CoCe/N–C hybrids constructed via Ce–O–Co solid solution for the deoxygenation of sulfoxide

Abstract

A series of CeO₂-promoted Co–N–C hybrids were prepared by the strategy of solid solution construction, systematically characterized, and applied in the catalytic deoxygenation of sulfoxide with H₂ successfully. According to the research findings, the activity of the hybrids was closely correlated with the content of CeO₂, and the Ce–O–Co solid solution observed in the CoCe/N–C hybrids was conducive to the Co species dispersion. Among all the hybrids, the catalyst with the appropriate CeO₂ content (CoCe₃/N–C) presented satisfactory performance in the above reaction, and attained 99.67% yield of methyl phenyl sulfoxide. Recycling experiments showed that the hybrid exhibited excellent stability and resistance to sulfur poisoning compared with the commercial Pd/C catalyst. Obviously, this work provides a novel strategy for the construction of transition metal and nitrogen co-doped carbon (M–N–C) catalysts with high metal utilization and high stability, while also improving the resistance to sulfur poisoning of metal catalysts.