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以介孔分子筛SBA-15为载体,通过分步浸渍硝酸镍、磷酸氢二铵、钼酸铵,然后在H2气流下程序升温还原(H2-TPR),制备了一系列不同Mo含量的Mo-Ni2P/SBA-15催化剂.采用X射线衍射(XRD)、氮气吸脱附(BET)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)对催化剂的结构进行了表征,评价了催化剂对二苯并噻吩(DBT)的加氢脱硫(HDS)活性.结果表明,Mo-Ni2P/SBA-15催化剂仍然保留有介孔结构,催化剂的物相主要是Ni2P.催化剂表面的Ni以Niδ+和Ni2+形式存在;P以Pδ-和P5+形式存在;Mo以Moδ+和Mo6+形式存在.Mo能促进催化性能的提高,其中Mo含量为1%(w,质量分数)的Mo-Ni2P/SBA-15催化剂具有最好的二苯并噻吩加氢脱硫催化活性,在反应温度为380°C,反应压力为3.0 MPa的条件下,二苯并噻吩的转化率可达99.03%,所有考察的Mo-Ni2P/SBA-15都以直接加氢脱硫(DDS)途径为主.
The mesoporous molecular sieve SBA-15 was used as a carrier to prepare a series of Mo-Mo catalysts by stepwise impregnation of nickel nitrate, diammonium hydrogen phosphate and ammonium molybdate followed by temperature-programmed reduction (H2-TPR) Ni2P / SBA-15 catalyst.The structure of the catalyst was characterized by X-ray diffraction (XRD), nitrogen adsorption and desorption (BET), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) (HDS) activity of dibenzothiophene (DBT) was studied.The results showed that the mesoporous structure of Mo-Ni2P / SBA-15 catalyst remained and the main phase of the catalyst was Ni2P.Ni8 + Ni exists in the form of P 2 - and P 5+, Mo exists in the form of Mo δ + and Mo 6+, and Mo can promote the improvement of catalytic performance. Mo-Ni 2 P / SBA-15 with Mo content of 1% The catalyst has the best catalytic activity of dibenzothiophene hydrodesulfurization. Under the conditions of reaction temperature of 380 ° C and reaction pressure of 3.0 MPa, the conversion of dibenzothiophene can reach 99.03%. All the investigated Mo-Ni2P / SBA-15 are mainly direct hydrodesulfurization (DDS) approach.