Fischer-Tropsch synthesis: Attempt to tune FTS and WGS by alkali promoting of iron catalysts

Venkat Ramana Rao Pendyala; Gary Jacobs; Janet C. Mohandas; Mingsheng Luo; Wenping Ma; Muthu Kumaran Gnanamani; Burtron H. Davis

doi:10.1016/j.apcata.2010.09.018

Fischer-Tropsch synthesis: Attempt to tune FTS and WGS by alkali promoting of iron catalysts

Venkat Ramana Rao Pendyala, Gary Jacobs, Janet C. Mohandas, Mingsheng Luo, Wenping Ma, Muthu Kumaran Gnanamani, Burtron H. Davis

Center for Applied Energy Research (CAER)

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

The effect of water on the performance of alkali-promoted, precipitated Fe catalysts was investigated during Fischer-Tropsch (FT) synthesis in a continuously stirred tank reactor. In these studies, the added water (5-25 mol%) replaced an equivalent amount of inert gas so that all other reaction conditions remained the same before, during and after water addition. The externally added water had a positive effect on the CO conversion for all the alkali-promoted, precipitated iron catalysts. The impact of the added water is to increase the rate of the water-gas shift (WGS) reaction with up to 10-15 mol% added water, and then leveling off for further increases in the amount of water added to the feed gas. Increasing the water amount in the feed gas caused the fraction of CO converted into hydrocarbons to decrease and both the WGS activity and the oxygenate selectivity to increase. Common for all the alkali promoted iron catalysts was a decrease in C₅₊ selectivity and an increase in the methane selectivity with increasing amounts of water up to 10-15 mol%; with further increases of water, the C₅₊ selectivity increases and methane selectivity decreases. Methane selectivity is directly correlated to the CO conversion and H₂/CO ratio inside the reactor.

Original language	English
Pages (from-to)	131-139
Number of pages	9
Journal	Applied Catalysis A: General
Volume	389
Issue number	1-2
DOIs	https://doi.org/10.1016/j.apcata.2010.09.018
State	Published - Dec 1 2010

Bibliographical note

Funding Information:
This work was supported by the Commonwealth of Kentucky and a grant from the Kentucky Governor's Office of Energy Policy (KY – GOEP) Energy Research and Development Program entitled “Towards understanding how alkali promoters alleviate CO 2 production and enhance chain growth probability over iron Fischer–Tropsch synthesis catalysts.”

Keywords

Alkali
Fischer-Tropsch synthesis
Iron catalysts
Lithium
Potassium
Rubidium
Water effect

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

Access to Document

10.1016/j.apcata.2010.09.018

Cite this

@article{a28a3944ad114903bfc5ef7c29312589,

title = "Fischer-Tropsch synthesis: Attempt to tune FTS and WGS by alkali promoting of iron catalysts",

abstract = "The effect of water on the performance of alkali-promoted, precipitated Fe catalysts was investigated during Fischer-Tropsch (FT) synthesis in a continuously stirred tank reactor. In these studies, the added water (5-25 mol%) replaced an equivalent amount of inert gas so that all other reaction conditions remained the same before, during and after water addition. The externally added water had a positive effect on the CO conversion for all the alkali-promoted, precipitated iron catalysts. The impact of the added water is to increase the rate of the water-gas shift (WGS) reaction with up to 10-15 mol% added water, and then leveling off for further increases in the amount of water added to the feed gas. Increasing the water amount in the feed gas caused the fraction of CO converted into hydrocarbons to decrease and both the WGS activity and the oxygenate selectivity to increase. Common for all the alkali promoted iron catalysts was a decrease in C5+ selectivity and an increase in the methane selectivity with increasing amounts of water up to 10-15 mol%; with further increases of water, the C5+ selectivity increases and methane selectivity decreases. Methane selectivity is directly correlated to the CO conversion and H2/CO ratio inside the reactor.",

keywords = "Alkali, Fischer-Tropsch synthesis, Iron catalysts, Lithium, Potassium, Rubidium, Water effect",

author = "{Rao Pendyala}, {Venkat Ramana} and Gary Jacobs and Mohandas, {Janet C.} and Mingsheng Luo and Wenping Ma and Gnanamani, {Muthu Kumaran} and Davis, {Burtron H.}",

