| WxC-MCM-48催化剂的合成、表征及加氢脱硫催化性能 |
| Synthesis, Characterization and Hydrodesulphurization Catalytic Performance of WxC-MCM-48 Catalysts |
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| 摘要: 以正硅酸乙酯(TEOS)为硅源，十六烷基三甲基溴化铵(CTAB)为表面活性剂，仲钨酸铵为钨源，采用水热晶化法一步合成了不同钨含量(以Si、W物质的量比nSi/nW表示)的WO3-MCM-48，然后经甲烷/氢气(V/V=1/4)混和气体程序升温还原碳化(TPC)，制备出了WxC-MCM-48(x=1、2)催化剂，采用XRD、N2吸附-脱附和NH3-TPD对样品的结构进行了表征，用噻吩作为模型化合物，对WxC-MCM-48催化剂的加氢脱硫催化活性进行了评价。结果表明，在一定钨含量的条件下，WO3-MCM-48和WxC-MCM-48样品仍然保持MCM-48的三维立方有序介孔结构，nSi/nW=30～15时，碳化钨的物相为W2C；nSi/nW=7.5时，碳化钨为W2C和WC物相，WxC-MCM-48催化剂表现出了良好的加氢脱硫催化性能。 |
| 关键词: 碳化钨 MCM-48 合成 XRD |
| 基金项目: |
| Abstract: A series of WO3-MCM-48 samples with different tungsten contents (silica to tungsten molar ratio) had been synthesized under hydrothermal conditions using cetyltrimethyl-ammonium bromide (CTAB) as structure-directing agent, tetraethyl orthosilicate (TEOS) as silica source and ammonium paratungstate as tungsten source. After the temperature-programmed carbonization (TPC) using CH4/ H2 mixture gases (V/V=1∶4), the WO3-MCM-48 was converted into corresponding WxC-MCM-48 (x=1, 2) catalysts. The structure of the samples was characterized by XRD, N2 adsorption-desorption and NH3-TPD. The catalytic performance of WxC-MCM-48 catalysts for the hydrodesulphurization (HDS) of thiophene was evaluated in a continuous-flow fixed-bed quartz reactor. The results indicated that both WO3-MCM-48 and WxC-MCM-48 samples were still maintained cubic ordered structure of MCM-48. In the WxC-MCM-48 catalysts, the tungsten carbide was the W2C phase when nSi/nW was from 30 to 15. However, the tungsten carbides were the W2C and WC phases when nSi/nW was 7.5. The WxC-MCM-48 catalysts exhibited a good catalytic activity for the hydrodesulphurization of thiophene. |
| Keywords: tungsten carbides MCM-48 synthesis XRD |
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| 聂平英,季生福,胡林华,吴平易,马娜.WxC-MCM-48催化剂的合成、表征及加氢脱硫催化性能[J].无机化学学报,2007,23(6):987-993. |
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