Al-Fatesh Ahmed S, Kumar Rawesh, Fakeeha Anis H, Kasim Samsudeen O, Khatri Jyoti, Ibrahim Ahmed A, Arasheed Rasheed, Alabdulsalam Muhamad, Lanre Mahmud S, Osman Ahmed I, Abasaeed Ahmed E, Bagabas Abdulaziz
Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia.
Sankalchand Patel University, Visnagar, Gujarat, 384315, India.
Sci Rep. 2020 Aug 17;10(1):13861. doi: 10.1038/s41598-020-70930-1.
The generation of synthesis gas (hydrogen and carbon monoxide mixture) from two global warming gases of carbon dioxide and methane via dry reforming is environmentally crucial and for the chemical industry as well. Herein, magnesium-promoted NiO supported on mesoporous zirconia, 5Ni/xMg-ZrO (x = 0, 3, 5, 7 wt%) were prepared by wet impregnation method and then were tested for syngas production via dry reforming of methane. The reaction temperature at 800 °C was found more catalytically active than that at 700 °C due to the endothermic feature of reaction which promotes efficient CH catalytic decomposition over Ni and Ni-Zr interface as confirmed by CH-TSPR experiment. NiO-MgO solid solution interacted with ZrO support was found crucial and the reason for high CH and CO conversions. The highest catalyst stability of the 5Ni/3Mg-ZrO catalyst was explained by the ability of CO to partially oxidize the carbon deposit over the surface of the catalyst. A mole ratio of hydrogen to carbon monoxide near unity (H/CO ~ 1) was obtained over 5Ni/ZrO and 5Ni/5Mg-ZrO, implying the important role of basic sites. Our approach opens doors for designing cheap and stable dry reforming catalysts from two potent greenhouse gases which could be of great interest for many industrial applications, including syngas production and other value-added chemicals.
通过干重整由二氧化碳和甲烷这两种全球变暖气体生成合成气（氢气和一氧化碳混合物）对环境至关重要，对化学工业也很重要。在此，采用湿浸渍法制备了负载在介孔氧化锆上的镁促进的NiO，即5Ni/xMg-ZrO（x = 0、3、5、7 wt%），然后通过甲烷干重整测试其合成气生产性能。由于反应的吸热特性，促进了Ni和Ni-Zr界面上CH的有效催化分解，CH-TSPR实验证实，800℃的反应温度比700℃更具催化活性。发现NiO-MgO固溶体与ZrO载体相互作用至关重要，这是CH和CO高转化率的原因。5Ni/3Mg-ZrO催化剂的最高催化剂稳定性可通过CO部分氧化催化剂表面积炭的能力来解释。在5Ni/ZrO和5Ni/5Mg-ZrO上获得了接近1的氢与一氧化碳摩尔比（H/CO ~ 1），这意味着碱性位点的重要作用。我们的方法为从两种强效温室气体设计廉价且稳定的干重整催化剂打开了大门，这可能对许多工业应用非常有意义，包括合成气生产和其他增值化学品。