note = "Funding Information: This work was supported by the Commonwealth of Kentucky and a grant from the Kentucky Governor's Office of Energy Policy (KY – GOEP) Energy Research and Development Program entitled “Towards understanding how alkali promoters alleviate CO 2 production and enhance chain growth probability over iron Fischer–Tropsch synthesis catalysts.” ",

year = "2010",

month = dec,

day = "1",

doi = "10.1016/j.apcata.2010.09.018",

language = "English",

volume = "389",

pages = "131--139",

number = "1-2",

}

TY - JOUR

T1 - Fischer-Tropsch synthesis

T2 - Attempt to tune FTS and WGS by alkali promoting of iron catalysts

AU - Rao Pendyala, Venkat Ramana

AU - Jacobs, Gary

AU - Mohandas, Janet C.

AU - Luo, Mingsheng

AU - Ma, Wenping

AU - Gnanamani, Muthu Kumaran

AU - Davis, Burtron H.

N1 - Funding Information: This work was supported by the Commonwealth of Kentucky and a grant from the Kentucky Governor's Office of Energy Policy (KY – GOEP) Energy Research and Development Program entitled “Towards understanding how alkali promoters alleviate CO 2 production and enhance chain growth probability over iron Fischer–Tropsch synthesis catalysts.”

PY - 2010/12/1

Y1 - 2010/12/1

N2 - The effect of water on the performance of alkali-promoted, precipitated Fe catalysts was investigated during Fischer-Tropsch (FT) synthesis in a continuously stirred tank reactor. In these studies, the added water (5-25 mol%) replaced an equivalent amount of inert gas so that all other reaction conditions remained the same before, during and after water addition. The externally added water had a positive effect on the CO conversion for all the alkali-promoted, precipitated iron catalysts. The impact of the added water is to increase the rate of the water-gas shift (WGS) reaction with up to 10-15 mol% added water, and then leveling off for further increases in the amount of water added to the feed gas. Increasing the water amount in the feed gas caused the fraction of CO converted into hydrocarbons to decrease and both the WGS activity and the oxygenate selectivity to increase. Common for all the alkali promoted iron catalysts was a decrease in C5+ selectivity and an increase in the methane selectivity with increasing amounts of water up to 10-15 mol%; with further increases of water, the C5+ selectivity increases and methane selectivity decreases. Methane selectivity is directly correlated to the CO conversion and H2/CO ratio inside the reactor.

AB - The effect of water on the performance of alkali-promoted, precipitated Fe catalysts was investigated during Fischer-Tropsch (FT) synthesis in a continuously stirred tank reactor. In these studies, the added water (5-25 mol%) replaced an equivalent amount of inert gas so that all other reaction conditions remained the same before, during and after water addition. The externally added water had a positive effect on the CO conversion for all the alkali-promoted, precipitated iron catalysts. The impact of the added water is to increase the rate of the water-gas shift (WGS) reaction with up to 10-15 mol% added water, and then leveling off for further increases in the amount of water added to the feed gas. Increasing the water amount in the feed gas caused the fraction of CO converted into hydrocarbons to decrease and both the WGS activity and the oxygenate selectivity to increase. Common for all the alkali promoted iron catalysts was a decrease in C5+ selectivity and an increase in the methane selectivity with increasing amounts of water up to 10-15 mol%; with further increases of water, the C5+ selectivity increases and methane selectivity decreases. Methane selectivity is directly correlated to the CO conversion and H2/CO ratio inside the reactor.

KW - Alkali

KW - Fischer-Tropsch synthesis

KW - Iron catalysts

KW - Lithium

KW - Potassium

KW - Rubidium

KW - Water effect

UR - http://www.scopus.com/inward/record.url?scp=78649316552&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78649316552&partnerID=8YFLogxK

U2 - 10.1016/j.apcata.2010.09.018

DO - 10.1016/j.apcata.2010.09.018

M3 - Article

AN - SCOPUS:78649316552

VL - 389

SP - 131

EP - 139

IS - 1-2

ER -

Fischer-Tropsch synthesis: Attempt to tune FTS and WGS by alkali promoting of iron catalysts

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this