Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 19, Pages 16352-16357Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00889
Keywords
in situ exsolution; bimetallic Rh-Ni; perovskite catalyst; three-dimensionally ordered macropore; CO2 methanation
Funding
- University of New South Wales [RG142406]
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Unique CO2 methanation catalysts comprising bimetallic Ni-Rh nano-alloy/3DOM LaAlO3 have been successfully prepared via a poly(methyl methacrylate) microsphere colloidal crystal-templating route, followed by the in situ growth of Ni nanoparticles (NPs). Here, we show that unlike traditional Ni particles deposited on a perovskite support, the exsolution of Ni occurs on both the external and internal surface of the porous perovskite substrate, leading to a strong metal support interaction. Owing to the exsolution of Ni and the formation of Ni-Rh nanoalloys, a 52% enhancement in the methanation turnover frequency was obtained over the Ni-Rh/3DOM LaAlO3 [13.9 mol/(mol h)] compared to Rh/3DOM LaNi0.08Al0.92O3 [9.16 mol/(mol h)] before reduction treatment. The results show that the low-temperature reducibility, rich surface adsorbed oxygen species, and basic sites of the catalyst greatly improve its activity toward CO2 methanation. The hierarchically porous structure of the perovskite support provides a high dispersion of bimetallic Ni Rh-NPs.
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