以硝酸铝为氧化剂,甘氨酸作为还原剂,添加氧化钇作为改性剂,采用燃烧法合成了改性的纳米γ-Al2 O3粉体。研究了改性剂的添加量,煅烧温度,煅烧时间等工艺参数对产物的影响。以甘氨酸作为还原剂,氧化钇和硝酸铝的摩尔比为0.07∶1,煅烧温度950℃,煅烧时间4 h 的条件下制得最佳产物。对产物进行 X 射线衍射分析( XRD)、傅里叶红外光谱仪( FTIR Spectrometer)、扫描电镜分析( SEM)和比表面积分析,结果表明所得产物表面积较大,具有表面弱酸性,作为催化剂载体可以提高其表面的贵金属分散度和催化剂的抗积碳能力。
Aluminum nitrate nonahydrate was used as oxidant, the combustion agent glycine was used as reducing agent, yttria nitrate was added as modifiers, the modified nanometer γ-alumina powder was prepared by combustion synthesis. The effects of the process parameters, such as modifier dosage, calcination temperature, calcination time on the final samples were studied. The results show that the optimal process conditions of preparing γ-alumina modified by yttrium with glycine was used as combustion agent, the mole ratio of yttria nitrate, aluminum nitrate nonahydrate is 0. 07∶ 1, the calcinations temperature is 950 ℃, the calcinations time is 4 h. Through X ray diffraction analysis ( XRD ) , Fourier Transform Infrared Spectrometer ( FTIR Spectrometer ) , scanning electron microscopy ( SEM) and specific surface area analysis of the samples, the samples surface area is larger, with weak acid, as a catalyst carrier can improve the precious metal dispersion and catalyst on the surface of the ability of resistance to carbon deposition.
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