Teles Aragão Campos Pablo, Vieira Lima João Pedro, de Queiroz Silva Daniele Renata, Oliveira Claudinei Fabiano, Dias Sílvia Cláudia Loureiro, Dias José Alves
Universidade de Brasília, Campus Universitário Darcy Ribeiro, Instituto de Química, Laboratório de Catálise Asa Norte Brasília-DF 70910-900 Brazil
RSC Adv. 2020 Jul 23;10(46):27428-27438. doi: 10.1039/d0ra05130f. eCollection 2020 Jul 21.
Nanostructured materials have been used in several branches of science and technology. Particulate matter is one of the major air pollution concerns. In this work, nanorods and nanoparticles of CeZrO (CZ) mixed oxides were prepared by different routes, and the use of an organic template was evaluated in diesel soot oxidation. The catalysts were characterized by several techniques including structural analysis (XRD, TEM, N adsorption-desorption) and activity (TPR/MS, TPO/MS). A fast TPR/MS method is proposed to calculate hydrogen consumption that can be correlated to the oxygen storage capacity (OSC). It was demonstrated that CZ-nanorods with twice the amount of template in the syntheses (CZ-NRs-2X) were very active for soot oxidation with at 351 °C, and CO and HO were the only oxidation products from Printex®-U (Evonik). This catalyst, reported for the first time, was subjected to up to three cycles and it showed fair activity, proving that this morphology is one of the best mixed oxides of CZ for oxidation.
纳米结构材料已应用于多个科技领域。颗粒物是主要的空气污染问题之一。在本研究中，通过不同途径制备了CeZrO（CZ）混合氧化物的纳米棒和纳米颗粒，并评估了有机模板在柴油烟灰氧化中的应用。采用多种技术对催化剂进行了表征，包括结构分析（XRD、TEM、N吸附-脱附）和活性分析（TPR/MS、TPO/MS）。提出了一种快速TPR/MS方法来计算与储氧能力（OSC）相关的氢气消耗量。结果表明，合成中模板用量为两倍的CZ纳米棒（CZ-NRs-2X）在351℃下对烟灰氧化具有很高的活性，且CO和H₂O是赢创德固赛公司Printex®-U产生的唯一氧化产物。首次报道的这种催化剂经过了多达三个循环的测试，显示出良好的活性，证明这种形态是用于氧化的CZ混合氧化物中最佳的形态之一。
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