Promoting effect of potassium on sulfur resistance in benzene hydrogenation over Ni2Mo3N
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摘要: 为提高Ni2Mo3N在芳烃加氢过程中的耐硫性,采用络合物分解法制备以碱金属K为助剂的K-Ni2Mo3N催化剂,并应用于0.01%(质量分数)噻吩存在下的苯加氢反应体系。研究表明,电子型助剂K的添加对于Ni2Mo3N晶体结构无影响,但可以提高催化剂噻吩初始耐硫性至85%(苯转化率)。分析原因发现,碱金属助剂K改变了催化剂表面Ni物种电子状态,增加Ni原子表面电子密度,使得表面Ni呈富电子状态,削弱噻吩与Ni间相互作用。Abstract: To improve sulfur resistance of bimetallic nitrides in benzene hydrogenation reaction, K-promoted (K-Ni2Mo3N) catalysts were prepared to investigate the effect of potassium on sulfur resistance. K-Ni2Mo3N expressed a higher sulfur resistance than Ni2Mo3N when used in benzene hydrogenation with 0.01% thiophene condition. Combined XPS and H2-TPR characterization results, it could be concluded the potassium species might donate electrons to nickel species to make nickel species an electron-enriched state, which might weaken the interaction bewteen thiophene and nickel species. The TPD-MS results also confirmed the potassium species weakened the thiophene adsorption on the catalyst surface. The critical parameter of sulfur resistance are the suitable adsorption strength which could be handled by the electron condition of active site.
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Key words:
- Ni2Mo3N /
- potassium /
- sulfur resistance /
- thiophene /
- benzene hydrogenation
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