High coke-resistance MgAl2O4 islands decorated catalyst with minimizing sintering in carbon dioxide reforming of methane

作者：Son In Hyuk^*; Kwon Soonchul; Park Jong Hwan; Lee Seung Jae

来源：Nano Energy, 2016, 19: 58-67.

DOI：10.1016/j.nanoen.2015.11.007

• Carbon dioxide
• Reforming
• Steam
• MgAl2O4 island
• Carbon deposition

Carbon dioxide reforming of methane has attracted much attention as an energy production process to generate energy sources such as hydrogen and more importantly, carbon monoxide, so called syn-gas. Because carbon deposition and sintering of particles on a catalyst limit its practical application for CO2 reforming of CH4. Steam pre-treatment was performed on MgO promoted NiCo/Al2O3 (NiCoMg/Al2O3) to design MgAl2O4 islands over the catalyst surface, improving catalytic performance. During steam pre-treatment, unstable aluminum leached out, migrating to the MgO so as to form MgAl2O4 on the catalyst. Density functional theory calculations and data analysis show that the induced binding energy between MgAl2O4 and CO2 leads to the facile decomposition of CO2 thus producing oxidized layers of NiCo. These layers significantly oxidize any deposited carbon and inhibit carbon diffusion into NiCo matrix for the whisker type of carbon growth, reducing carbon deposition on the catalyst. Under severe conditions (GHSV=80,000 h(-1) at 850 degrees C), the stream treated NiCoMg/Al2O3 yielded a high conversion efficiency and high long-term stability for 3000 h without any notable carbon deposition. It is worthwhile to noting that the steam pre-treatment led to stable MgAl2O4 islands on the NiCoMg/Al2O3 catalyst preventing carbon deposition.

• 出版日期2016-1