Improving the catalytic activity in dry reforming reaction by enhancing the oxygen storage capacity of Ce0.8Zr0.2O2 support through hydrogen heat-treatment. (March 2022)

• Record Type: Journal Article
• Authors: Lee, Yeol-Lim; Kim, Beom-Jun; Park, Ho-Ryong; Ahn, Seon-Yong; Kim, Kyoung-Jin; Roh, Hyun-Seog
• Is Part Of: Journal of CO₂ utilization. Volume 57(2022)
• Publication Date: 2022-03
• Subjects: OSC Oxygen storage capacity -- DRM Dry reforming of methane -- SMSI Strong metal-support interaction -- XPS X-ray photoelectron spectroscopy -- XRD X-ray diffraction -- TGA Thermogravimetric analysis -- SEM scanning electron microscopy -- GHSV Gas hourly space velocity; Ce0.8Zr0.2O2 -- Hydrogen heat-treatment -- Oxygen storage capacity -- Ni0 dispersion -- Anchoring effect; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2022.101903
• Languages: English
• ISSNs: 2212-9820

Abstract

Abstract: We provided a different atmosphere (20% H2 /N2, N2, and ambient air) during the heat-treatment of the Ce0.8 Zr0.2 O2 support while preparing a Ni/Ce0.8 Zr0.2 O2 catalyst. The difference in heat-treatment conditions affected the physicochemical properties of the support and catalyst. In particular, it strongly affected the oxygen storage capacity (OSC) of the Ce0.8 Zr0.2 O2 support. Ni (5 wt%) was impregnated on each Ce0.8 Zr0.2 O2 support heat-treated in different atmospheres, and the characterizations of each support and catalyst were also conducted. Interestingly, the dispersion of Ni 0 in the catalyst showed a similar trend to the OSC of the support because of the anchoring effect. The dispersion of Ni 0 mainly determined the catalytic activity of the dry reforming reaction in this study, not the OSC of the Ni impregnated catalyst. The characterization and catalytic reaction results revealed a deep relationship between the OSC of the support and the dispersion of Ni 0, crystallite size of Ni 0, and catalytic activity. The catalyst prepared with the support heat-treated in 20% H2 /N2 showed the highest OSC of the support, highest Ni 0 dispersion and smallest Ni 0 crystallite size of the catalyst after impregnating Ni, resulting in the highest catalytic activity in the dry reforming reaction. This result suggests that the improvement of the catalytic activity by enhancing the OSC of the Ce0.8 Zr0.2 O2 support is possible through hydrogen heat-treatment before the impregnation of Ni. Highlights: Ce0.8 Zr0.2 O2 mixed oxide (CZO) was treated in H2 /N2, N2, and air conditions. The H2 treated CZO showed the highest oxygen storage capacity (OSC). The H2 treated CZO supported catalyst showed the highest Ni dispersion. The Ni dispersion followed the trend of support OSC due to the anchoring effect. The catalytic performance in DRM was enhanced by the H2 treatment of CZO.