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水热法制备高纯超细CeO2-ZrO2复合氧化物 总被引:9,自引:0,他引:9
Superfine composite powders of CeO2-ZrO2 (CZ) and CeO2-ZrO2-La2O3 (CZL) were prepared by hydrothermal method. The effects of pH、temperature and time for hydrothermal process on the performance of the resulting powders were studied. The optimized reaction parameters were on follows: the precursor′s pH≈9.0, hydrothermal temperature of 200 ℃ holding for 2 h. Thermal stable powders with average particle size smaller than 10 nm and specific surface area of 171 m2·g-1 were obtained. A BET specific surface area was still at 44 m2·g-1 after calcination at 1 000 ℃ for 6 hours. 相似文献
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用吸光光度法分析了丁二烯电化学合成山梨酸的中间产物乙酰氧基己烯酸 (AA)。试验表明 ,AA测定的线性范围为 0~ 10 .1μg/ 10ml ,最大吸收波长λmax为 5 30nm ,摩尔吸光系数为 7 64× 10 4 L·mol- 1·cm- 1。催化剂CuCl最佳用量为 0 .75 μg/ 10ml ,最佳pH为 2 .7~ 3.3,温度条件为 2 7~37℃ ,水解时间为 30min ,样品测定结果满意 ,回收率达 92 .6%~ 10 3.2 %。 相似文献
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在高纯氧氯化锆制取过程中絮凝剂对“二次除硅”的影响 总被引:1,自引:0,他引:1
高纯氧氯化锆是制取高纯锆化学品的重要原材料,目前国内外多采用锆英石为原料碱熔法生产,硅的去除分两步进行:第1步是用水浸洗碱熔分解产物,大约有85%~90%的硅以硅酸钠的形式进入水浸液,余下SiO2需要“二次除硅”.因此,要生产高纯产品,“二次除硅”是... 相似文献
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