摘要
采用程序升温还原法制备氧化铝载体负载的氮化镍钼。采用XRD、BET、H2-TPR和XPS等表征方法对氮化物的理化性质进行研究；并以噻吩和四氢萘的环己烷溶液为原料，考察氮化物作为加氢催化剂的加氢精制性能。实验结果表明，制备的负载型氮化镍钼中氮化物的晶型为Ni2Mo3N；H2-TPR表明，氮化镍钼表面钝化层的还原温度为200℃～400℃；氮化物表面Mo离子存在Mo^6＋、M^4＋、Mo^δ＋离子，Mo^δ＋离子占多数。氧化铝负载氮化镍钼具有较好的加氢脱硫初始活性和稳定性；原料中不含硫时，催化剂的加氢脱芳初始活性较好，但加氢脱芳稳定性差，原料中硫的引入加速了催化剂加氢脱芳活性的失活。
A series of alumina-supported nickel molybdenum nitrides were prepared by temperature programmed reduction successfully. Their physic-chemical properties were determined by XRD, BET, H2-TPR and XPS, and their catalytic performance were evaluated through the hydrotreating reaction with thiophene or tetralin as feedstock. Based on the results of XRD, it can be concluded that the crystalline structure of supported nickel molybdenum nitrides was Ni2Mo3N. From H2-TPR analysis, it was found that the peak at low temperature range （200 ℃ 400 ℃ ） was due to the reduction of surface oxygen on passivated nickel molybdenum nitrides. XPS results showed that there were Mo^6 ＋ , Mo^4 ＋ and Mo^δ＋ ions on the surface of supported nickel molybdenum nitrides, among which the content of Mo^δ＋ ions was the most. Nickel molybdenum nitrides catalysts had good HDS activity and stability. But their HDA stability was not satisfied, especially with the presence of sulfur.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2009年第4期459-463,共5页
Journal of Fuel Chemistry and Technology
基金
国家重点基础研究发展规划(973计划
2004CB217807)
中国石油天然气集团公司科技项目(06A50103)
关键词
程序升温
氮化镍钼
加氢精制
噻吩
四氢萘
temperature programmed reduction
nickel molybdenum nitrides
hydrotreating ： thioohene ： tetralin
