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介孔二氧化鈰納米材料的制備與性能
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綠色催化四川省高校重點實驗室開放基金(LYJ1407);成都大學(xué)校青年基金(2013XJZ06);國家青年自然科學(xué)基金(51203157)


Preparation and Properties of Mesoporous CeO2 Nanomaterials
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    摘要:

    采用化學(xué)沉淀法制備了納米氧化鈰(CeO2)儲氧材料,利用X射線衍射(XRD)分析考察了焙燒溫度對氧化鈰物相結(jié)構(gòu)的影響;利用熱重分析(TG)對沉淀物到氧化物轉(zhuǎn)變過程進行了具體分析;通過儲氧量(OSC)測定和氫氣程序升溫還原性(H2-TPR)測定及其織構(gòu)性能測定(BET法)等不同手段對CeO2材料進行了表征。結(jié)果表明:采用沉淀法制備得到的純CeO2材料屬于納米級介孔材料。該材料具有較好的抗高溫老化性能,較強的氧化還原能力,較大的比表面積和孔容及合理的平均孔徑。在1000 ℃高溫焙燒后仍然保持立方螢石結(jié)構(gòu),雖然有所燒結(jié),但仍能保持納米晶粒和納米孔結(jié)構(gòu)。

    Abstract:

    The nanoscale cerium (IV) oxide with oxygen-storage capacity was prepared by chemical precipitation. The influence of calcination temperature on phase structure was evaluated by X-ray diffraction. The mass change accompanied with the process of the precipitate converted to the oxide was analyzed by TG. In addition, the synthesized cerium (IV) oxide as oxygen-storage material was further characterized by OSC, H2-TPR and BET. The results suggest that the prepared cerium oxide is nano-scale mesoporous material with good tolerance of high temperature aging and good redox potential. Besides, oxygen storage and release capability loss is attributed to high calcination temperature. The synthesized material has large specific surface area and appropriate average pore size. The cubic fluorite structure and porous structure are kept perfectly even after calcination at 1000 oC.

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李紅梅,張云峰,梅 英,孫雁霞,鄒 強,陳偉挺,劉 榮.介孔二氧化鈰納米材料的制備與性能[J].稀有金屬材料與工程,2015,44(5):1269~1272.[Li Hongmei, Zhang Yunfeng, Mei Ying, Sun Yanxia, Zou Qiang, Chen Weiting, Liu Rong. Preparation and Properties of Mesoporous CeO2 Nanomaterials[J]. Rare Metal Materials and Engineering,2015,44(5):1269~1272.]
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  • 收稿日期:2014-05-21
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  • 在線發(fā)布日期: 2015-06-08
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