Onestep preparation of
Mo-containing mesoporous composite and its catalytic performance
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摘要: 在强碱性条件下，通过加入辅助模板剂HAcac，制备得到高Mo掺杂的MoSiOx介孔复合材料。XRD、N2吸附脱附、ICPAES、PyFTIR表征结果表明，MoSiOx具有较规整的孔道结构、较大孔道尺寸、很大的孔容以及大的比表面积。MoSiOx中Mo物种高度分散，且载量最高可达6.3%以上。以L酸中心为主的酸分布特征使MoSiOx材料呈中强酸强酸酸性。柴油HDS性能评价结果表明，MoSiOx具有很高的柴油HDS活性，加氢后柴油中含硫化合物的质量分数低于10×10-6。对合成影响因素的分析表明，HAcac及NaOH用量对复合材料的物化性能影响很大。因此，合成时应严格控制HAcac以及NaOH的用量。Abstract: High Mo loading MoSiOx mesoporous composite was synthesized in strongly alkaline media with addition of HAcac. XRD, N2 adsorption-desorption, ICP-AES as well as Py-FTIR were used for characterization. The results show that MoSiOx composite possess regular pore structure, large pore size, very large pore volume and high specific surface area. Mo species is highly distributed in MoSiOx with a loading higher than 6.3%. The acidic sites of L types contribute to the medium strong to strong acidity of MoSiOx. Results of catalytic performances show that MoSiOx has high diesel HDS activity, and the sulfur content in the treated diesel product is lower than 10 ×10-6. Both NaOH and HAcac are key factors for MoSiOx synthesis, and the amount of NaOH and HAcac adding should be controlled strictly.
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Key words:
- MoSiOx /
- mesoporous composite /
- hydrodesulfurization /
- strongly alkaline media
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