不同钼锆质量比MoO<sub>3</sub>-ZrO<sub>2</sub>复合氧化物的结构及催化活性研究

张维; 刘晓丹; 白英芝; 王海彦; 魏民

不同钼锆质量比MoO₃-ZrO₂复合氧化物的结构及催化活性研究

张维^1,2,
刘晓丹¹,
白英芝^1,3,
王海彦^1,3,,
魏民¹

1.
辽宁石油化工大学, 辽宁抚顺 113001;
2.
沈阳化工研究院, 辽宁沈阳 110021;
3.
中国石油大学(华东), 山东青岛 266555

基金项目: 国家自然科学基金(21276253)。

详细信息

通讯作者:
王海彦,E-mail:fswhy@126.com。

中图分类号: TQ426.64
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- 文章访问数: 323
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- 被引次数: 0
出版历程
- 收稿日期: 2015-01-04
- 修回日期: 2015-03-26
- 刊出日期: 2015-08-30

Study on the structure and performance of MoO₃-ZrO₂ composite catalysts with different Mo/Zr mass ratios

1.
School of Petrochemical Engineering, Liaoning Shihua University, Fushun 113001, China;
2.
Shenyang Research Institute of Chemical Industry, Shenyang 110021, China;
3.
China University of Petroleum (Huadong), Qingdao 266555, China

摘要

摘要: 采用溶胶凝胶法制备介孔MoO₃-ZrO₂复合氧化物,考察MoO₃/ZrO₂的质量比对其晶相结构、比表面积、孔径以及形貌特征的影响。利用XRD、N₂吸附-脱附、SEM及FT-IR表征对所制得的复合氧化物进行分析。以FCC汽油馏分为原料,对MoO₃-ZrO₂经预硫化后制得的催化剂进行加氢脱硫评价。结果表明,含有MoO₃的ZrO₂与不含MoO₃的ZrO₂相比单斜相减少,主要以稳定的四方相存在。适当的提高MoO₃/ZrO₂的质量比有利于MoO₃-ZrO₂复合氧化物的比表面积和平均孔径的增大,但过大的质量比并不利于介孔的生长,并且有新的化合键和少量Zr(MoO₄)₂相产生。当MoO₃/ZrO₂的质量比为30%时,ZrO₂表面出现蠕虫状结构,此时脱硫率最高。由此,适当提高MoO₃/ZrO₂质量比可使催化剂的脱硫率升高。
- 溶胶凝胶法 /
- MoO₃-ZrO₂复合氧化物 /
- 介孔 /
- 加氢脱硫
Abstract: Mesoporous MoO₃-ZrO₂ composite oxides were prepared by sol-gel method. The influence of the mass ratio of MoO₃/ZrO₂ on the crystal phase, specific surface area, pore size and morphology characteristics were investigated. The synthesized composite oxides were characterized by XRD, BET, SEM and FT-IR. With FCC gasoline fraction as the raw material, the catalytic activity was evaluated by hydrodesulfurization reaction after the prevulcanization of the composite oxides. The results show that the ZrO₂ containing MoO₃ had less monoclinic phase than ZrO₂ and mainly existed in stable tetragonal phase. The appropriate improvement of the mass ratio of MoO₃/ZrO₂ were beneficial to the increase of specific surface area and average pore size. The excessive mass ratio of MoO₃/ZrO₂ depressed the formation of mesopores and produced a new type chemical bond and a small amount of Zr(MoO₄)₂ crystal phase. When the mass ratio of MoO₃/ZrO₂ was 30%, the worm structure appeared on the surface of ZrO₂, and the desulfurization rate reached its maximum. Thus, the appropriate improvement of the mass ratio of MoO₃/ZrO₂ could obtain a higher desulfurization rate.
- sol-gel method /
- MoO₃-ZrO₂ composite oxides /
- mesoporous /
- hydrodesulfurization

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参考文献(24)

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