Hollow nano-particles formation for CuO-CeO₂-ZrO₂ via a supercritical anti-solvent process

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• 作者：Haoxi JIANG (姜浩锡)^a ; ^b ; Jiali ZHOU (周佳丽)^a ; ^b ; Huanhua SUN (孙焕花)^a ; ^b ; Yonghui LI (李永辉)^a ; ^b ; ^{liyh@tju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Minhua ZHANG (张敏华)^a ; ^b
• 关键词：supercritical anti-solvent (SAS) ; CuO-CeO2-ZrO2 ; nano-particulate ; hollow structure ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：34
• 期：11
• 页码：1126-1133
• 全文大小：4648 K

文摘

Hollow CuO-CeO₂-ZrO₂ nano-particles were prepared with supercritical anti-solvent apparatus by using methanol as solvent and supercritical carbon dioxide as anti-solvent. Two key factors (i.e., pressure and temperature) were investigated to explore the effects of catalyst structure and physic-chemical properties (i.e., morphology, reducing property, oxygen storage capacity and specific surface area). The resulting materials were characterized with X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller (BET), hydrogen temperature programmed reduction (H₂-TPR) and oxygen storage capacity (OSC) measurement, respectively. The experimental results showed that lower temperatures promoted production of hollow structure nano-particulates. The particle morphology also changed significantly, i.e. the solid construction was first transferred to hollow structure then back to solid construction. The optimal conditions for obtaining hollow nano-particles were determined at 45 °C, 18.0–24.0 MPa.