Temperature-programmed reduction of cobalt-containing catalysts of the Fischer-Tropsch synthesis based on ultrafine aluminum powders alloyed with rare-earth metals

2009 ◽  
Vol 58 (6) ◽  
pp. 1315-1317 ◽  
Author(s):  
A. S. Seleznev ◽  
L. A. Petrov ◽  
V. I. Kononenko ◽  
I. A. Chupova ◽  
A. V. Ryabina
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Tropsch Synthesis ◽  
Temperature Programmed Reduction ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Aluminum Powders ◽  
Ultrafine Aluminum ◽  
Temperature Programmed

Cobalt Catalysts Preparation and Characterization over Alumina Support for Fischer Tropsch Synthesis

2017 ◽  
Vol 2 (1) ◽  
pp. 51-61
Author(s):  
Nima Mohammadi Taher ◽  
Maedeh Mahmoudi ◽  
Seyyede Shahrzad Sajjadivand
Keyword(s):  
Surface Area ◽  
Cobalt Catalyst ◽  
Cobalt Content ◽  
Tropsch Synthesis ◽  
Cobalt Catalysts ◽  
Fischer Tropsch ◽  
Alumina Support ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Temperature Programmed

Abstract An investigation was done to develop and characterize the alumina supported cobalt catalyst for Fischer-Tropsch Synthesis to produce biodiesel from biomass with the aim to produce alumina-supported cobalt catalysts containing 7 to 19 wt.% cobalt content. By using incipient wetness impregnation of γ-Al2O3 supports with cobalt nitrate hexahydrate with ethanol and distilled water solutions; the 14 wt.% cobalt content in catalyst was achieved. Nitrogen adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray fluorescence (XRF), H2temperature programmed reduction (H2-TPR), temperature programmed desorption (TPD), temperature programmed oxidation (TPO) and carbon monoxide chemisorption were used for the characterization of the catalysts to attain an appropriate cobalt catalyst. In order to investigate the effect of the impregnation on the crystalline size, surface area and cobalt content, three different impregnation methods with various durations were investigated. In addition, increasing the impregnation duration increased the cobalt content and its dispersion. Based on results, positive effect of the alumina support and impregnation duration on the crystallite size, surface area, and pore diameter, reducibility of the catalyst and cobalt dispersion were investigated. Thus, cobalt catalyst for using in fixed bed reactor to produce biodiesel from biomass through Fischer-Tropsch Synthesis was prepared and characterized.

scholarly journals Cobalt Based Catalysts Supported on Two Kinds of Beta Zeolite for Application in Fischer-Tropsch Synthesis

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 497 ◽  
Author(s):  
Renata Sadek ◽  
Karolina A. Chalupka ◽  
Pawel Mierczynski ◽  
Jacek Rynkowski ◽  
Jacek Gurgul ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalytic Performance ◽  
Tropsch Synthesis ◽  
Zeolite Catalysts ◽  
Beta Zeolite ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Liquid Products ◽  
Temperature Programmed

Co-containing Beta zeolite catalysts prepared by a wet impregnation and two-step postsynthesis method were investigated. The activity of the catalysts was examined in Fischer-Tropsch synthesis (FTS), performed at 30 atm and 260 °C. The physicochemical properties of all systems were investigated by means of X-ray diffraction (XRD), in situ XRD, temperature programmed desorption of ammonia (NH3-TPD), X-ray Photoelectron Spectroscopy (XPS), temperature programmed reduction of hydrogen (TPR-H2), and transmission electron microscopy (TEM). Among the studied catalysts, the best results were obtained for the samples prepared by a two-step postsynthesis method, which achieved CO conversion of about 74%, and selectivity to liquid products of about 86%. The distribution of liquid products for Red-Me-Co20Beta was more diversified than for Red-Mi-Co20Beta. It was observed that significant influence of the zeolite dealumination of mesoporous zeolite on the catalytic performance in FTS. In contrast, for microporous catalysts, the dealumination did not play such a significant role and the relatively high activity is observed for both not dealuminated and dealuminated catalysts. The main liquid products of FTS on both mesoporous and microporous catalysts were C10-C14 isoalkanes and n-alkanes. The iso-/n-alkanes ratio for dealuminated zeolite catalysts was three times higher than that for not dealuminated ones, and was related to the presence of different kind of acidic sites in both zeolite catalysts.

