) during the HDS.reactions,and CoP was significantly more active than Co9S8. On the other hand,Co2P could be converted into CoP and Co3S4.during the HDS reactions, and thus the Co2P/Al2O3 was less active than the CoP/Al2O3. The Co(metal)/Al2O3 could be.sulfided when directly used for the HDS reactions with the formation of large particles of Co9S8 (9 nm), which were.significantly larger than those in the pre ⁃ sulfided Co9S8/Al2O3 (5 nm). Thus the Co(metal)/Al2O3 was less active than the.Co9S8/Al2O3 for the HDS reactions.
