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首页> 外文期刊>RSC Advances >Salt-induced formation of hollow and mesoporous CoOx/SiO2 spheres and their catalytic behavior in toluene oxidation
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Salt-induced formation of hollow and mesoporous CoOx/SiO2 spheres and their catalytic behavior in toluene oxidation

机译：中空和中孔CoOx / SiO2球体的盐诱导形成及其在甲苯氧化中的催化行为

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摘要

Hollow and mesoporous CoOx/SiO2 spheres (denoted as CoOx/hSiO(2) and CoOx/mSiO(2)) were synthesized via salt-assisted ultrasonic spray pyrolysis. Precursor solutions containing sodium silicate solution, a mineral acid (hydrochloric acid or nitric acid) and a cobalt salt were ultrasonically aerosolized and pyrolyzed. Results showed that CoOx/SiO2 spheres with hollow or mesoporous structure can be fabricated by using the NaCl and NaNO3 salts as in situ formed templates. Significantly, this approach avoids the need for post-calcination for template elimination, instead permitting aqueous removal with water. The influence of the sodium salts on the characteristics of CoOx/SiO2 spheres was investigated by means of XRD, nitrogen physisorption, SEM/TEM, ICP-MS, UV-Vis, XPS and H-2-TPR. On the basis of the experimental results, a possible mechanism on the formation of hollow and mesoporous spheres was proposed. The CoOx/SiO2 spheres were tested as catalysts for toluene oxidation. The mesoporous CoOx/mSiO(2) was found to exhibit superior activity to hollow CoOx/hSiO(2), probably attributed to a combination of several factors, including the predominant existence of a Co3O4 active phase, high surface Co3+ content, and easy reducibility of Co3+ at low temperature.
机译：通过盐辅助超声波喷雾热解合成中空和中孔CoOx / SiO2球体（表示为CoOX / HsiO（2）和CoOX / MSIO（2））。含有硅酸钠溶液，无机酸（盐酸或硝酸）和钴盐的前体溶液是超声波雾化和热解的。结果表明，通过使用NaCl和NaNO 3盐作为原位形成的模板，可以制造具有中空或中光结构的CoOX / SiO2球体。值得注意的是，这种方法避免了对模板消除后煅烧后的需要，而允许用水含水去除。通过XRD，氮原理吸收，SEM / TEM，ICP-MS，UV-Vis，XPS和H-2-TPR研究了钠盐对CoOX / SiO2球体特性的影响。在实验结果的基础上，提出了对中空和中孔球形成的可能机制。 CoOX / SiO2球体被测试为甲苯氧化的催化剂。发现介孔的CoOX / MSIO（2）将出现优异的活性至中空COOS / HSIO（2），可能归因于若干因子的组合，包括CO 3 O 4活性相，高表面CO3 +含量的主要存在，以及易于还原性CO3 +在低温下。

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  • 来源
    《RSC Advances》 |2016年第29期|共10页
  • 作者

    Lin Liang-Yi; Bai Hsunling;

  • 作者单位

    Washington Univ Dept Energy Environm &

    Chem Engn St Louis MO 63130 USA;

    Natl Chiao Tung Univ Inst Environm Engn Hsinchu 300 Taiwan;

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  • 正文语种 eng
  • 中图分类 化学;
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