Abdollahifar Mozaffar, Haghighi Mohammad, Babaluo Ali Akbar, Talkhoncheh Saeed Khajeh
Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran; Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran.
Chemical Engineering Faculty, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran; Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran.
Ultrason Sonochem. 2016 Jul;31:173-83. doi: 10.1016/j.ultsonch.2015.12.010. Epub 2015 Dec 12.
Sono-dispersion of Ni, Co and Ni-Co over Al2O3-MgO with Al/Mg ratio of 1.5 was prepared and tested for dry reforming of methane. The samples were characterized by XRD, FESEM, PSD, EDX, TEM, BET and FTIR analyses. In order to assess the effect of ultrasound irradiation, Ni-Co/Al2O3-MgO with Co content of 8% prepared via sonochemistry and impregnation methods. The sono-synthesized sample showed better textural properties and higher activity than that of impregnated one. Comparison of XRD patterns indicated that the NiO peaks became broader by increasing Co content over the support. The FESEM images displayed the particles are small and well-dispersed as a result of sonochemistry method. Also, EDX analysis demonstrated better dispersion of Ni and Co as a result of sonochemistry method in confirmation of XRD analysis. The sono-synthesized Ni-Co/Al2O3-MgO as a superior nanocatalyst with Co content of 3% illustrates much higher conversions (97.5% and 99% for CH4 and CO2 at 850 °C), yields (94% and 96% for H2 and CO at 850 °C) and 0.97 of H2/CO molar ratio in all samples using an equimolar feed ratio at 850 °C. During the 1200 min stability test, H2/CO molar ratio remained constant for the superior nanocatalyst.
制备了Al/Mg比为1.5的Al2O3 - MgO负载Ni、Co和Ni - Co的超声分散体，并对其进行了甲烷干重整测试。通过XRD、FESEM、PSD、EDX、TEM、BET和FTIR分析对样品进行了表征。为了评估超声辐照的效果，采用声化学法和浸渍法制备了Co含量为8%的Ni - Co/Al2O3 - MgO。声化学合成的样品比浸渍法制备的样品具有更好的织构性能和更高的活性。XRD图谱比较表明，随着载体上Co含量的增加，NiO峰变宽。FESEM图像显示，由于声化学法，颗粒细小且分散良好。此外，EDX分析证实了声化学法使Ni和Co的分散性更好，这与XRD分析结果一致。声化学合成的Co含量为3%的Ni - Co/Al2O3 - MgO作为一种优异的纳米催化剂，在850℃下使用等摩尔进料比时，所有样品中CH4和CO2的转化率（分别为97.5%和99%）、H2和CO的产率（分别为94%和96%）以及H2/CO摩尔比为0.97都更高。在1200分钟的稳定性测试中，优异的纳米催化剂的H2/CO摩尔比保持恒定。
