Effect of the activation atmosphere on the activity of Fe catalysts supported on SBA-15 in the Fischer-Tropsch Synthesis

被引：69

作者：

Cano, Leonardo A. ^{[1
]}

Cagnoli, Maria V. ^{[1
]}

Bengoa, Jose F. ^{[1
]}

Alvarez, Ana M. ^{[1
]}

Marchetti, Sergio G. ^{[1
]}

机构：

[1] UNLP, CINDECA, CONICET, CICPBA,Fac Ciencias Exactas,Fac Ingn, RA-1900 La Plata, Argentina

来源：

JOURNAL OF CATALYSIS | 2011年 / 278卷 / 02期

关键词：

Fischer-Tropsch Synthesis; Fe/SBA-15; Activation atmosphere; Mossbauer spectroscopy; IRON CATALYST; PARTICLE-SIZE; MOSSBAUER-SPECTRA; CARBURIZATION; NANOPARTICLES; SPECTROSCOPY; SELECTIVITY; CRYSTAL; SURFACE;

D O I：

10.1016/j.jcat.2010.12.017

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：

An iron catalyst supported on SBA-15 was prepared and activated in H-2 stream and in synthesis gas (H-2:CO = 2:1) stream, in order to be used in the Fischer-Tropsch Synthesis. The different activation treatments led to different Fe species in fresh catalysts: alpha-Fe, Fe3O4 and Fe2+ diffused into the SBA-15 walls in H2-Fe/SBA-15 and chi-Fe5C2, Fe3O4 and Fe2+ in H2:CO-Fe/SBA-15. These initial differences in the "bulk" structure of the solids disappear when both catalysts are "working". However, a higher production of total hydrocarbons, higher CO conversion and more CH4 and light gases were obtained for H2-Fe/SBA-15 over 6 days. Besides, a higher selectivity toward light olefins was obtained with H2-Fe/SBA-15 during the first 24 h on reaction stream, but this selectivity decreases with the reaction time. These results are explained considering that the iron carbides produced from alpha-Fe are more active and/or have smaller sizes than that obtained from alpha-Fe2O3. (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：310 / 320

页数：11

共 56 条

[1] CARBURIZATION OF SUPPORTED IRON SYNTHESIS CATALYSTS [J].

AMELSE, JA ;

BUTT, JB ;

SCHWARTZ, LH .

JOURNAL OF PHYSICAL CHEMISTRY, 1978, 82 (05) :558-563

[2]

Anderson RB., 1956, Catalysis, VIV., P29

[3]

Anderson RB., 1984, FISCHER TROPSCH SYNT

[4] A NEW FAMILY OF MESOPOROUS MOLECULAR-SIEVES PREPARED WITH LIQUID-CRYSTAL TEMPLATES [J].

BECK, JS ;

VARTULI, JC ;

ROTH, WJ ;

LEONOWICZ, ME ;

KRESGE, CT ;

SCHMITT, KD ;

CHU, CTW ;

OLSON, DH ;

SHEPPARD, EW ;

MCCULLEN, SB ;

HIGGINS, JB ;

SCHLENKER, JL .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (27) :10834-10843

[5] Iron oxide nanoparticles inside the MCM-41 channels: Study of the structural stability of the support [J].

Bengoa, JF ;

Cagnoli, MV ;

Gallegos, NG ;

Alvarez, AM ;

Mogni, LV ;

Moreno, MS ;

Marchetti, SG .

MICROPOROUS AND MESOPOROUS MATERIALS, 2005, 84 (1-3) :153-160

[6] 57Fe Mossbauer spectroscopic examination of a single crystal of Fe3O4 [J].

Berry, FJ ;

Skinner, S ;

Thomas, MF .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1998, 10 (01) :215-220

[7] Cobalt particle size effects in the Fischer-Tropsch reaction studied with carbon nanofiber supported catalysts [J].

Bezemer, GL ;

Bitter, JH ;

Kuipers, HPCE ;

Oosterbeek, H ;

Holewijn, JE ;

Xu, XD ;

Kapteijn, F ;

van Dillen, AJ ;

de Jong, KP .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (12) :3956-3964

[8] ON THE MECHANISM OF THE FISCHER-TROPSCH SYNTHESIS INVOLVING UNREDUCED IRON CATALYST [J].

BLANCHARD, F ;

REYMOND, JP ;

POMMIER, B ;

TEICHNER, SJ .

JOURNAL OF MOLECULAR CATALYSIS, 1982, 17 (2-3) :171-181

[9]

BLUME M, 1968, PHYS REV, V165, P446, DOI 10.1103/PhysRev.165.446

[10] Size dependence of the properties of hematite nanoparticles [J].

Bodker, F ;

Morup, S .

EUROPHYSICS LETTERS, 2000, 52 (02) :217-223

← 1 2 3 4 5 6 →