Heterogeneous catalysts are widely used in C–C coupling reactions due to their easy separation and recycling. Single-atom catalysts (SACs), as the most active new field in heterogeneous catalysis, has attracted considerable attention because of their low cost and ultrahigh atomic utilization. However, SACs are thermodynamically unstable, so the choice of support materials has a significant influence on their catalytic performance and stability. Metal organic framework (MOF)-derived carbon materials can be served as ideal supports to anchor atomically dispersed metal atoms for their high specific surface area, porous structure and abundant nitrogen atoms as dopants. In this work, a Pd single-atom catalyst supported on MOF-derived ZrO2-doping N-doped carbon is reported. The resulting Pd@ZrO2/N-C exhibited excellent catalytic activity as a heterogeneous catalyst for the Suzuki-Miyaura cross coupling reaction of aryl boronic acids and aryl halides. The yield of all tested substrates was over 90% at 80°C for 4h in ethanolic water. Meanwhile, Pd@ZrO2/N-C could be simply recycled and remained highly active after being reused several times. This work provides a new idea for the development of efficient and practical SACs for heterogeneous reactions.

Heterogeneous catalysts are widely used in C–C coupling reactions due to their easy separation and recycling. Single-atom catalysts (SACs), as the most active new field in heterogeneous catalysis, has attracted considerable attention because of their low cost and ultrahigh atomic utilization. However, SACs are thermodynamically unstable, so the choice of support materials has a significant influence on their catalytic performance and stability. Metal organic framework (MOF)-derived carbon materials can be served as ideal supports to anchor atomically dispersed metal atoms for their high specific surface area, porous structure and abundant nitrogen atoms as dopants. In this work, a Pd single-atom catalyst supported on MOF-derived ZrO2-doping N-doped carbon is reported. The resulting Pd@ZrO~2~/N-C exhibited excellent catalytic activity as a heterogeneous catalyst for the Suzuki-Miyaura cross coupling reaction of aryl boronic acids and aryl halides. The yield of all tested substrates was over 90% at 80°C for 4h in ethanolic water. Meanwhile, Pd@ZrO~2~/N-C could be simply recycled and remained highly active after being reused several times. This work provides a new idea for the development of efficient and practical SACs for heterogeneous reactions.

Palladium single-atom catalyst for Suzuki-Miyaura cross coupling reaction in eco-friendly media

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