Journal
CATALYSTS
Volume 12, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/catal12121542
Keywords
steam reforming; multiple metal support interactions; hierarchically ordered macroporosity; nickel dispersion; steam cracking
Categories
Funding
- National Research Foundation of Korea (NRF) grant - Korea government (MSIT) [2020R1A4A4079954, 2021R1A2B5B01001448]
- Regional Innovation Strategy (RIS) program through the NRF - Ministry of Education (MOE) [2021RIS-003-1345341781]
- National Research Foundation of Korea [2021R1A2B5B01001448] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, the effect of hierarchically ordered macroporous structure of alumina support on the catalytic performance of steam reforming was investigated. The results showed that the hierarchically ordered macroporosity can maintain high Ni dispersion and improve the catalytic performance. At high potassium content, the decrease in Ni active sites resulted in a decrease in steam reforming rate. However, the potassium-alumina interaction can diminish the formation of inactive phases and maintain highly dispersed Ni active sites, leading to a high steam reforming rate.
In this study, we investigate the effect of a hierarchically ordered macroporous structure of alumina support on the steam reforming of 1-methyl naphthalene with mesoporous alumina-supported nickel and potassium (xK/Ni-MeAl), and macroporous alumina-supported nickel and potassium (xK/Ni-MaAl) catalysts. Hierarchically ordered macroporosity in Al2O3 supports plays an important role in maintaining the high Ni dispersion through multiple interactions in Ni-K over AlO4 tetrahedra in alumina. This, in turn, improves the catalytic performance of steam reforming, including high gas yields, turnover frequency for hydrogen production, and 1-methyl naphthalene conversion. At high K content, the Ni active sites over xK/Ni-MeAl catalysts significantly decrease, resulting in almost zero steam reforming rate in the reaction test. Conversely, the potassium-alumina interaction in xK/Ni-MaAl catalysts not only diminishes the formation of the inactive nickel aluminate phase but also maintains the highly dispersed Ni active sites, resulting in a high steam reforming rate.
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