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首页> 外文期刊>Journal of industrial and engineering chemistry >Effect of urea, NH4OH, and DCCA on texture properties of alumina prepared by ultrasonic spray pyrolysis
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Effect of urea, NH4OH, and DCCA on texture properties of alumina prepared by ultrasonic spray pyrolysis

机译：尿素，NH4OH和DCCA对超声喷雾热解法制备氧化铝结构性能的影响

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摘要

Mesoporous alumina particles were prepared by using a spray pyrolysis process of aluminum nitrate precursor using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. The effects of ammonium hydroxide, urea, and drying-control-chemical agent (DCCA) on the particle morphology and pore properties of alumina particles were studied by means of N2 physical adsorption, transmission electron microscopy (TEM), and small-angle X-ray diffraction (SAXS) analysis. It was found that using urea rather than NH4OH in the spray pyrolysis is effective to increase the surface area of alumina with well-organized uniform pores. The addition of NH4OH led to decrease the surface area as well as the pore regularity. Using both DCCA and urea was a helpful way to improve the surface area, the pore volume, and the pore size distribution of alumina synthesized by spray pyrolysis. The prepared alumina particles had a broad SAXS peak without further reflection peaks indicating hexagonal or cubic symmetry. According to TEM analysis, a long-range ordering of mesopores was not observed. More details on the texture properties and the morphology of alumina particles prepared by with changing the kinds of additives in spray solution were discussed.
机译：通过使用十六烷基三甲基溴化铵（CTAB）作为结构导向剂，通过硝酸铝前体的喷雾热解工艺制备介孔氧化铝颗粒。通过N2物理吸附，透射电子显微镜（TEM）和小角X-射线法研究了氢氧化铵，尿素和干燥控制剂（DCCA）对氧化铝颗粒的形貌和孔性能的影响。射线衍射（SAXS）分析。发现在喷雾热解中使用尿素而不是NH 4 OH可有效地增加具有良好组织的均匀孔的氧化铝的表面积。 NH 4 OH的添加导致表面积以及孔规则性的减小。同时使用DCCA和尿素是改善通过喷雾热解法合成的氧化铝的表面积，孔体积和孔径分布的有用方法。所制备的氧化铝颗粒具有宽的SAXS峰，没有进一步的反射峰，表明六角对称或立方对称。根据TEM分析，未观察到中孔的远距离排序。讨论了通过改变喷雾溶液中添加剂种类而制备的氧化铝颗粒的织构性质和形态的更多细节。

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