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Highly selective Pd/KX catalysts for low-pressure one-step synthesis of 2-ethylhexanal from n-butyraldehyde and hydrogen

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Abstract

2-ethylhexanal (2EH) was directly synthesized from n-butyraldehyde and hydrogen at 1 atm and 150°C using the catalysts prepared by supporting tetraamine palladium(II) chloride on the potassium ion-exchanged zeolite X (Pd/KXW) and on the potassium ion-added zeolite X (Pd/KXU). The latter catalyst contains a larger amount of potassium ion and exhibits higher activity and very high selectivity of 2EH (>93%) due to its greater basicity. The main reaction path possibly starts from self-condensation of n-butyraldehyde on the catalyst basic sites to form 2-ethyl-3-hydroxyhexanal followed by dehydration to 2-ethyl-2-hexenal which was then hydrogenated on the metallic Pd sites to 2EH.

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Authors and Affiliations

  1. Department of Chemistry, Tunghai University, Taiwan, ROC

    An-Nan Ko, Chih Hao Hu & Yie Torng Yeh

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  1. An-Nan Ko
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  2. Chih Hao Hu
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  3. Yie Torng Yeh
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Ko, AN., Hu, C.H. & Yeh, Y.T. Highly selective Pd/KX catalysts for low-pressure one-step synthesis of 2-ethylhexanal from n-butyraldehyde and hydrogen. Catalysis Letters 54, 207–210 (1998). https://doi.org/10.1023/A:1019029416946

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  • DOI: https://doi.org/10.1023/A:1019029416946

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