SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE OVER VANADIA GRAFTED ON TITANIA - INFLUENCE OF VANADIA LOADING ON STRUCTURAL AND CATALYTIC PROPERTIES OF CATALYSTS

被引:39
作者
BAIKER, A [1 ]
HANDY, B [1 ]
NICKL, J [1 ]
SCHRAMLMARTH, M [1 ]
WOKAUN, A [1 ]
机构
[1] UNIV BAYREUTH,W-8580 BAYREUTH,GERMANY
关键词
REDUCTION OF NITRIC OXIDE; AMMONIA; VANADIA TITANIA; VANADYL ALKOXIDES; SELECTIVE IMMOBILIZATION; STRUCTURE SENSITIVITY; STRUCTURE OF VANADIA; RAMAN SPECTROSCOPY;
D O I
10.1007/BF00764222
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The selective catalytic reduction (SCR) of NO by NH3 has been studied over vanadia/titania catalysts prepared by selective immobilization of vanadyl alkoxide species on two structurally different titania supports. The loading of vanadia was varied from 1.8 to 7.5-mu-mol V5+ per m2 surface area. Comparative kinetic measurements at 150-degrees-C show that the NO turnover frequencies increase by more than an order of magnitude when the vanadia loading is increased from 1.8 to almost-equal-to 3-mu-mol V5+/m2. In the region of lower SCR activity, i.e. at lower coverages (almost-equal-to 2-mu-mol V5+/m2), small clusters and ribbons of vanadia are detected in the Raman spectra, whereas at loadings where maximum NO turnovers are achieved (almost-equal-to 3-mu-mol V5+/m2) the prevalent vanadia species are well-developed two-dimensional vanadia layers bound to titania.
引用
收藏
页码:89 / 99
页数:11
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