Journal
ACS CATALYSIS
Volume 6, Issue 10, Pages 6814-6822Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b02188
Keywords
hexagonal boron nitride (h-BN); nickel; syngas methanation; core-shell; intercalation
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Funding
- National Natural Science Foundation of China [21373208, 91545204, 21321002, 11227902]
- Ministry of Science and Technology of China [2016YFA0200200, 2013CB834603, 2013CB933100]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020200]
- CAS-Shanghai Science Research Center [CAS-SSRC-YH-2015-01]
- Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Encapsulation of metal nanoparticles with porous oxide shells is a successful strategy to design catalysts with high catalytic performance. We suggest an alternative route to cover metal nanoparticles with two-dimensional (2D) material shells such as hexagonal boron nitride (h-BN), in which active metal components are stabilized by the outer shells and meanwhile catalytic reactions occur at interfaces between cores and shells through feasible intercalation of the 2D material covers. As an illustration, Ni nanoparticles encapsulated with few-layer h-BN shells were constructed and applied in syngas methanation. Ni@h-BN core-shell nanocatalysts exhibit enhanced methanation activity, higher resistance to particle sintering, and suppressed carbon deposition and Ni loss in reactions. Surface science studies in h-BN/Ni(111) model systems and chemisorption data confirm the occurrence of methanation reactions on Ni surfaces under h-BN cover. The confinement effect of h-BN shells improves Ni-catalyzed reaction activity and Ni catalyst stability.
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