TiO2载体特性对二苯并噻吩加氢脱硫性能的影响

以自制的大比表面介孔二氧化钛晶须作为加氢脱硫催化剂的载体,采用一步浸渍法制备了MoO₃-NiO/TiO₂催化剂,并用 X 射线衍射、N₂ 吸附-脱附、SEM、拉曼衍射等技术对载体和催化剂进行了表征,考察了TiO₂晶须材料作为二苯并噻吩(DBT)上加氢脱硫(HDS)催化剂载体的性能及优越性,并详细考察了不同TiO₂载体的晶型与比表面积对催化剂加氢脱硫反应活性的影响。结果表明,TiO₂介孔晶须具有较为活泼的锐钛矿相和晶须形貌,同时提供了大的比表面积和特殊的孔道结构,在温度280℃、氢分压2.0 MPa、氢/油体积比400、体积空速4 h^-1的温和条件下,DBT转化率即可接近100%。比表面积相近时,催化剂的脱硫效果依次为锐钛矿相>混晶>金红石相;同为锐钛矿相TiO₂载体,催化剂的脱硫效果随着比表面的增大而增加。

Effect of characteristics of TiO2 carrier on performance of dibenzothiophene hydrodesulfurization

An attempt using self-regulating mesoporous titanium dioxide whisker as catalyst carrier of hydrogen desulfurization,was carried out to prepare MoO₃-NiO/TiO₂ catalyst by single-step incipient wetness impregnation.X-ray,N₂ absorption/desorption,SEM,Raman diffraction were adopted to characterize the carrier and catalyst.The effect of mesoporous TiO₂ whisker as catalyst carrier on the performance of dibenzothiophene (DBT)hydrogen desulfurization (HDS)was evaluated.The results showed that the mesoporous TiO₂ whisker had highly active anatase,whisker morphology and larger specific surface area as well as special pore structure.DBT conversion over mesoporous TiO₂ whisker could approach 100% under moderate conditions of reaction temperature 280℃,hydrogen partial pressure 2.0 MPa,hydrogen/oil volume ratio 400 and LHSV 4 h^-1.Under the condition of similar specific surface area,the sequence of the desulfurization effect of the tested catalysts was anatase> mixed crystals of TiO₂ >rutile.As anatase carriers are concerned,the desulfurization effect increased with the increase of the specific surface area of TiO₂ carrier.