苯加氢反应中助剂K对Ni_2Mo_3N催化剂耐硫性能的影响  

Promoting effect of potassium on sulfur resistance in benzene hydrogenation over Ni_2Mo_3N

作　　者：褚绮[1] 冯杰[1] 张丽丽[1] 徐坤[1] 谢克昌[1] 

机构地区：[1]太原理工大学煤科学与技术省部共建国家重点实验室培育基地煤科学与技术教育部和山西省重点实验室,山西太原030024

出　　处：《燃料化学学报》2015年第2期208-213,共6页Journal of Fuel Chemistry and Technology

基　　金：国家高技术研究发展计划(863计划;2011AA05A204);教育部长江学者奖励计划(2009)

摘　　要：为提高Ni2M o3N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-Ni2M o3N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Ni2M o3N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。To improve sulfur resistance of bimetallic nitrides in benzene hydrogenation reaction,K-promoted（ K-Ni2 Mo3N） catalysts were prepared to investigate the effect of potassium on sulfur resistance.K-Ni2 Mo3N expressed a higher sulfur resistance than Ni2 Mo3N 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.

关 键 词：Ni2Mo3N 助剂K 耐硫性 噻吩 苯加氢 

分 类 号：TQ519[化学工程]