Journal
CATALYSTS
Volume 9, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/catal9090719
Keywords
dehydrogenation; liquid organic hydrogen carrier; solvent deficient precipitation; mesoporous Pd-Al2O3; calcination condition
Categories
Funding
- Korea Institute of Energy Technology Evaluation and Planning - Ministry of Trade, Industry & Energy, Republic of Korea [KETEP-20173030041360]
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Republic of Korea [NRF-2019M3E6A1064908]
- Basic Science Research Program through the NRF - Ministry of Education, Republic of Korea [NRF-2016R1A6A1A03013422]
- National Research Foundation of Korea [2019M3E6A1064908] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A pair of 2-[(n-methylcyclohexyl)methyl]piperidine (H-12-MBP) and its full dehydrogenation product (H-0-MBP) has recently been considered as a potential liquid organic hydrogen carrier with 6.15 wt% H-2 storage capacity. In the discovery of an active and stable catalyst for H-2 discharge from H-12-MBP at lower temperatures, a mesoporous Pd-Al2O3 catalyst (MPdA) was synthesized by a one-pot solvent deficient precipitation (SDP). In the present work, the sensitivity and effectiveness of the SDP method are examined by varying the calcination temperature and time in the preparation of the MPdA catalyst. The characterization revealed that the final properties of the MPdA catalyst greatly rely on both the calcination temperature and time. The MPdA catalyst showed better dehydrogenation activity for calcination at 600 degrees C than at other temperatures, because of Pd particles of smaller size with higher dispersion. Although the MPdA catalysts calcined at 600 degrees C for different periods of time have similar size and dispersion of Pd particles, the dehydrogenation efficiency was superior as the calcination time became shorter (e.g., 1 h), which originated from the better arrangement of Pd particles over a higher surface area. These MPdA catalysts, irrespective of the calcination time, displayed a remarkable stability in the dehydrogenation of H-12-MBP owing to the protection of Pd particles by the Al2O3 layer.
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