PERFORMANCE OF Ce-INCORPORATED KIT-6 SUPPORTED COBALT CATALYSTS FOR FISCHER–TROPSCH SYNTHESIS

2011 ◽  
Vol 04 (04) ◽  
pp. 369-372 ◽  
Author(s):  
GUODONG TAN ◽  
JINLIN LI ◽  
KONGYONG LIEW
Keyword(s):  
Hydrothermal Process ◽  
Magic Angle Spinning ◽  
Tropsch Synthesis ◽  
Mesoporous Molecular Sieves ◽  
Magic Angle ◽  
Incipient Wetness Impregnation ◽  
Fischer Tropsch ◽  
Co Catalyst ◽  
Fischer Tropsch Synthesis ◽  
Temperature Programmed

A series of Ce -incorporated structure of cubic large mesoporous molecular sieves, KIT-6, with different Ce contents were synthesized by a direct hydrothermal process. A sample of Ce -loaded KIT-6 material was synthesised by incipent wetness impregnation. Similarly, catalysts with 15 wt.% Co loading on the above supports were also synthesized by incipient wetness impregnation. The supports and catalysts were characterized by X-ray diffraction, diffuse reflectance UV-vis, solid-state 29Si magic-angle spinning nuclear magnetic resonance, H2 -temperature programmed reduction, H2 -temperature programmed desorption and oxygen titration. The structure of the KIT-6 support was well retained after Ce incorporation. Small amounts of Ce in the Co catalyst were found to improve the activity and increase the selectivity to C5+ hydrocarbons for Fischer–Tropsch synthesis, while larger amounts of Ce had the reverse effect. Meanwhile, methane selectivity shows an opposite trend as compared with that of C5+ selectivity. Ce -loaded KIT-6 supported Co catalyst showed lower activity than KIT-6 supported Co catalyst.

scholarly journals Fischer–Tropsch Synthesis: Effect of the Promoter’s Ionic Charge and Valence Level Energy on Activity

Reactions ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 408-426
Author(s):  
Mirtha Z. Leguizamón León Ribeiro ◽  
Joice C. Souza ◽  
Muthu Kumaran Gnanamani ◽  
Michela Martinelli ◽  
Gabriel F. Upton ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Orbital Energy ◽  
Level Energy ◽  
Ionic Charge ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Temperature Programmed ◽  
Similar Ionic Radius

In this contribution, we examine the effect of the promoter´s ionic charge and valence orbital energy on the catalytic activity of Fe-based catalysts, based on in situ synchrotron X-ray powder diffraction (SXRPD), temperature-programmed-based techniques (TPR, TPD, CO-TP carburization), and Fischer–Tropsch synthesis catalytic testing studies. We compared the promoting effects of K (a known promoter for longer-chained products) with Ba, which has a similar ionic radius but has double the ionic charge. Despite being partially “buried” in a crystalline BaCO3 phase, the carburization of the Ba-promoted catalyst was more effective than that of K; this was primarily due to its higher (2+) ionic charge. With Ba2+, higher selectivity to methane and lighter products were obtained compared to the K-promoted catalysts; this is likely due to Ba´s lesser capability of suppressing H adsorption on the catalyst surface. An explanation is provided in terms of a more limited mixing between electron-filled Ba2+ 5p and partially filled Fe 3d orbitals, which are expected to be important for the chemical promotion, as they are further apart in energy compared to the K+ 3p and Fe 3d orbitals.

Role of rare-earth oxides and thoria as promoters in precipitated iron-based catalysts for Fischer-Tropsch synthesis

1991 ◽  
Vol 77 (1) ◽  
pp. 109-122 ◽  
Author(s):  
Ding-zhu Wang ◽  
Xiao-ping Cheng ◽  
Zhi-er Huang ◽  
Xiu-zhi Wang ◽  
Shao-yi Peng
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxides ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Iron Based ◽  
Iron Based Catalysts

Effect of Rare-Earth Promoters on Precipitated Iron-Based Catalysts for Fischer–Tropsch Synthesis

2020 ◽  
Vol 59 (33) ◽  
pp. 14598-14605
Author(s):  
Zhonghao Han ◽  
Weixin Qian ◽  
Haitao Zhang ◽  
Hongfang Ma ◽  
Qiwen Sun ◽  
...  
Keyword(s):  
Rare Earth ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Iron Based ◽  
Iron Based Catalysts
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