摘要
以介孔TiO2(m-TiO2)为载体,采用程序升温还原法制备了Ni2P/m-TiO2催化剂,考察了不同起始Ni/P摩尔比及活性组分负载量对该催化剂结构及其催化加氢脱硫(HDS)性能的影响.结果表明,当Ni/P摩尔比为1.25时,活性组分以Ni2P为主,催化剂的最佳Ni负载量为10%.采用X射线衍射、低温N2吸附-脱附、场发射扫描电镜和程序升温还原等技术表征了m-TiO2及其它不同载体负载的Ni2P催化剂.结果表明,高结晶度m-TiO2载体使Ni和P物种的还原温度大幅度降低,在450~600oC还原制得的Ni2P/m-TiO2催化剂的结构参数基本一致,比表面积均为90m2/g左右,具有很高的热稳定性和对二苯并噻吩的HDS催化性能.在相同的反应条件下,m-TiO2负载的Ni2P催化剂HDS性能最好,各载体负载的Ni2P催化剂活性大小顺序为Ni2P/m-TiO2>Ni2P/SiO2>Ni2P/P25.
Using mesoporous TiO2 (m-TiO2) as the support, novel nickel phosphide/m-TiO2 catalysts (Ni2P/m-TiO2) were prepared by a temperature-programmed reduction method. The influence of the Ni/P molar ratio and the amount of active component on the catalyst structure and the hydrodesulfurization (HDS) performance was investigated. The results indicated that the reduction of precursor with Ni/P = 1.25 yielded mainly Ni2P, and the optimum loading of Ni was 10%. The influence of m-TiO2 on the preparation and HDS performance of nickel phosphide catalysts was also evaluated by X-ray diffraction, N2 physisorption, field-emission scanning electron microscopy, and temperature-programmed reduction. The results showed that m-TiO2 with high crystallinity could dramatically decrease the reduction temperatures of Ni and P species. When the reduction temperatures were between 450 and 600 °C, the textures of the Ni2P/m-TiO2 catalysts were very similar and the specific surface areas were about 90 m2/g. The effects of the support on the dibenzothiophene HDS performance of the nickel phosphide catalysts were also investigated. The results showed that the order of dibenzothiophene conversion was Ni2P/m-TiO2 Ni2P/SiO2 Ni2P/P25.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第3期508-517,共10页
基金
国家高技术研究发展计划(863计划,2006AA03Z455)
国家自然科学基金委员会与香港研究资助局联合科研基金(20731160614)
国家重点基础研究发展计划前期研究专项(2009CB226103)
国家自然科学基金(20736002,20976080)
长江学者和创新团队发展计划(IRT0732)
江苏省高校自然科学基金(08KJB530003)
江苏省产学研联合创新资金(BY2009107)~~
关键词
介孔
二氧化钛
磷化镍
加氢脱硫
二苯并噻吩
mesoporous
titania
nickel phosphide
hydrodesulfuriztion
dibenzothiophene