Improving C11+ Hydrocarbon Product Selectivity by Hydrogen Distribution in Fischer-Tropsch Synthesis

The present study examines the effect of hydrogen distribution (HD) along a Co/SiO2 catalyst bed on Fischer-Tropsch (FT) synthesis. The synthesis is performed under two pressures of 1.0 and 9.0 atm and different H2/CO ratios. The results are compared to those of the usual co-feed, in which both CO and H2 are introduced to the bed inlet. By HD strategy, the methane selectivity is suppressed by as much as 25% and the C11+ selectivity is enhanced up to 26%. CO conversion and product selectivity exhibited a strong dependence on the operating pressure and H2/CO ratio, when hydrogen is distributed.

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Fischer–Tropsch synthesis: A review of the effect of CO conversion on methane selectivity

Applied Catalysis A General ◽

10.1016/j.apcata.2013.10.061 ◽

2014 ◽

Vol 470 ◽

pp. 250-260 ◽

Cited By ~ 141

Author(s):

Jia Yang ◽

Wenping Ma ◽

De Chen ◽

Anders Holmen ◽

Burtron H. Davis

Keyword(s):

Tropsch Synthesis ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Co Conversion ◽

Methane Selectivity

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Effect of the Calcination Temperature on the Catalyst Performance of ZrO2-Supported Cobalt for Fischer-Tropsch Synthesis

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.3788 ◽

2011 ◽

Vol 347-353 ◽

pp. 3788-3793 ◽

Cited By ~ 1

Author(s):

Ya Chun Liu ◽

Hai Tao Wu ◽

Li Tao Jia ◽

Zai Hui Fu ◽

Jian Gang Chen ◽

...

Keyword(s):

Calcination Temperature ◽

Conversion Rate ◽

Tropsch Synthesis ◽

Cobalt Catalysts ◽

Product Selectivity ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Co Conversion ◽

Supported Cobalt Catalysts ◽

Cobalt Species

The effect of the calcination temperature on the catalyst performance of ZrO2-supported cobalt for Fischer-Tropsch synthesis is investigated. Results show that the size of the cobalt species particles of the ZrO2-supported cobalt catalysts increases and their reducibility is enhanced with increasing calcination temperature. In addition, the extent of CO linear absorption and bridge absorption peak increases and then decreases with increasing calcination temperature. The results from the Fishcer-Tropsch synthesis show that the CO conversion rate increases and then decreases as the calcination temperature is increased. Catalyst selectivity for C1monotonically decreases, whereas that for C5+increases. The changes in the CO conversion rate demonstrate a regularity consistent with the trend of the CO absorption peak extent. Meanwhile, the growth and enhanced reducibility of the cobalt species particles contribute to the generation of heavy hydrocarbons and explain the differences in product selectivity. Therefore, the appropriate calcination temperature facilitates an increase in the CO conversion rate of the ZrO2-supported cobalt catalysts and results in a better Fischer-Tropsch synthesis product selectivity.

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The Influence of Texture on Co/SBA–15 Catalyst Performance for Fischer–Tropsch Synthesis

Catalysts ◽

10.3390/catal8120661 ◽

2018 ◽

Vol 8 (12) ◽

pp. 661 ◽

Cited By ~ 1

Author(s):

Jun Han ◽

Zijiang Xiong ◽

Zelin Zhang ◽

Hongjie Zhang ◽

Peng Zhou ◽

...

Keyword(s):

Catalytic Activity ◽

Pore Size ◽

Conversion Rate ◽

Tropsch Synthesis ◽

Experimental Results ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Ft Synthesis ◽

Pore Length ◽

Co Conversion

The influence of the Co/SBA–15 catalyst texture, such as pore size and pore length on Fischer–Tropsch (FT) Synthesis, was investigated in this paper. The morphology, structure, and microstructures of Co/SBA–15 catalysts were characterized by SEM, Brunauer–Emmett–Teller (BET), TPR, HRTEM, and XRD. The experimental results indicated that the increase of pore size could improve the activity of the Co/SBA–15 catalyst, and the further increase of pore size could not significantly promote the activity. Moreover, it was also found that the pore length of the Co/SBA–15 catalyst played a key role in the catalytic activity. CO2 and C4+ selectivity were 2.0% and 74% during the simulated syngas (64% H2: 32% CO: balanced N2) FT over the Co/SBA–15 catalysts, and CO conversion rate and CH4 selectivity were 10.8% and 15.7% after 100 h time on stream.

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Fischer–Tropsch synthesis: effect of Cu, Mn and Zn addition on activity and product selectivity of cobalt ferrite

RSC Advances ◽

10.1039/c6ra10150j ◽

2016 ◽

Vol 6 (67) ◽

pp. 62356-62367 ◽

Cited By ~ 7

Author(s):

Muthu Kumaran Gnanamani ◽

Hussein H. Hamdeh ◽

Gary Jacobs ◽

Dali Qian ◽

Fang Liu ◽

...

Keyword(s):

Cobalt Ferrite ◽

Tropsch Synthesis ◽

Product Selectivity ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Ft Synthesis ◽

Zn Addition ◽

Alcohol Formation

The effect of Cu, Mn and Zn addition on cobalt ferrite was investigated for FT synthesis. The FT activity remains more or less the same for all four catalysts at higher temperatures. Zn and Mn were found to promote alcohol formation.

