期刊
FUEL
卷 343, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2023.127918
关键词
Strong metal-support interaction; Redisperse; Oxidation; Aluminum nitride; Dry reforming of methane
Tunable strong metal-support interactions (SMSI) between nickel nanoparticles (NPs) and oxygen-free hexagonal aluminum nitride (h-AlN) have been achieved through hydrothermal-assisted degradation method. A thin Al2O3 layer is constructed on the AlN surface, which combines with NiOx species to redisperse Ni NPs in the reductive atmosphere. The strong interactions (Al2O3-Ni-AlN) build a dynamic balance between Ni0 and Ni2+ to prevent Ni oxidation toward the supporting interior. This strategy shows promising and controllable approach for industrial application of dry reforming of methane (DRM) catalysts.
Strong metal-support interactions (SMSI) occurring on oxygen-free supports have attracted significant attention in the catalysis field. The oxide layers often cover a part of the active metal sites, especially at elevated temperatures. Here, we report on tunable SMSIs between nickel nanoparticles (NPs) and oxygen-free hexagonal aluminum nitride (h-AlN) via the hydrothermal-assisted degradation method. The key to this interaction is constructing a thin Al2O3 layer on the AlN surface from the Al(OH)3 intermediate, which combines with NiOx species to redisperse Ni NPs in the reductive atmosphere. Besides, the strong interactions (Al2O3-Ni-AlN) build a dynamic balance between Ni0 and Ni2+ to prevent Ni oxidation toward the supporting interior. Al-O/Al-OH sites work synergistically with coated Ni sites to promote the dry reforming of methane (DRM) reaction. Thus, Ni/hAlN@40-3 h catalyst with a thin Al2O3 layer shows high conversion and long-term stability. This strategy may offer a promising and controllable approach for the industrial application of DRM catalysts.
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