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CO2 conversion to synthesis gas via DRM on the durable Al2O3/Ni/Al2O3 sandwich catalyst with high activity and stability

Abstract

CO2 conversion to synthesis gas with CO/H2 molar ratio around 1 was realized by using dry reforming of methane reaction (DRM) at 800oC. The key problem was to design catalysts with both the high activity and the strong durability at such high reaction temperature. This work developed a novel Al2O3/Ni/Al2O3 sandwiched catalyst prepared by coating Al2O3-supported Ni nanoparticles with porous Al2O3 thin-film through atomic layer deposition (ALD). The catalyst with 80 layers of Al2O3 thin-film exhibited the highest activity. Both CO2 and CH4 conversions reached nearly 100% with absolute selectivities towards CO and H2. More importantly, this catalyst displayed excellent stability and could be used for more than 400 h in DRM reaction at 800oC without significant deactivation. Mechanism analysis revealed that the deactivation was mainly resulted from the gathering of Ni nanoparticles at high temperature, corresponding to the decrease of Ni active sites. Moreover, the large-sized Ni active site could easily cause carbon deposition, which could further accelerate the catalyst deactivation. The Al2O3/Ni/Al2O3 sandwiched catalyst could effectively protect Ni nanopaticles from gathering owing to the double strong interactions between Ni active sites and Al2O3 support.

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Publication details

The article was received on 06 Mar 2018, accepted on 26 Apr 2018 and first published on 28 Apr 2018


Article type: Paper
DOI: 10.1039/C8GC00743H
Citation: Green Chem., 2018, Accepted Manuscript
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    CO2 conversion to synthesis gas via DRM on the durable Al2O3/Ni/Al2O3 sandwich catalyst with high activity and stability

    Y. Zhao, Y. Kang, H. Li and H. Li, Green Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8GC00743H

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