Mohammad Hosein Rezazadeh , Yalda Ramezani , Fereshteh Meshkani
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引用次数: 0
摘要
本研究探讨了基于铁促进的 MgAl2O4 的 Ni 和 Co 催化剂在二氧化碳甲烷化方面的性能,甲烷化是降低环境二氧化碳浓度的关键步骤。在超声波的帮助下,通过新型共沉淀技术对 MgAl2O4 载体进行了不同的铁负载量(5、10 和 15 wt%)改性和制造,并选择其作为 15 wt% Ni 和 Co 活性相的载体。对催化剂 BET 表面性质的研究表明,随着镍和钴催化剂铁负载量的增加,其表面积分别在 54-82 m2/g 和 73-85 m2/g 的范围内增加。在镍基催化剂中,15Ni/10FeMgAl2O4 试样的性能最好(二氧化碳转化率为 73.31%,选择性率为 95.61%),在 400 °C 下 10 小时的使用寿命也很长,原因是还原性更好,氢气消耗量增加。然而,当铁元素含量增加到 15 wt% 时,二氧化碳转化率降至 34.43%。催化结果还表明,Co/MgAl2O4 催化剂中铁的存在会对催化性能产生负面影响。未经促进的 Co/MgAl2O4 样品表现出最佳性能,在 350 °C 时的转化率达到 52.41%。
Enhancement of magnesium aluminate-based nickel and cobalt nanostructured catalysts with iron for improved performance in carbon dioxide methanation
This study investigates the performance of Ni and Co catalysts based on Fe-promoted MgAl2O4 for CO2 methanation, which is a crucial step in mitigating environmental carbon dioxide levels. The MgAl2O4 support was modified with various Fe loading (5, 10, and 15 wt%) and fabricated via a novel coprecipitation technique with the help of ultrasonic waves and chosen as support for 15 wt% Ni and Co active phases. Examination of the BET surface properties of the catalysts showed an increase in surface area in the range of 54–82 m2/g and 73–85 m2/g with an increasing Fe loading for Ni and Co catalysts, respectively. Among the Ni-based catalysts, the 15Ni/10FeMgAl2O4 specimen exhibited the best performance (with a 73.31 % CO2 conversion and 95.61 % selectivity rate) and remarkable lifetime during 10 h at 400 °C due to the better reducibility and the increase in hydrogen consumption. However, a rise in Fe amount to 15 wt% led to a reduction in the CO2 conversion to 34.43 %. The catalytic outcomes also demonstrated that the presence of Fe in Co/MgAl2O4 catalysts negatively affects catalytic performance. The unpromoted Co/MgAl2O4 sample demonstrated the best performance, achieving a conversion rate of 52.41 % at 350 °C.
期刊介绍:
Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings.
As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.