Effects of CO2 on the deactivation behaviors of Co/Al2O3 and Co/SiO2 in CO hydrogenation to hydrocarbons

2017 ◽  
Vol 7 (18) ◽  
pp. 4079-4091 ◽  
Author(s):  
Kyung Soo Park ◽  
K. Saravanan ◽  
Seon-Ju Park ◽  
Yun-Jo Lee ◽  
Ki-Won Jeon ◽  
...  
Keyword(s):  
Co Hydrogenation ◽  
Surface Oxidation ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

Different deactivation behaviors of the prototype Co/γ-Al2O3 (CoAl) and Co/SiO2 (CoSi) catalysts under an excess CO2 environment were investigated in terms of the surface oxidation and aggregation of cobalt crystallites for the Fischer–Tropsch Synthesis (FTS) reaction.

Fischer-Tropsch CO-Hydrogenation on SiO2-supported Osmium Complexes

2008 ◽  
Vol 63 (3) ◽  
pp. 289-292 ◽  
Author(s):  
Ntombovuyo Bungane ◽  
Cathrin Welker ◽  
Eric van Steen ◽  
Michael Claeys
Keyword(s):  
Carbon Monoxide ◽  
Co Hydrogenation ◽  
Bond Formation ◽  
Organometallic Complexes ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
High Olefin ◽  
Osmium Complexes ◽  
Very High

The conversion of carbon monoxide with hydrogen was studied on a standard Os on SiO2 catalyst at different reaction temperatures, in the range between 200 and 300 °C. Additionally, supported di- and triatomic organometallic Os complexes were tested for their activity in the Fischer-Tropsch synthesis at 220 °C. All compounds showed formation of hydrocarbons, indicating that the organoosmium complexes are indeed active for C─C bond formation. Osmium as Fischer-Tropsch catalyst, however, is approximately 100 times less active compared to ruthenium. Very high methane selectivities (> 90 C-%) were obtained as well as high olefin to paraffin ratios, in particular with the organometallic complexes tested.

scholarly journals Catalytic Activity of Thermolyzed [Co(NH3)6][Fe(CN)6] in CO Hydrogenation Reaction

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3782
Author(s):  
Alevtina N. Gosteva ◽  
Mayya V. Kulikova ◽  
Yulya P. Semushina ◽  
Mariya V. Chudakova ◽  
Nikita S. Tsvetov ◽  
...  
Keyword(s):  
Thermal Destruction ◽  
Co Hydrogenation ◽  
Hydrogenation Reaction ◽  
Tropsch Synthesis ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Catalyst Composition ◽  
Synthetic Liquid Hydrocarbons

Currently, the processes of obtaining synthetic liquid hydrocarbons and oxygenates are very relevant. Fischer-Tropsch synthesis (FTS) is the most important step in these processes. The products of thermal destruction in argon of the mixture [Co(NH3)6][Fe(CN)6] and Al(OH)3 were used as catalysts for CO hydrogenation. The resulting compositions were studied using powder X-ray diffraction, IR spectroscopy, elemental analysis, SEM micrographs. The specific surface area, pore and particle size distributions were determined. It was determined that the DCS-based catalysts were active in the high-temperature Fischer-Tropsch synthesis. The effect of aluminum in the catalyst composition on the distribution of reaction products was revealed.

scholarly journals Mechanism of Cobalt-Catalyzed CO Hydrogenation: 2. Fischer–Tropsch Synthesis

ACS Catalysis ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 8061-8071 ◽  
Author(s):  
Wei Chen ◽  
Ivo A. W. Filot ◽  
Robert Pestman ◽  
Emiel J. M. Hensen
Keyword(s):  
Co Hydrogenation ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals Examining the temporal behavior of the hydrocarbonaceous overlayer on an iron based Fischer–Tropsch catalyst

RSC Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 2608-2617 ◽  
Author(s):  
Robbie Warringham ◽  
Alisha L. Davidson ◽  
Paul B. Webb ◽  
Robert P. Tooze ◽  
Russel A. Ewings ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Co Hydrogenation ◽  
Inelastic Neutron Scattering ◽  
Ambient Pressure ◽  
Inelastic Neutron ◽  
Tropsch Synthesis ◽  
Temporal Behavior ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Iron Based

Inelastic neutron scattering is used to examine an un-promoted iron based Fischer–Tropsch synthesis catalyst exposed to ambient pressure CO hydrogenation at 623 K for defined periods of time-on-stream (3, 6, 12 and 24 h).

