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首页> 外文期刊>Journal of Materials Science >Total oxidation of volatile organic compounds on Au/Ce–Ti–O and Au/Ce–Ti–Zr–O mesoporous catalysts
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Total oxidation of volatile organic compounds on Au/Ce–Ti–O and Au/Ce–Ti–Zr–O mesoporous catalysts

机译：Au / Ce–Ti–O和Au / Ce–Ti–Zr–O介孔催化剂上挥发性有机化合物的总氧化

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摘要

Cerium–titanium mixed oxides and mesoporous cerium-modified titanium and cerium-modified titanium–zirconium mixed oxides were synthesized in order to obtain active support for gold volatile organic compound (VOC) oxidation catalysts. Ce–Ti mixed oxides were synthesized by sol–gel method. Mesoporous TiO2 and Ti–Zr mixed oxides were prepared through the surfactant templating technique. Gold was loaded on supports by deposition-precipitation method. The catalysts were characterized by thermal analysis, XRD, N2 analysis, TPR, DR/UV–vis and IR. The results evidenced the beneficial role of ceria modifying additive in decreasing the degree of crystallinity of mesoporous support and its particle size. A high degree of synergistic interaction between ceria and mesoporous oxide was observed. H2-TPR revealed that the reducibility of the catalysts is greatly enhanced in the presence of gold. Considering the light off temperature, the activity of Au/mesoporous cerium-modified titanium oxide is particularly interesting for VOC oxidation comparatively to the same catalysts with a classical support. The gold particles would be more dispersed and stable. However, the sample Au/mesoporous cerium-modified titanium–zirconium mixed oxide is less interesting for VOC oxidation, particularly for toluene oxidation whose activity depends essentially on the adsorption of toluene molecule.
机译：合成了铈钛混合氧化物和介孔铈改性的钛以及铈改性钛锆混合氧化物，以便获得挥发性有机金（VOC）金氧化催化剂的活性载体。 Ce-Ti混合氧化物是通过溶胶-凝胶法合成的。通过表面活性剂模板技术制备了介孔TiO 2 和Ti-Zr混合氧化物。通过沉积-沉淀法将金负载在载体上。通过热分析，XRD，N 2 分析，TPR，DR / UV-vis和IR对催化剂进行了表征。结果证明了二氧化铈改性添加剂在降低中孔载体的结晶度及其粒度方面的有益作用。观察到二氧化铈和中孔氧化物之间的高度协同作用。 H 2 -TPR表明，在金的存在下，催化剂的还原性大大提高。考虑到起燃温度，与具有经典载体的相同催化剂相比，金/介孔铈改性的二氧化钛的活性对于VOC氧化尤为令人关注。金颗粒将更加分散和稳定。然而，样品Au /介孔铈改性的钛-锆混合氧化物对VOC氧化特别是甲苯氧化的兴趣不大，因为其活性主要取决于甲苯分子的吸附。

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