ZSM-5-MCM-41复合分子筛负载NiMo双金属硫化物催化剂的制备及其加氢脱硫性能
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O643.3

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Preparation and Hydrodesulfurization Performance of ZSM-5-MCM-41 Composite Molecular Sieve Supported NiMo Bimetallic Sulfide Catalysts
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    摘要:

    以十六烷基三甲基溴化铵作为模板剂,将ZSM-5用不同浓度氢氧化钠处理脱硅,并利用重结晶法成功合成了具有较强酸性的ZSM-5-MCM-41复合分子筛〔记为ZMC-M(x), M=1.5,2.0,2.5 mol/L NaOH, x=n(SiO2)/n(Al2O3) 〕。然后,采用浸渍法制备了MoS2/ZMC和Ni-MoS2/ZMC催化剂。考察了不同NaOH处理浓度对复合分子筛ZMC结构和性质的影响。同时以噻吩/十四烷为模型化合物,考察了ZMC的硅铝比、NiMo双金属硫化物对噻吩加氢脱硫的影响。结果表明,随着NaOH浓度的增加,复合分子筛ZMC会生成更多的介孔相,但是过高的NaOH处理浓度会破坏ZSM-5的结构。因此确定了最佳NaOH处理浓度为2.0 mol/L。随着ZMC的硅铝比增加,催化剂加氢脱硫活性增加提高,并且复合分子筛负载NiMo双金属硫化物的加氢脱硫性能优于复合分子筛负载MoS2。在H2压力3 MPa、温度280 ºC、40 ml(1000 ug/L)噻吩/十四烷的条件下,20%MoS2/ZMC-2.0(70)和20%Ni-MoS2/ZMC-2.0(70)催化剂对噻吩的转化率脱硫率分别达到84.1 %和95.2 %。

    Abstract:

    ZSM-5-MCM-41 composite molecular sieve with strong acidity and different Si/Al molar ratios (denoted as ZMC-M(x), M=1.5,2.0 and 2.5 mol/L NaOH respectively, where x represented the SiO2/Al2O3 molar ratios of the mother liquid) were successfully synthesized by assembling zeolite subunits, which generated by hydrolysis of ZSM-5 in a NaOH aqueous solution using cetrimonium bromide as a template. And then MoS2/ZMC and Ni-MoS2/ZMC catalysts were prepared by impregnation method. Different NaOH treatment concentrations were examined to determine the optimum alkali treatment concentration. The effects of Si/Al molar ratio and NiMo bimetallic sulphides on the hydrodesulfurization of thiophene were also investigated using thiophene /n- tetradecane as the model compound. The results showed that with concentration of NaOH increasing the ZMC composite molecular sieve formed more mesoporous phase. However, the high concentration of NaOH treatment destroyed the structure of ZSM-5. Therefore, the optimal NaOH concentration was 2.0 mol /L. With the increase of Si/Al ratio of ZMC, the activity of hydrodesulfurization increases. Moreover, the hydrodesulfurization performance of the composite molecular sieve supported NiMo bimetallic sulfide is better than that of the composite molecular sieve supported MoS2. Under the conditions of H2 pressure of 3 MPa, temperature of 280 ºC and 40 ml (1000 ug/L) thiophene/n-tetradecane, 20%MoS2/ZMC-2.0 (70) and 20%Ni-MoS2/ZMC-2.0 (70) catalysts for the thiophene conversion rate of hydrodesulfurization rate reached 84.1% and 95.2% respectively.

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王非. ZSM-5-MCM-41复合分子筛负载NiMo双金属硫化物催化剂的制备及其加氢脱硫性能[J].精细化工,2017,34(8):

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  • 收稿日期:2016-12-08
  • 最后修改日期:2017-03-02
  • 录用日期:2017-03-06
  • 在线发布日期: 2017-07-03
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