期刊
JOURNAL OF CO2 UTILIZATION
卷 57, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2022.101903
关键词
Ce0.8Zr0.2O2; Hydrogen heat-treatment; Oxygen storage capacity; Ni-0 dispersion; Anchoring effect
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIT) [2020R1A2B5B01002346, 2021R1C1C2005231]
- National Research Foundation of Korea [2021R1C1C2005231, 2020R1A2B5B01002346] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigates the effect of heat-treatment conditions on the physicochemical properties of the support and catalyst, and reveals the important relationship between the oxygen storage capacity of the support and the catalytic activity of the catalyst.
We provided a different atmosphere (20% H-2/N-2, N-2, and ambient air) during the heat-treatment of the Ce0.8Zr0.2O2 support while preparing a Ni/Ce0.8Zr0.2O2 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 Ce(0.8)Zr(0.2)O(2 )support. Ni (5 wt%) was impregnated on each Ce0.8Zr0.2O2 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% H-2/N-2 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 Ce0.8Zr0.2O2 support is possible through hydrogen heat-treatment before the impregnation of Ni.
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