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Product selectivity controlled by manganese oxide crystals in catalytic ammoxidation
Chinese Journal of Catalysis ( IF 16.5 ) Pub Date : 2021-09-15 , DOI: 10.1016/s1872-2067(21)63803-2
Hai Wang 1 , Qingsong Luo 1 , Liang Wang 1, 2 , Yu Hui 3 , Yucai Qin 3 , Lijuan Song 3 , Feng-Shou Xiao 1, 4
Affiliation  

The performances of heterogeneous catalysts can be effectively tuned by changing the catalyst structures. Here we report a controllable nitrile synthesis from alcohol ammoxidation, where the nitrile hydration side reaction could be efficiently prevented by changing the manganese oxide catalysts. α-Mn2O3 based catalysts are highly selective for nitrile synthesis, but MnO2-based catalysts including α, β, γ, and δ phases favour the amide production from tandem ammoxidation and hydration steps. Multiple structural, kinetic, and spectroscopic investigations reveal that water decomposition is hindered on α-Mn2O3, thus to switch off the nitrile hydration. In addition, the selectivity-control feature of manganese oxide catalysts is mainly related to their crystalline nature rather than oxide morphology, although the morphological issue is usually regarded as a crucial factor in many reactions.



中文翻译:

催化氨氧化反应中由氧化锰晶体控制的产物选择性

通过改变催化剂结构可以有效地调节多相催化剂的性能。在这里,我们报告了一种由醇氨氧化反应合成的可控腈,通过改变氧化锰催化剂可以有效地防止腈水合副反应。α-Mn 2 O 3基催化剂对腈合成具有高度选择性,但包括 α、β、γ 和 δ 相的MnO 2基催化剂有利于从串联氨氧化和水合步骤中生产酰胺。多项结构、动力学和光谱研究表明,α-Mn 2 O 3上的水分解受到阻碍,从而关闭腈水合。此外,锰氧化物催化剂的选择性控制特性主要与其结晶性质有关,而不是与氧化物形态有关,尽管形态问题通常被认为是许多反应中的关键因素。

更新日期:2021-09-16
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