351. Ultrafine PdCo bimetallic nanoclusters confined in N-doped porous carbon for the efficient semi-hydrogenation of alkynes.
- Author
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Zhan, Xuecheng, Zhu, Hanghang, Ma, Haowen, Hu, Xiaoli, Xie, Yuan, Guo, Dajiang, Chen, Minglin, Ma, Ping, Sun, Liming, Wang, Wei David, and Dong, Zhengping
- Subjects
ALKYNES ,DOPING agents (Chemistry) ,BIMETALLIC catalysts ,CATALYTIC hydrogenation ,CHEMICAL industry ,MESOPOROUS materials - Abstract
Semi-hydrogenation of alkynes to prepare alkenes is an important reaction in the petrochemical and fine chemical industries. The use of conventional Pd nanoparticle-based catalysts is limited by alkyne over-hydrogenation and low Pd utilization. In this study, a nitrogen-doped mesoporous carbon material (m-NC), which was rich in defect sites after Zn volatilization, was fabricated by the carbonization of ZIF-8. Ultrafine PdCo bimetallic nanoclusters with Co atom-modified Pd active site electronic and compositional structure were highly dispersed and confined in m-NC. As-obtained Pd
0.43 Co1 /m-NC was used for the semi-hydrogenation of alkynes and it exhibited high selectivity with high conversion under mild reaction conditions. Pd0.43 Co1 /m-NC also exhibited excellent stability in leaching tests and maintained its catalytic activity for at least nine reaction cycles. The highly dispersed active sites in Pd0.43 Co1 /m-NC served as the active sites for the catalytic semi-hydrogenation of alkynes; as a regulator, the second metal Co effectively improved selectivity, and m-NC endowed the catalyst with excellent stability. The research work presented here may provide a foundation for the design of highly active, selective, and stable Pd-based bimetallic catalysts for selective hydrogenation. [ABSTRACT FROM AUTHOR]- Published
- 2022
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