Abstract Large scale synthesis of catalyst with intriguing performances is a hot issue in the fields of both chemical and material science. In this paper, sub-micro sized ceria-zirconia-alumina (CZA) oxide material and that composited with halloysite (Hal) were synthesized in multi-gram scale through a simple co-precipitation method. X-ray diffraction (XRD), N2 adsorption-desorption isotherms, transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray energy dispersive spectrometer (EDS), X-ray photoelectron spectroscopy(XPS), and temperature-programmed H2 reduction (H2-TPR) were used to characterize the crystalline, textural, morphological characters, and reducibility of the products. Three-way catalytic performances of the supported products were tested in stoichiometric air/fuel condition. The samples were all composed of sub-mirco sized particles. Size of CZA was about 200 nm, while the hybrid material introduced with Hal (CZAH) showed a rod-like and sheet-like morphology consisted of agglomerated nanoparticles with size of about 100 nm. The adaption of PEG-4000 has guided the formation of nanoparticles and their self-assembly into nano-rods in the products. The Hal mineral in the composites retained their tubular morphology and penetrated into bulk of the CZA. The CZAH composite showed larger BET surface area, favorable pore structure, and better oxygen storage capacity than the CZA sample thanks to the introduction of Hal nanotubes. The supported Pd-Rh/CZAH showed the ignition temperature at about 210 °C, and converting efficiency reached near 100% for NOx and CO before 230 °C in TWC tests, which also showed the optimized catalytic performances than CZA matrix.

中文翻译：

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大规模合成具有增强催化性能的亚微米级埃洛石组成的 CZA

摘要 大规模合成性能优异的催化剂是化学和材料科学领域的热点问题。在本文中，通过简单的共沉淀方法以多克规模合成了亚微米级氧化铈-氧化锆-氧化铝（CZA）氧化物材料和与埃洛石（Hal）复合的材料。X 射线衍射 (XRD)、N2 吸附-解吸等温线、透射电子显微镜 (TEM)、扫描电子显微镜 (SEM)、X 射线能谱仪 (EDS)、X 射线光电子能谱 (XPS) 和温度-程序化 H2 还原 (H2-TPR) 用于表征产品的结晶、质地、形态特征和还原性。在化学计量空气/燃料条件下测试了负载产物的三元催化性能。样品均由亚微米尺寸的颗粒组成。CZA 的尺寸约为 200 nm，而引入 Hal (CZAH) 的混合材料显示出棒状和片状形态，由尺寸约为 100 nm 的团聚纳米颗粒组成。PEG-4000 的适应指导了纳米粒子的形成及其在产品中的自组装成纳米棒。复合材料中的 Hal 矿物保留了它们的管状形态并渗透到 CZA 的主体中。由于引入了 Hal 纳米管，CZAH 复合材料显示出比 CZA 样品更大的 BET 表面积、有利的孔结构和更好的储氧能力。在 TWC 测试中，负载的 Pd-Rh/CZAH 的着火温度约为 210 °C，在 230 °C 之前，NOx 和 CO 的转化效率接近 100%，