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首页> 外文期刊>RSC Advances >CuZrO3 nanoparticles catalyst in aerobic oxidation of vanillyl alcohol
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CuZrO3 nanoparticles catalyst in aerobic oxidation of vanillyl alcohol

机译：CuZrO 3 纳米颗粒催化剂在香草醇好氧氧化中的应用

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A highly crystalline, mesoporous and perovskite type CuZrO3 nanoparticles catalyst was prepared via a simple and facile one pot solvent evaporation method. The crystal planes (112) and (211) of CuZrO3 were evidenced in HRTEM and SAED imagery by their lattice parameters, 2.83 and 3.15 ?. Also, the crystallite size of synthesized catalyst was measured in a range of 7–10 nm. The catalyst was superior as it possessed many physiochemical properties to perform a liquid phase aerobic oxidation of vanillyl alcohol to selectively produce vanillin under base free conditions. Catalytic activity of the synthesized perovskite type CuZrO3 catalyst was substantially improved by the presence of surface oxygen vacancies speculated in O 1s spectra. Furthermore, a O2-TPD technique was applied to understand the role of surface oxygen vacancy in enhancing catalytic activity. Moreover, numerous partial and full lattice dislocated grain boundaries were observed as a form of structural defects between different planes in HRTEM imagery. The redox capability of this superior catalyst was significantly enriched by the high content of Zr loading and confirmed by low temperature reduction in H2-TPR analysis. Excellent catalytic behavior of CuZrO3 (Cu:2Zr) catalyst (91% conversion and 76% selectivity to vanillin) in liquid phase aerobic oxidation was well correlated with the structural and chemical properties of the catalyst. Moreover, the catalyst was stable for four consecutive oxidation reactions without appreciable loss of catalytic activity.
机译：通过简单易行的一锅溶剂蒸发法制备了高结晶度，介孔和钙钛矿型CuZrO 3 纳米颗粒催化剂。在HRTEM和SAED图像中通过其晶格参数2.83和3.15？证明了CuZrO 3 的晶面（112）和（211）。同样，合成催化剂的微晶尺寸在7-10 nm范围内测量。该催化剂是优越的，因为它具有许多物理化学性质，可以在无碱条件下进行香草醇的液相好氧氧化，从而选择性地生产香兰素。合成的钙钛矿型CuZrO 3 催化剂的催化活性由于O 1s光谱中推测的表面氧空位的存在而大大提高。此外，应用O 2 -TPD技术了解表面氧空位在增强催化活性中的作用。此外，在HRTEM图像中，观察到许多部分和全部晶格错位的晶界，作为不同平面之间结构缺陷的一种形式。 H 2 -TPR分析表明，这种高效率催化剂的氧化还原能力因Zr含量高而显着丰富，并通过低温还原得到证实。 CuZrO 3 （Cu：2Zr）催化剂在液相好氧氧化中的优异催化性能（91％的转化率和76％的香草醛选择性）与结构和化学性质密切相关催化剂的性能。而且，该催化剂对于四个连续的氧化反应是稳定的，而没有明显的催化活性损失。

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