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Preparation and High-Throughput Testing of TiO2-Supported Co Catalysts for Fischer‒Tropsch Synthesis

Catalysts ◽

10.3390/catal11030352 ◽

2021 ◽

Vol 11 (3) ◽

pp. 352

Author(s):

Christian Schulz ◽

Peter Kolb ◽

Dennis Krupp ◽

Lars Ritter ◽

Alfred Haas ◽

...

Keyword(s):

High Throughput ◽

Anatase Phase ◽

Rutile Phase ◽

Tropsch Synthesis ◽

Performance Tests ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Co Catalysts ◽

Impregnation Technique ◽

Co Conversion

A series of Co/TiO2 catalysts was tested in a parameters field study for Fischer‒Tropsch synthesis (FTS). All catalysts were prepared by the conventional impregnation technique to obtain an industrially relevant Co content of 10 wt % or 20 wt %, respectively. In summary, 10 different TiO2 of pure anatase phase, pure rutile phase, as well as mixed rutile and anatase phase were used as supports. Performance tests were conducted with a 32-fold high-throughput setup for accelerated catalyst benchmarking; thus, 48 experiments were completed within five weeks in a relevant operation parameters field (170 °C to 233.5 °C, H2/CO ratio 1 to 2.5, and 20 bar(g)). The most promising catalyst showed a CH4 selectivity of 5.3% at a relevant CO conversion of 60% and a C5+ productivity of 2.1 gC5+/(gCo h) at 207.5 °C. These TiO2-based materials were clearly differentiated with respect to the application as supports in Co-catalyzed FTS catalysis. The most prospective candidates are available for further FTS optimization at a commercial scale.

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Passivation of Co/Al2O3 Catalyst by Atomic Layer Deposition to Reduce Deactivation in the Fischer–Tropsch Synthesis

Catalysts ◽

10.3390/catal11060732 ◽

2021 ◽

Vol 11 (6) ◽

pp. 732

Author(s):

José Antonio Díaz-López ◽

Jordi Guilera ◽

Martí Biset-Peiró ◽

Dan Enache ◽

Gordon Kelly ◽

...

Keyword(s):

Atomic Layer Deposition ◽

Atomic Layer ◽

Tropsch Synthesis ◽

Catalyst Stability ◽

Fischer Tropsch ◽

Technical Feasibility ◽

Fischer Tropsch Synthesis ◽

Layer Deposition ◽

Co Conversion ◽

Al2o3 Catalyst

The present work explores the technical feasibility of passivating a Co/γ-Al2O3 catalyst by atomic layer deposition (ALD) to reduce deactivation rate during Fischer–Tropsch synthesis (FTS). Three samples of the reference catalyst were passivated using different numbers of ALD cycles (3, 6 and 10). Characterization results revealed that a shell of the passivating agent (Al2O3) grew around catalyst particles. This shell did not affect the properties of passivated samples below 10 cycles, in which catalyst reduction was hindered. Catalytic tests at 50% CO conversion evidenced that 3 and 6 ALD cycles increased catalyst stability without significantly affecting the catalytic performance, whereas 10 cycles caused blockage of the active phase that led to a strong decrease of catalytic activity. Catalyst deactivation modelling and tests at 60% CO conversion served to conclude that 3 to 6 ALD cycles reduced Co/γ-Al2O3 deactivation, so that the technical feasibility of this technique was proven in FTS.

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Effect of Cobalt Catalyst Confinement in Carbon Nanotubes Support on Fischer-Tropsch Synthesis Performance

Symmetry ◽

10.3390/sym10110572 ◽

2018 ◽

Vol 10 (11) ◽

pp. 572 ◽

Cited By ~ 13

Author(s):

Omid Akbarzadeh ◽

Noor Mohd Zabidi ◽

Yasmin Abdul Wahab ◽

Nor Hamizi ◽

Zaira Chowdhury ◽

...

Keyword(s):

Carbon Nanotubes ◽

Fixed Bed ◽

Tropsch Synthesis ◽

Fischer Tropsch ◽

Fischer Tropsch Synthesis ◽

Cobalt Oxide Nanoparticles ◽

Co Conversion ◽

Multi Walled Carbon Nanotubes ◽

Pre Treatment ◽

The Stability

Pre-treating the multi-walled carbon nanotubes (CNTs) support by refluxing in 35 vol% nitric acid followed by heating at the temperature of 600 to 900 °C resulted in the formation of defects on the CNTs. Increasing the temperature of the pre-treatment of the CNTs from 600 °C to 900 °C, enhanced the fraction of cobalt-oxide nanoparticles encapsulated in the channels of CNTs from 31% to 70%. The performance of Co/CNTs in Fischer-Tropsch synthesis (FTS) was evaluated in a fixed-bed micro-reactor at a temperature of 240 °C and a pressure of 2.0 MPa. The highest CO conversion obtained over Co/CNTs.A.900 was 59% and it dropped by ~3% after 130 h of time-on-stream. However, maximum CO conversion using Co/CNTs.A.600 catalysts was 28% and it decreased rapidly by about 54% after 130 h of time-on-stream. These findings show that the combined acid and thermal pre-treatment of CNTs support at 900 °C has improved the stability and activity of the Co/CNTs catalyst in FTS.

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