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首页> 外文期刊>Catalysis science & technology >Activity patterns of metal oxide catalysts in the synthesis of N-phenylpropionamide from propanoic acid and aniline
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Activity patterns of metal oxide catalysts in the synthesis of N-phenylpropionamide from propanoic acid and aniline

机译：丙酸和苯胺合成N-苯基丙二酰胺中金属氧化物催化剂的活性模式

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摘要

The reactivities of various commercial and lab-made oxide samples (e.g., gamma-Al2O3, CeO2, ZrO2 and TiO2) in the heterogeneous catalytic synthesis of N-phenylpropionamide (T, 383 K) from aniline and propanoic acid have been investigated. All the materials studied drive the direct synthesis of the amide to an extent depending on both the chemical and structural properties. A 0th-order kinetic dependence on the substrate concentrations suggests that the reaction proceeds via a Langmuir-Hinshelwood (L-H) pathway under kinetic control of the adsorption-desorption steps (the rate determining step, r.d.s.). The comparative analysis of the activity data on the basis of the relative surface specific kinetic constant discloses a superior surface reactivity of TiO2, CeO2 and ZrO2 over the gamma-Al2O3 system, and also highlights marked differences in the catalytic functionality of the titania samples. IR spectroscopic studies of the carboxylic acids and amine adsorption and interaction patterns show the formation of the bidentate, bridging, and unidentate carboxylate intermediates accounting for the different amidation functionalities of the studied materials.
机译：已经研究了各种商业和实验室制造的氧化物样品（例如γ-AL2O3，CEO2，ZRO2和TIO2）在N-苯基丙二酰胺（T，383 K）的异质催化合成中的反应性。所有研究的材料都取决于化学和结构特性，将酰胺的直接合成驱动到一定程度上。对底物浓度的0阶动力学依赖性表明，在吸附 - 吸附步骤的动力学控制下，反应通过Langmuir-Hinshelwood（L-H）途径进行（速率确定步骤，R.D.S。）。基于相对表面特异性动力学常数对活性数据的比较分析表明，TiO2，CEO2和ZRO2的表面反应性超过了伽马A-AL2O3系统，并且还突出了泰坦尼亚样品催化功能的明显差异。 IR光谱研究对羧酸和胺吸附和相互作用模式显示出了双齿，桥接和独立的羧酸羧酸盐中间体的形成，这些羧酸盐中间体考虑了研究材料的不同胺化功能。

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