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Activation of two highly stable molecules- Nitrogen and Methane to co-produce Ammonia and Ethylene
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.cej.2020.127501
Sarojini Tiwari , Tuhin S. Khan , Pedram Tavadze , Jianli Hu

Two highly stable molecules, CH4 and N2 were simultaneously activated in a single-stage microwave-heated catalytic reactor to form ammonia, ethane, ethylene, and acetylene at atmospheric pressure. Density functional calculations and micro-kinetics modelling were used to predict the reaction behavior at temperatures ranging from 573 K to 973 K and validated with experimental analysis. The influences of terrace (111) and step (211) sites on K promoted Ru crystals were established in product formation and catalyst coking. NH3 formation occurs predominantly on the step (211) sites while C2 product formation can occur on both the sites. It was found that the elementary reaction steps leading to NH3 synthesis occurs due to the non-thermal effects of microwave irradiation while C2 products formed simultaneously are due to the thermal effects only. A reaction mechanism is postulated on the catalyst coking and validated experimentally by in-situ regeneration using H2 and O2.



中文翻译:

激活两个高度稳定的分子-氮和甲烷,共同生产氨和乙烯

在单级微波加热的催化反应器中,两个高度稳定的分子CH 4和N 2同时被活化,在大气压下形成氨,乙烷,乙烯和乙炔。密度泛函计算和微动力学模型被用来预测在573 K至973 K的温度下的反应行为,并通过实验分析进行了验证。在产物形成和催化剂焦化过程中,建立了台阶(111)和台阶(211)部位对钾促进的Ru晶体的影响。NH 3的形成主要发生在步骤(211)的位置上,而C 2产物的形成可以在两个位置上发生。发现导致NH 3的基本反应步骤由于微波辐射的非热效应而发生合成,而同时形成的C 2产物仅由于热效应而发生。推测了催化剂焦化的反应机理,并通过使用H 2和O 2进行原位再生进行了实验验证。

更新日期:2020-11-02
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