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通过溶液燃烧法,以硝酸铝、硝酸钡为氧化剂,不同的燃烧剂(甘氨酸、柠檬酸、尿素)作为还原剂,制备了钡改性的γ-Al2O3。对产物作XRD、SEM表征并对前驱体作TG-DTA表征,研究了不同燃烧剂、改性剂(硝酸钡)的添加量、煅烧温度、煅烧时间等工艺参数对合成产物相组成和形态的影响。结果表明,合成钡改性的γ-Al2O3的最佳工艺条件为:以甘氨酸为燃烧剂、添加3%的硝酸钡、煅烧温度为1000℃、煅烧时间为4 h。
Barium-modified γ-Al2O3 was prepared by solution combustion method using aluminum nitrate and barium nitrate as oxidants and different combustion agents (glycine, citric acid and urea) as reducing agents. The products were characterized by XRD and SEM. The precursors were characterized by TG-DTA. The effects of different combustion agents, modifier (barium nitrate), calcination temperature and calcination time on the phase composition and morphology influences. The results showed that the optimal conditions for the synthesis of barium-modified γ-Al2O3 were as follows: glycine as fuel, 3% barium nitrate, calcination temperature 1000 ℃ and calcination time 4 h.