Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 310, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110588
Keywords
Nano-dispersion; Anchoring site; Graphene support; Low-temperature catalyst; NH3-Selective catalytic reduction
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Funding
- Ministry of Trade, Industry and Energy, South Korea (MOTIE) [20005721]
- Ministry of Science and ICT, South Korea (MSIT) [EO200014]
- National Research Council of Science & Technology (NST), Republic of Korea [EO200014] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study improves the dispersion of catalytically active materials on graphene support through nitrogen doping, enhancing the stability and conversion efficiency of catalysts.
In this study, we use nitrogen-doped reduced graphene oxide as a catalyst support for selective catalytic reduction (SCR) and extend its application to various catalysts by synthesizing graphene supports with high thermal stability and abundant surface functional groups. In order to clarify the role of graphene support, we used three supports, viz., graphene oxide (GO) and two N-doped reduced graphene oxide (N-rGO) samples ob-tained using two different doping agents, NH4NO3 and NH4OH. The dispersion of the catalytically active materials on the graphene support improved with nitrogen doping, as confirmed by the results of X-ray photoelectron spectroscopy and transmission electron microscopy, the texture properties evaluated by N2 adsorption/desorption measurements, and the thermal stability of the catalyst at the operating temperature evaluated by thermogravimetric analysis. The N-rGO supports inhibited the catalyst aggregation; they enhanced the dispersibility of Mn-Ce oxide nanoparticles owing to the rich anchoring sites on their surface, leading to a high NOx conversion efficiency of >90% at 200 degrees C.
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