Carboxylic acid-modified metal oxide catalyst for selectivity-tunable aerobic ammoxidation

Xiuquan Jia, Jiping Ma (), Fei Xia, Yongming Xu, Jin Gao and Jie Xu ()
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Xiuquan Jia: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Jiping Ma: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Fei Xia: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yongming Xu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Jin Gao: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Jie Xu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Controlling the reaction selectivity of a heterobifunctional molecule is a fundamental challenge in many catalytic processes. Recent efforts to design chemoselective catalysts have focused on modifying the surface of metal nanoparticle materials having tunable properties. However, precise control over the surface properties of base-metal oxide catalysts remains a challenge. Here, we show that green modification of the surface with carboxylates can be used to tune the ammoxidation selectivity toward the desired products during the reaction of hydroxyaldehyde on manganese oxide catalysts. These modifications improve the selectivity for hydroxynitrile from 0 to 92% under identical reaction conditions. The product distribution of dinitrile and hydroxynitrile can be continuously tuned by adjusting the amount of carboxylate modifier. This property was attributed to the selective decrease in the hydroxyl adsorption affinity of the manganese oxides by the adsorbed carboxylate groups. The selectivity enhancement is not affected by the tail structure of the carboxylic acid.

Date: 2018
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DOI: 10.1038/s41467-018-03358-x

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