US EPA

1746673 

Journal Article 

Alumina-supported iron oxide nanoparticles as Fischer-Tropsch catalysts: Effect of particle size of iron oxide 

Park, JoY; Lee, Y; Khanna, PK; Jun, K; Bae, JW; Kim, YHo 

2010 

Yes 

Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169 

323 

1-2 

84-90 

10.1016/j.molcata.2010.03.025 

WOS:000278175300014 

The Fischer-Tropsch synthesis of unpromoted and nano-sized iron oxide supported on delta-Al(2)O(3) was investigated using a fixed-bed reactor. The catalysts prepared from pre-synthesized iron oxide with varying particle size (2-12 nm) showed much higher catalytic activities than the one prepared by using conventional impregnation method. The best results for CO conversion were obtained when the catalyst had Fe particle size of 6.1 nm. With an increase in particle size, the reduction degree and C(5)+ selectivity was increased, whereas CH(4) selectivity and the uptake of adsorbed CO were decreased. Turnover frequency (TOF) at 300 degrees C was increased from 0.02 to 0.16 s(-1) when d(Fe(0)) was increased from 2.4 to 6.2 nm, and then it remains almost constant up to a particle size of 11.5 nm. Particle sizes of prepared iron oxide were analyzed by XRD and TEM, and the reduction behaviors of Fe/Al(2)O(3) catalysts were studied by H(2)-TPR. The effective iron size, metal dispersion and reduction degree of Fe/Al(2)O(3) catalysts were measured by CO chemisorption and O(2) titration. (C) 2010 Elsevier B.V. All rights reserved. 

Fe/Al(2)O(3) catalyst; Size-defined nanoparticle; Fischer-Tropsch synthesis