MECHANISM OF THE SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE BY AMMONIA ELUCIDATED BY IN-SITU ONLINE FOURIER-TRANSFORM INFRARED-SPECTROSCOPY
MECHANISM OF THE SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE BY AMMONIA ELUCIDATED BY IN-SITU ONLINE FOURIER-TRANSFORM INFRARED-SPECTROSCOPY
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DOI：
10.1126/science.265.5176.1217
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发表时间：
1994-08-26
期刊：
影响因子：
56.9
通讯作者：
TOPSOE, NY
中科院分区：
文献类型：
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作者：
TOPSOE, NY
钒-钛催化剂上氨选择性催化还原NO反应是去除NOx污染的方法之一。在本研究中，它已经有可能确定的反应机理和这些催化剂中的活性位点的性质相结合的瞬态或稳态原位（傅立叶变换红外光谱）实验直接与在线活性研究。结果表明，催化循环，包括酸和氧化还原反应，并涉及两个表面V-OH（布朗斯台德酸网站）和V=O物种。提出了一个基本的微观动力学模型，它占所观察到的工业动力学性能。
The selective catalytic reduction reaction of nitric oxide by ammonia over vanadia-titania catalysts is one of the methods of removing NOx pollution. In the present study, it has been possible to identify the reaction mechanism and the nature of the active sites in these catalysts by combining transient or steady-state in situ (Fourier transform infrared spectroscopy) experiments directly with on-line activity studies. The results suggest a catalytic cycle that consists of both acid and redox reactions and involves both surface V-OH (Bronsted acid sites) and V=O species. A fundamental microkinetic model is proposed, which accounts for the observed industrial kinetics performance.