Abstract
Selective hydrogenation of unsaturated aldehydes is one of the most important reactions in organic chemical industry. Herein, a N-doped Pd catalyst supported on porous carbon (Pd/NC) was prepared and examined on selective hydrogenation of 2-ethyl-2-hexenal (EHEA) to 2-ethylhexanal (EHA). The N-doped Pd/NC catalyst shows a superior catalytic conversion (i.e., about 1.4 times higher than that on the counterpart Pd/C catalyst at 353 K) and a remarkable selectivity (98%) to hydrogenating C=C bond on EHEA to the saturated product (2-ethylhexanal). The catalyst characterization results suggest that N do** can promote the electron density on the surface of Pd, which enhances the adsorption and further activation of hydrogen molecules so that it significantly improves the hydrogenation rate of 2-ethyl-2-hexenal. It is also clarified that the by-product, 2-ethylhexanol is formed via the hydrogenation of C=C bond in 2-ethyl-2-hexenol rather than the C=O group in 2-ethylhexanal. These interesting findings provide a promising strategy for future catalyst design and a meaningful understanding of selective hydrogenation of unsaturated aldehydes on Pd catalyst.
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Acknowledgements
We are grateful for the financial support from the National Natural Science Foundation of China (21878227).
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National Natural Science Foundation of China, 21878227, Yujun Zhao.
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Sun, S., Pan, D., Huang, H. et al. Selective hydrogenation of unsaturated aldehydes over Pd catalyst supported on N-doped porous carbon. Res Chem Intermed 48, 3129–3142 (2022). https://doi.org/10.1007/s11164-022-04744-3
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DOI: https://doi.org/10.1007/s11164-022-04744-3