期刊
CATALYSTS
卷 13, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/catal13050807
关键词
propane dehydrogenation; metal oxide; alumina; spinel
The search for inexpensive, environmentally friendly, and highly effective catalysts to activate C-H bonds in propane dehydrogenation (PDH) reactions is a major challenge. Co-based catalysts have gained attention due to their ability to activate C-H bonds and their selectivity towards olefins. However, improvements are necessary for practical utilization, specifically in terms of activity and anti-carbon deposition capacity.
The search for inexpensive, environmentally friendly, and highly effective catalysts to activate C-H bonds in propane dehydrogenation (PDH) reactions is still a major challenge. Co-based catalysts have gained significant attention in recent years due to their excellent ability to activate C-H bonds and their high selectivity towards olefins, despite being a non-noble and environmentally unfriendly metal. However, further improvements are necessary for practical utilization, particularly in terms of activity and anti-carbon deposition capacity. In this study, we synthesized Al2O3 nanorods with abundant pentacoordinated Al3+ (Al-penta(3+)) sites. The supported Co on the Al2O3 nanorod (Co/Al2O3-NR) exhibited higher selectivity (>96% propylene selectivity) and stability (deactivation rate 0.15 h(-1)) compared to Co supported on an Al2O3 nanosheet with fewer pentacoordinated Al3+ sites. Various characterizations confirmed that Co(II) mainly exists as CoAl2O4 rather than Co3O4 in the form of Co/Al2O3-NR, which inhibits the reduction of Co(II) to Co-0 and accordingly improves catalyst stability.
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