Environment Functional Materials Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China.
Institute of Materials, China Academy of Engineering Physics, Mianyang 621900, P. R. China.
Sci Rep. 2017 Feb 2;7:41797. doi: 10.1038/srep41797.
Palladium nanoparticles were grown on sub-millimeter activated AlO particle support by spraying HPdCl solution evenly onto the support, followed with a thermal reduction under H atmosphere. Compared with its counterpart created by the conventional impregnation method, the Pd/AlO catalyst created by the spray process could enrich the existence of active Pd nanoparticles on the surface of the catalyst support and increase their degree of dispersion, resulting in a much higher activity in the catalytic reduction of bromate in water. The effect of AlO support particle size on the bromate removal rate was also investigated, which demonstrated that smaller support particle size could have higher activity in the catalytic reduction of bromate in water because of its larger exposed surface. This Pd/AlO catalyst could be easily used in the fixed bed reactor due to its large support size and demonstrated excellent stability in the catalytic reduction of bromate in mineral water. This Pd/AlO catalyst also exhibited a good catalytic reduction performance on azo dyes as demonstrated by its effective catalytic hydrogenation of methyl orange. Thus, catalysts prepared by the spray method developed in this work could have the potential to be used in fixed bed reactors for various water treatment practices.
钯纳米粒子通过将 HPdCl 溶液均匀喷洒在亚毫米级活化 AlO 颗粒载体上，然后在 H 气氛下进行热还原，从而在亚毫米级活化 AlO 颗粒载体上生长。与通过传统浸渍法制备的对应物相比，通过喷雾工艺制备的 Pd/AlO 催化剂可以在催化剂载体表面富集存在的活性 Pd 纳米粒子，并增加其分散度，从而在水中催化还原溴酸盐方面表现出更高的活性。还研究了 AlO 载体颗粒大小对溴酸盐去除率的影响，结果表明，由于较小的载体颗粒具有较大的暴露表面积，因此在水中催化还原溴酸盐的活性更高。由于其较大的载体尺寸，该 Pd/AlO 催化剂可轻松用于固定床反应器，并在矿泉水中催化还原溴酸盐方面表现出优异的稳定性。该 Pd/AlO 催化剂在偶氮染料的催化还原性能方面也表现出良好的性能，如对甲基橙的有效催化加氢。因此，本工作中开发的喷雾法制备的催化剂有可能用于各种水处理实践的固定床反应器。
