Kinetics and mechanism of reduction and reoxidation of the alkali metal promoted vanadia-titania catalysts

被引：27
作者：
Sloczynski, J
机构：
[1] Inst. of Catalys. and Surf. Chem., Polish Academy of Sciences, Niezapominajek, 30-239 Krakow, ul.
来源：
APPLIED CATALYSIS A-GENERAL | 1996年 / 146卷 / 02期
关键词：
vanadia-titania catalysts; reduction; reoxidation; oxidative dehydrogenation of propane; alkali promoters;
D O I：
10.1016/S0926-860X(96)00172-X
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：
Kinetics of reduction of the V2O5/TiO2 catalysts has been investigated as a function of reductant pressure, temperature, V2O5 content and the alkali metal (K, Rb) additives. It has been found that reduction is limited by the adsorption of propane at the surface of the vanadium phase. Reoxidation occurs in two stages: a quick surface reaction and a slow process limited by the bulk diffusion through the growing layer of the oxidation product, in agreement with Zhuravlev's model. Addition of promoters hinders the reduction due to the blocking of propane adsorption centres at the surface of the vanadium phase. Implications of the obtained results for the catalytic oxidative dehydrogenation of propane are discussed.
引用
收藏
页码：401 / 423
页数：23
相关论文
共 53 条
[1]  
ADAMSKA B, 1978, B ACAD POL SCI-CHIM, V26, P159
[2]   STUDY OF METAL-OXIDE CATALYSTS IN THE OLEFIN OXIDATION FROM THEIR REDUCTION BEHAVIOR .1. REDUCTION OF VARIOUS METAL-OXIDES WITH PROPYLENE [J].
ASO, I ;
NAKAO, M ;
YAMAZOE, N ;
SEIYAMA, T .
JOURNAL OF CATALYSIS, 1979, 57 (02) :287-295
[3]   SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE OVER VANADIA GRAFTED ON TITANIA - INFLUENCE OF VANADIA LOADING ON STRUCTURAL AND CATALYTIC PROPERTIES OF CATALYSTS [J].
BAIKER, A ;
HANDY, B ;
NICKL, J ;
SCHRAMLMARTH, M ;
WOKAUN, A .
CATALYSIS LETTERS, 1992, 14 (01) :89-99
[4]   SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE WITH AMMONIA .1. MONOLAYER AND MULTILAYERS OF VANADIA SUPPORTED ON TITANIA [J].
BAIKER, A ;
DOLLENMEIER, P ;
GLINSKI, M ;
RELLER, A .
APPLIED CATALYSIS, 1987, 35 (02) :351-364
[5]   INFLUENCE OF GRAIN MORPHOLOGY OF V2O5 ON ITS REDUCIBILITY AND SELECTIVITY FOR METHANOL OXIDATION [J].
BAIKER, A ;
MONTI, D .
JOURNAL OF CATALYSIS, 1985, 91 (02) :361-365
[6]   STUDIES OF TOPOCHEMICAL HETEROGENEOUS CATALYSIS .3. CATALYSIS OF REDUCTION OF METAL-OXIDES BY HYDROGEN [J].
BATLEY, GE ;
EKSTROM, A ;
JOHNSON, DA .
JOURNAL OF CATALYSIS, 1974, 34 (03) :368-375
[7]  
BIERMANN JJP, 1980, J PHYS CHEM-US, V94, P8598
[8]   INFLUENCE OF PHOSPHORUS AND POTASSIUM ADDITIVES ON THE PROPERTIES OF VANADIA/TITANIA CATALYSTS [J].
Bond, G. C. ;
Tahir, S. F. .
CATALYSIS TODAY, 1991, 10 (03) :393-395
[9]   STRUCTURE AND REACTIVITY OF TITANIA-SUPPORTED OXIDES .2. CHARACTERIZATION OF VARIOUS VANADIUM-OXIDE ON TITANIA CATALYSTS BY X-RAY PHOTOELECTRON-SPECTROSCOPY [J].
BOND, GC ;
ZURITA, JP ;
FLAMERZ, S .
APPLIED CATALYSIS, 1986, 27 (02) :353-362
[10]   STRUCTURE AND REACTIVITY OF TITANIA-SUPPORTED OXIDES .1. VANADIUM-OXIDE ON TITANIA IN THE SUBMONOLAYER AND SUPER-MONOLAYER REGIONS [J].
BOND, GC ;
ZURITA, JP ;
FLAMERZ, S ;
GELLINGS, PJ ;
BOSCH, H ;
VANOMMEN, JG ;
KIP, BJ .
APPLIED CATALYSIS, 1986, 22 (02) :361-378
123456