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首页> 外文期刊>Clean technologies and environmental policy >Experimental and theoretical analysis of selective hydrogenation of p-nitroanisole to p-anisidine over Pd/C: kinetics and catalyst deactivation
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Experimental and theoretical analysis of selective hydrogenation of p-nitroanisole to p-anisidine over Pd/C: kinetics and catalyst deactivation

机译：在Pd / C上对硝基茴香醚选择性氢化为对茴香胺的实验和理论分析：动力学和催化剂失活

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摘要

The selective reduction of nitro compounds to the corresponding amines in multi-functional moieties is attempted in a variety of industries using polluting processes including iron-acid and sulfide/polysulfide reduction processes. In the current work, selective hydrogenation of p-nitroanisole (PNA) to p-anisidine (PA) has been carried out using supported metal catalysts. 5% Pd/C was found to be highly effective in comparison with other metal catalysts used. Kinetic interpretation has been made by studying the important process parameters using 5% Pd/C as the catalyst. The experimental results show that conversion of PNA reaches 100% under the appropriate reaction conditions. The reaction was found to be 100% selective towards PA. It was possible to determine both the rate constant and adsorption equilibrium constant for the reaction. The activation energy of reaction and free energy of adsorption were found to be 10.25 and -2.4 kcal mol~(-1), respectively, indicating that the reaction is Langmuir-Hinshelwood kinetically controlled. The catalyst was found to be deactivated due to the blocking of channels by product precipitation, which was considered as independent deactivation. A deactivation model was developed and it was found to fit the data very well. A complete theoretical and experimental analysis is presented.
机译：在多种工业中，尝试使用污染方法，包括铁酸和硫化物/多硫化物的还原方法，将硝基化合物选择性还原为多功能部分中的相应胺。在当前的工作中，已经使用负载的金属催化剂将对硝基苯甲醚（PNA）选择性氢化为对茴香胺（PA）。与使用的其他金属催化剂相比，发现5％Pd / C非常有效。通过使用5％Pd / C作为催化剂研究重要的工艺参数来进行动力学解释。实验结果表明，在适当的反应条件下，PNA的转化率达到100％。发现该反应对PA具有100％的选择性。可以确定反应的速率常数和吸附平衡常数。反应的活化能和吸附的自由能分别为10.25和-2.4 kcal mol〜（-1），表明该反应是Langmuir-Hinshelwood动力学控制的。发现该催化剂由于产物沉淀阻塞通道而失活，这被认为是独立的失活。开发了一个停用模型，发现它非常适合数据。提出了完整的理论和实验分析。

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