【摘要】 以NH₄Al（SO₄）₂和NH₄HCO₃为主要原料,采用均相沉淀法制备纳米Al₂O₃前驱体NH₄AlO （OH）HCO₃（AACH）,研究了滴定速率对其制备的影响。结果表明:将硫酸铝铵溶液滴入剧烈搅拌的碳酸氢铵溶液中,滴定速率不同,产物的组成和尺寸大小不同。滴定速率较低时,产物为晶化完全、纯净的AACH相,滴定速率较高时,产物中含有极少γ- AIOOH,而且滴定速率越低,所得前驱体尺寸越小。更多还原

【Abstract】 NH₄ AlO（OH）HCO₃,the precursor of nano- Al₂ O₃,was prepared by homogeneous precipitation meth- od using NH₄Al（SO₄）₂ and NH₄ HCO₃ as raw materials.Effects of titration speed on preparing precursors were identified in the paper.The results indicate that titration speed has a great influence on preparing precursors. Nano-NH₃AlO（OH） HCO₃ is prepared by adding an aqueous solution of NH₄ Al（SO₄）₃ drop by drop to an aque- ous solution of NH₄HCO₃ at a titration speed of 3ml/min.When titration speed is low,the product is pure AACH crystals.When titration speed is high,the product containsγ-AlOOH little.And titration speed is low- er,the size of precursors is smaller.更多还原