Direct Evidence of Surface Oxidation of Cobalt Nanoparticles in Alumina-Supported Catalysts for Fischer–Tropsch Synthesis

ACS Catalysis ◽  
2014 ◽  
Vol 4 (12) ◽  
pp. 4510-4515 ◽  
Author(s):  
Christine Lancelot ◽  
Vitaly V. Ordomsky ◽  
Odile Stéphan ◽  
Majid Sadeqzadeh ◽  
Héline Karaca ◽  
...  
Keyword(s):  
Direct Evidence ◽  
Supported Catalysts ◽  
Surface Oxidation ◽  
Cobalt Nanoparticles ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

Kinetic Modeling of Fischer-Tropsch Synthesis over Fe/Ce/Al2O3

2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Hossein Atashi ◽  
Farhad Fazlollahi ◽  
Majid Sarkari ◽  
Ali A. Mirzaei ◽  
Mohsen Allahyari Shahrasb
Keyword(s):  
Co Hydrogenation ◽  
Fixed Bed ◽  
Operating Conditions ◽  
Tropsch Synthesis ◽  
Rate Equations ◽  
Feed Ratio ◽  
Fischer Tropsch ◽  
Adsorption Enthalpy ◽  
Fischer Tropsch Synthesis ◽  
Hydrogenation Reactions

In this experimental study, a kinetic model has been developed for Fischer-Tropsch synthesis reactions by using Fe/Ce/Al2O3 as the catalyst (80% Fe/20% Ce/5wt%Al2O3) in a fixed-bed micro reactor assuming no internal or external diffusion. Operating conditions of the reactor are as follows: reactor total pressure 6-22 atm; Temperature 543-573 K; H2/CO feed ratio 1.5-2 and space velocity 4200 hr-1. Light alkenes were successfully produced due to high activity and selectivity of the catalyst. Considering the mechanism of the process and Langmuir-Hinshelwood- Hogan-Watson (LHHW) approach, four different mechanisms, namely carbide, enol, combined carbide-enol, and parallel carbide-enol were defined for CO consumption rate equations. The rate expressions for the CO hydrogenation reactions are based on elementary reaction corresponding to the carbid-enol mechanism. The obtained rate expressions for the CO hydrogenation reactions from nonlinear regression analysis and Levenberg-Marquardt method demonstrate that the formation of monomer species (HCOs) due to CO hydrogenation reaction has controlled the FTS reaction rate. The activation energy and adsorption enthalpy were calculated as 58.38 kJ/mol and -22.26 kJ/mol, respectively. Also, the effects of temperature and pressure variation on selectivity and production rate of light products are presented.

scholarly journals The application of inelastic neutron scattering to investigate CO hydrogenation over an iron Fischer–Tropsch synthesis catalyst

2014 ◽  
Vol 312 ◽  
pp. 221-231 ◽  
Author(s):  
Neil G. Hamilton ◽  
Robbie Warringham ◽  
Ian P. Silverwood ◽  
Josef Kapitán ◽  
Lutz Hecht ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Co Hydrogenation ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis

scholarly journals Use of Plasma-Synthesized Nano-Catalysts for CO Hydrogenation in Low-Temperature Fischer–Tropsch Synthesis: Effect of Catalyst Pre-Treatment

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 822 ◽  
Author(s):  
James Aluha ◽  
Stéphane Gutierrez ◽  
François Gitzhofer ◽  
Nicolas Abatzoglou
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Co Hydrogenation ◽  
Product Distribution ◽  
Tropsch Synthesis ◽  
Effect Of Temperature ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Pre Treatment

A study was done on the effect of temperature and catalyst pre-treatment on CO hydrogenation over plasma-synthesized catalysts during the Fischer–Tropsch synthesis (FTS). Nanometric Co/C, Fe/C, and 50%Co-50%Fe/C catalysts with BET specific surface area of ~80 m2 g–1 were tested at a 2 MPa pressure and a gas hourly space velocity (GHSV) of 2000 cm3 h−1 g−1 of a catalyst (at STP) in hydrogen-rich FTS feed gas (H2:CO = 2.2). After pre-treatment in both H2 and CO, transmission electron microscopy (TEM) showed that the used catalysts shifted from a mono-modal particle-size distribution (mean ~11 nm) to a multi-modal distribution with a substantial increase in the smaller nanoparticles (~5 nm), which was statistically significant. Further characterization was conducted by scanning electron microscopy (SEM with EDX elemental mapping), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The average CO conversion at 500 K was 18% (Co/C), 17% (Fe/C), and 16% (Co-Fe/C); 46%, 37%, and 57% at 520 K; and 85%, 86% and 71% at 540 K respectively. The selectivity of Co/C for C5+ was ~98% with 8% gasoline, 61%, diesel and 28% wax (fractions) at 500 K; 22% gasoline, 50% diesel, and 19% wax at 520 K; and 24% gasoline, 34% diesel, and 11% wax at 540 K, besides CO2 and CH4 as by-products. Fe-containing catalysts manifested similar trends, with a poor conformity to the Anderson–Schulz–Flory (ASF) product distribution.

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