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| CaO catalyzes NH3 oxidation, while sulfated CaO catalyzes NO reduction by NH3 in the presence of O2, and the adsorption and transformation of ammonia over CaO and sulfated CaO has been investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) to understand their catalytic mechanism. It has been found that ammonia is first adsorbed over Lewis or Brönsted acid sites, and later undergoes hydrogen abstraction giving rise to either NH2 amide or NH imide intermediates. The intermediates react with NO or lattice O to produce N2 or NO. Comparing the DRIFTS of NH3 adsorption over CaO and sulfated CaO, it is obvious that ammonia adsorbed over CaO is activated mainly in NH form apt to react with surface oxygen to produce NO, while ammonia adsorbed over sulfated CaO is activated mainly in NH2 form apt to reduce NO. The DRIFTS results agree with experimental data and explain the catalytic mechanisms of CaO and sulfated CaO. |
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轩辕剑: 金币+10, 翻译EPI+1 2015-12-20 21:13:03
轩辕剑: 金币+10, 翻译EPI+1 2015-12-20 21:13:03
| 氧化钙可催化氨的氧化，而硫化后的氧化钙能催化氨在氧气中还原一氧化氮，为了解其催化机理，通过原位的漫反射红外傅里叶光谱，研究了氨在氧化钙和硫化后的氧化钙上的吸附和转化。结果表明氨首先作为路易斯酸被吸附，然后经过脱氢生成NH2或NH中间体，该中间体与NO或O反应生成N2或NO。比较两种吸附NH3的DRIFT，结果显示氧化钙吸附的氨主要以NH的形式被活化后与氧化硫反应生成NO，而硫化后氧化钙的吸附氨主要NH2的形式被活化后产生NO。DRIFTS研究结果与实验的数据一致，并解释了氧化钙和硫化后氧化钙的催化机理。 外行 尽请指正 |
2楼2015-12-15 00:49:51