引用本文:
管洪波, 王培, 王晖, 赵璧英, 朱月香, 谢有畅. 高比表面纳米M 的制备及其影响因素研究[J]. 物理化学学报,
2006, 22(07): 804-808.
doi:
10.1016/S1872-1508(06)60033-8
Citation: GUAN Hong-Bo, WANG Pei, WANG Hui, ZHAO Bi-Ying, ZHU Yue-Xiang, XIE You-Chang. Preparation of Nanometer Magnesia with High Surface Area and Study on the Influencing Factors of the Preparation Process[J]. Acta Physico-Chimica Sinica, 2006, 22(07): 804-808. doi: 10.1016/S1872-1508(06)60033-8
Citation: GUAN Hong-Bo, WANG Pei, WANG Hui, ZHAO Bi-Ying, ZHU Yue-Xiang, XIE You-Chang. Preparation of Nanometer Magnesia with High Surface Area and Study on the Influencing Factors of the Preparation Process[J]. Acta Physico-Chimica Sinica, 2006, 22(07): 804-808. doi: 10.1016/S1872-1508(06)60033-8
高比表面纳米M 的制备及其影响因素研究
摘要:
在溶液中采用不同的原料制备了三种前体MgC2O4•2H2O, 经高温焙烧得到高比表面M . 用XRD、BET、TEM和TG-DTA等表征手段对前体及产物M 进行了表征. 结果表明, 以醋酸镁和草酸为原料制备前体草酸镁并在焙烧过程中消除水汽的影响是得到高比表面M 的关键. 最优条件下制备的样品经520 ℃焙烧后比表面积高达534 m2•g−1, 晶粒尺寸仅为4～5 nm的M 粒子堆积成一定程度上长程有序的介孔结构, 并具有十分优良的抗高温烧结性能. 650 ℃和800 ℃焙烧2 h后, 其比表面积仍分别高达229 m2•g−1和134 m2•g−1.
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关键词:
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纳米M ;草酸镁;高比表面积;孔结构
English
Preparation of Nanometer Magnesia with High Surface Area and Study on the Influencing Factors of the Preparation Process
Abstract:
Three kinds of MgC2O4•2H2O were prepared by precipitation method with different raw materials, and M with high surface area was obtained via thermal decomposition of MgC2O4•2H2O in different atmospheres. The precursor MgC2O4•2H2O and as-prepared M were characterized by XRD, BET, TEM, and TG-DTA measurements. It was found that using Mg(CH3COO)2•4H2O and H2C2O4•2H2O as the starting materials and calcining the precursor MgC2O4•2H2O in flowing dry gas are key factors to obtain high surface area M . The M prepared at the optimum condition is composed of nanocrystals with a size about 4~5 nm and forms a wormhole-like porous structure with a specific surface of 534 m2•g−1 after calcining at 520 ℃. In addition, the M has od thermal stability, after calcining at 650 ℃ and 800 ℃ for 2 h, its surface area is still 229 m2•g−1 and 134 m2•g−1, respectively.
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