微波条件下结晶γ-Al2O3的制备与表征

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探讨 了在无机 合成中 引入 微 波加 热方 式, 利用 微 波辐 射制 备 结 晶 γ Al2 O3 . 微 波 条 件下所制备 的结晶 Al( O H) 3·x H2 O, 经55 0 ℃ 焙烧 后 所得 的 γ Al2 O3( M) 与 用通 常碱 沉 淀法 所 获 得的γ Al2 O3 相比,具 有规整 、清晰的晶 貌特 征. 这 是由 于在 微 波条 件 下,水 分 子 被激 活 形成 活 性 水分子,加速了 铝溶 胶 的 溶 解 从 而 促 进 了 体 系 中 结 晶 Al( O H) 3·x H2 O 的 生 成 所 致. 借 助 于 X R D, S E M , I R 及 N H3 T P D 等 手段, 考 察 了 结 晶 γ Al2 O3 的 性 能, 结 果 表 明, 在 微 波 条 件 下 合 成 的 γ Al2 O3( M) 具 有相对 均一的孔 分布、较 小的比表 面积和孔 体积以 及较弱的 酸性. The microwave heating method was introduced in inorganic synthesis to prepare crystalline γAl 2 O 3 by microwave irradiation. Compared with the γ-Al 2 O 3 obtained by the usual alkali precipitation method, the γ Al 2 O 3 (M) obtained after calcination of the crystalline Al (O H) 3 · x H 2 O at 55 0 ° C under microwave irradiation has Regular, clear appearance characteristics. This is due to the fact that under microwave conditions, water molecules are activated to form active water molecules, which accelerate the dissolution of aluminum sol and promote the formation of crystalline Al (O H) 3 · x H 2 O in the system. The properties of crystalline γAl 2 O 3 were investigated by means of X R D, S E M, I R and N H3T P D. The results show that γAl 2 O 3 (M) synthesized under microwave irradiation has a relative Uniform pore distribution, smaller specific surface area and pore volume, and weaker acidity.
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