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Gan, Tao; He, Qian; Zhang, Hao; Xiao, Huajian; Liu, Yifei; Zhang, Ying; He, Xiaohui; Ji, Hongbing
Chemical engineering journal (Lausanne, Switzerland : 1996), 06/2020, Volume: 389Journal Article
Display omitted •Successful synthesis of kilogram-scale Au1/CeO2 SACs with ball milling approach.•Au1/CeO2 SACs are highly active, selective, and extremely stable for PROX reaction.•The Au1/CeO2 SACs with different preparation scales show essentially identical catalyst structure and catalytic performance.•The results show wide applicability of ball milling method to fabricate a family of oxide-supported noble metal SACs. Although CeO2-supported Au single atoms (Au1/CeO2) have great potential in preferential oxidation of CO (PROX) reaction, the large-scale synthesis of such single-atom catalysts (SACs) is still greatly challenging. Herein, we develop a dry ball milling method for the mass production of Au1/CeO2 SACs in large quantities (>1 kg). The as-prepared Au1/CeO2 SACs were demonstrated as highly active, selective, and stable catalysts for PROX at 120 °C with 100% CO conversion. The TOFs of Au1/CeO2 SACs for H2 oxidation at 120 °C (<0.01 s−1) were about two orders of magnitude lower than that for CO oxidation. Moreover, the four Au1/CeO2 SACs with different preparation scales showed essentially identical catalyst structure as well as catalytic performance. This approach can also be extended to prepare a family of oxide-supported noble metal SACs, which may pave a facile path for the mass production of oxide-supported SACs to meet industrialization production requirements.
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