scholarly journals Linear α-olefin production with Na-promoted Fe–Zn catalysts via Fischer–Tropsch synthesis

RSC Advances ◽  
2019 ◽  
Vol 9 (25) ◽  
pp. 14176-14187 ◽  
Author(s):  
Sunkyu Yang ◽  
Sungwoo Lee ◽  
Seok Chang Kang ◽  
Seung Ju Han ◽  
Ki-Won Jun ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Intimate Contact ◽  
Fischer Tropsch Synthesis ◽  
Olefin Production ◽  
Linear Olefin ◽  
Olefin Selectivity

Intimate contact between Fe5C2 and Na2O leads to high linear olefin selectivity with minimizing branched paraffin formation.

scholarly journals Fischer–Tropsch Synthesis for Light Olefins from Syngas: A Review of Catalyst Development

Reactions ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 227-257
Author(s):  
Arash Yahyazadeh ◽  
Ajay K. Dalai ◽  
Wenping Ma ◽  
Lifeng Zhang
Keyword(s):  
Pore Size ◽  
Crystal Size ◽  
Tropsch Synthesis ◽  
Light Olefins ◽  
Face Centered Cubic ◽  
Fischer Tropsch ◽  
Light Olefin ◽  
Structure Transition ◽  
Fischer Tropsch Synthesis ◽  
Olefin Selectivity

Light olefins as one the most important building blocks in chemical industry can be produced via Fischer–Tropsch synthesis (FTS) from syngas. FT synthesis conducted at high temperature would lead to light paraffins, carbon dioxide, methane, and C5+ longer chain hydrocarbons. The present work focuses on providing a critical review on the light olefin production using Fischer–Tropsch synthesis. The effects of metals, promoters and supports as the most influential parameters on the catalytic performance of catalysts are discussed meticulously. Fe and Co as the main active metals in FT catalysts are investigated in terms of pore size, crystal size, and crystal phase for obtaining desirable light olefin selectivity. Larger pore size of Fe-based catalysts is suggested to increase olefin selectivity via suppressing 1-olefin readsorption and secondary reactions. Iron carbide as the most probable phase of Fe-based catalysts is proposed for light olefin generation via FTS. Smaller crystal size of Co active metal leads to higher olefin selectivity. Hexagonal close-packed (HCP) structure of Co has higher FTS activity than face-centered cubic (FCC) structure. Transition from Co to Co3C is mainly proposed for formation of light olefins over Co-based catalysts. Moreover, various catalysts’ deactivation routes are reviewed. Additionally, techno-economic assessment of FTS plants in terms of different costs including capital expenditure and minimum fuel selling price are presented based on the most recent literature. Finally, the potential for global environmental impacts associated with FTS plants including atmospheric and toxicological impacts is considered via lifecycle assessment (LCA).

scholarly journals Unravelling the K-promotion effect in a highly active and stable Fe5C2 nanoparticle for catalytic linear alpha-olefin production

2021 ◽  
Author(s):  
Jin Hee Lee ◽  
Hack-Keun Lee ◽  
Kwangsoo Kim ◽  
Geunbae Rhim ◽  
Min Hye Youn ◽  
...  
Keyword(s):  
Value Added ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Promotion Effect ◽  
Fischer Tropsch Synthesis ◽  
Highly Active ◽  
Olefin Production ◽  
Alpha Olefin ◽  
K Promotion ◽  
Alpha Olefins

C5−C13 linear alpha() olefins (LAOs) are high-value-added chemicals acknowledged by industry. However, using catalysts to elevate the activity and selectivity of LAOs remains a major challenge for Fischer–Tropsch synthesis (FTS)....

Enhanced olefin production in Fischer–Tropsch synthesis using ammonia containing synthesis gas feeds

2016 ◽  
Vol 275 ◽  
pp. 94-99 ◽  
Author(s):  
A.K. Rausch ◽  
L. Schubert ◽  
R. Henkel ◽  
E. van Steen ◽  
M. Claeys ◽  
...  
Keyword(s):  
Synthesis Gas ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Olefin Production

scholarly journals Substitution of Co with Ni in Co/Al2O3 Catalysts for Fischer–Tropsch Synthesis

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 334
Author(s):  
Michela Martinelli ◽  
Sai Charan Karuturi ◽  
Richard Garcia ◽  
Caleb D. Watson ◽  
Wilson D. Shafer ◽  
...  
Keyword(s):  
Tropsch Synthesis ◽  
Morphological Properties ◽  
Chemical Effect ◽  
Fischer Tropsch ◽  
Intimate Contact ◽  
Fischer Tropsch Synthesis ◽  
Weight Percentage ◽  
Cobalt Substitution ◽  
Nickel Addition ◽  
Continuously Stirred Tank Reactor

The effect of cobalt substitution with nickel was investigated for the Fischer–Tropsch synthesis reaction. Catalysts having different Ni/Co ratios were prepared by aqueous incipient wetness co-impregnation, characterized, and tested using a continuously stirred tank reactor (CSTR) for more than 200 h. The addition of nickel did not significantly modify the morphological properties measured. XRD, STEM, and TPR-XANES results showed intimate contact between nickel and cobalt, strongly suggesting the formation of a Co-Ni solid oxide solution in each case. Moreover, TPR-XANES indicated that nickel addition improves the cobalt reducibility. This may be due to H2 dissociation and spillover, but is more likely the results of a chemical effect of intimate contact between Co and Ni resulting in Co-Ni alloying after activation. FTS testing revealed a lower initial activity when nickel was added. However, CO conversion continuously increased with time on-stream until a steady-state value (34%–37% depending on Ni/Co ratio) was achieved, which was very close to the value observed for undoped Co/Al2O3. This trend suggests nickel can stabilize cobalt nanoparticles even at a lower weight percentage of Co. Currently, the cobalt price is 2.13 times the price of nickel. Thus, comparing the activity/price, the catalyst with a Ni/Co ratio of 25/75 has better performance than the unpromoted catalyst. Finally, nickel-promoted catalysts exhibited slightly higher initial selectivity for light hydrocarbons, but this difference typically diminished with time on-stream; once leveling off in conversion was achieved, the C5+ selectivities were similar (≈ 80%) for Ni/Co ratios up to 10/90, and only slightly lower (≈ 77%) at Ni/Co of 25/75.

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