Influence of water on the reactivity of vanadia/titania for catalytic reduction of NOx
Influence of water on the reactivity of vanadia/titania for catalytic reduction of NOx
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DOI：
10.1016/0021-9517(92)90358-o
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发表时间：
1992-04
影响因子：
7.3
通讯作者：
N. Topsoe;T. Slabiak;B. Clausen;T. Srnak;J. Dumesic
中科院分区：
文献类型：
--
作者：
N. Topsoe;T. Slabiak;B. Clausen;T. Srnak;J. Dumesic
近年来，全球对NO[sub x]排放引起的大气污染问题的日益关注引发了对NO[sub x]减排的广泛研究。目前用于从烟道气中去除NO[sub x]的最重要的方法是通过NH[sub 3]选择性催化还原（SCR）NO[sub x]。基于二氧化钛的氧化钒催化剂由于其SCR活性和抗SO[sub 2]中毒性而在当今最常使用。过去几年，文献中报道了许多关于该催化剂系统和类似催化剂系统的研究。许多这些研究的目的是了解这些催化剂在工业DeNO[sub x]反应条件下的表面性质和反应性。然而，大多数这些研究都是在没有水的情况下进行的，而水通常存在于烟道气中。因此，需要研究水对催化剂本身以及对催化剂活性和选择性的影响。因此，作者报告了催化活性和原位FTIR研究的结果，这些研究已经在原料气中有水和没有水的情况下在氧化钒/二氧化钛催化剂上进行，以及来自真空程序升温脱附研究的一些结果。
The increasing global concern in the recent years over air pollution problems caused by NO[sub x] emission has brought forth extensive research on NO[sub x] reduction. The most important current process used to remove NO[sub x] from flue gas is the selective catalytic reduction (SCR) of NO[sub x] by NH[sub 3]. Titania-based vanadia catalysts are most often used today, due to their SCR activity and resistance to SO[sub 2] poisoning. Numerous studies on this and similar catalyst systems have been reported in the literature in the last few years. Many of these studies have been aimed at understanding the surface properties and reactivity of these catalysts under industrial DeNO[sub x] reaction conditions. However, most of these studies have been carried out in the absence of water, which is usually present in flue gas. Thus, there is a need to study the effects of water on the catalyst itself and on the catalyst activity and selectivity. Accordingly, the authors report the results of catalytic activity and in situ FTIR studies, which have been carried out on a vanadia/titania catalyst with and without water in the feed gas, as well as some results from vacuum temperature-programmed desorption studies.