Hollow nano-particles formation for CuO-CeO2-ZrO2 via a supercritical anti-solvent process
来源期刊：JOURNAL OF RARE EARTHS2016年第11期
论文作者：姜浩锡 周佳丽 孙焕花 李永辉 张敏华
文章页码：1126 - 1133
摘 要：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.
姜浩锡1,2，周佳丽1,2，孙焕花1,2，李永辉1,2，张敏华1,2
1. Key Laboratory for Green Chemical Technology of Ministry of Education,R&D Center for Petrochemical Technology,Tianjin University
摘 要：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.
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