HYDROXY ACID-AIDED SYNTHESIS OF PEROVSKITE-TYPE OXIDES WITH LARGE SURFACE-AREAS
HYDROXY ACID-AIDED SYNTHESIS OF PEROVSKITE-TYPE OXIDES WITH LARGE SURFACE-AREAS
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DOI：
10.1016/0925-8388(93)90313-c
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发表时间：
1993-03-15
影响因子：
6.2
通讯作者：
KAGAWA, S
中科院分区：
文献类型：
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作者：
TERAOKA, Y;KAKEBAYASHI, H;KAGAWA, S
采用羟基酸辅助工艺合成了钙钛矿型La0.8Sr0.2MO3 （M = Mn, Co）化合物，该工艺由金属硝酸盐与羟基酸混合水溶液的蒸发-干燥步骤组成，然后在空气中煅烧。当使用柠檬酸或苹果酸时，在550-600℃下形成良好结晶的钙钛矿型氧化物，比传统硝酸盐工艺的温度低250-300℃。苹果酸辅助氧化得到的氧化物比柠檬酸辅助氧化得到的氧化物具有更大的比表面积，所得到的大比表面积氧化物对甲烷的燃烧表现出优异的催化性能。
Perovskite-type La0.8Sr0.2MO3 (M = Mn, Co) compounds were synthesized by a hydroxy acid-aided process which was composed of the evaporation-to-dryness step of the mixed aqueous solution of metal nitrates and a hydroxy acid, followed by calcination in air. When citric or malic acid was used, well-crystallized perovskite-type oxides were formed at 550-600-degrees-C, which was 250-300-degrees-C lower than the temperature for the conventional nitrate process. The malic acid-aided process gave oxides with larger specific surface areas than those obtained with the citric acid-aided process, and the resulting large surface area oxides showed excellent catalytic performance for the combustion of methane.