【摘要】：以阿拉伯樹膠粉、阿拉伯樹膠粉和P123混合試劑為模板,以硫酸鋁為鋁源,尿素為沉淀劑,采用模板法合成納米球形氧化鋁。用XRD、IR、SEM、TEM、N2吸附脫附分析測(cè)試手段對(duì)所制取的氧化鋁進(jìn)行表征,研究合成溫度、合成時(shí)間、模板的添加量、混合模板的質(zhì)量比以及煅燒溫度對(duì)氧化鋁結(jié)構(gòu)特征的影響。實(shí)驗(yàn)表明在以阿拉伯樹膠粉為模板時(shí),合成溫度、合成時(shí)間和阿拉伯樹膠粉的添加量對(duì)氧化鋁的形貌和結(jié)構(gòu)有著較大影響。當(dāng)合成溫度為140℃,合成時(shí)間為3h,阿拉伯樹膠粉為1.0g時(shí),所制備的前驅(qū)體在600℃下煅燒2h獲得球形的氧化鋁,所制備氧化鋁顆粒的球形度較高,比表面積為184.6m3/g,平均孔徑在3.6nm和8.5nm左右。其中,孔徑較小的呈現(xiàn)集中分布,孔徑較大的分布比較寬。與阿拉伯樹膠粉作模板相比,雙模板(阿拉伯樹膠粉和P123)在水系環(huán)境下合成的氧化鋁在形貌和結(jié)構(gòu)上均表現(xiàn)不同。當(dāng)P123和阿拉伯樹膠粉的質(zhì)量比為1:1時(shí),所制備的氧化鋁形貌特征最佳,尺寸均一、分散性較好,平均孔徑在13.1nm左右,孔徑分布較寬,比表面積為159.1m2/g,孔容為0.30cm3/g。實(shí)驗(yàn)表明P123的添入有助于氧化鋁晶體結(jié)構(gòu)的發(fā)育。氧化鋁前驅(qū)體在不同煅燒溫度下制備的氧化鋁在形貌和結(jié)構(gòu)上均有一定的差異。研究表明,當(dāng)溫度為600℃時(shí),氧化鋁顆粒的形貌特征最佳,大多數(shù)為球狀,顆粒的表面光滑,孿生現(xiàn)象較低。隨著煅燒溫度的升高,產(chǎn)物從無定型態(tài)薄水鋁石轉(zhuǎn)變?yōu)棣?Al2O3,進(jìn)而轉(zhuǎn)變?yōu)棣?Al2O3。
[Abstract]:Nanometer spherical alumina was synthesized by template method using Arabic gum powder, Arabic gum powder and P123 as template, aluminum sulfate as aluminum source and urea as precipitant. The effects of synthesis temperature, synthesis time, template addition, mass ratio of mixed template and calcination temperature on the structure characteristics of alumina were studied by means of XRDX, SEM, TEMN 2 adsorption and desorption analysis. The experimental results show that the temperature, time and addition of Arabic gum powder have great influence on the morphology and structure of alumina when the Arabic gum powder is used as the template. When the synthesis temperature is 140 鈩，

本文編號(hào)：2181273