2010
DOI: 10.1007/s10562-010-0452-7
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Fischer–Tropsch Synthesis: Effect of Water Over Iron-Based Catalysts

Abstract: The effect of water on the performance of potassium-promoted precipitated iron catalyst was investigated during Fischer-Tropsch synthesis (FTS) using a continuously stirred tank reactor (CSTR) at two different reaction temperatures. Water was added in such a manner as to replace an equivalent amount of inert gas so that all other reaction conditions (e.g., reactant partial pressure, space velocity) remained the same before, during, and after water addition. The externally added water had a positive effect on C… Show more

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Cited by 43 publications
(25 citation statements)
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“…Carbon monoxide selectivity drops below the detection limit at the lower temperature, but at a higher temperature there is only a minor increase in CO and methane. The loss in activity at low temperature is consistent with that reported by Pendyala et al [35] due to increased water oxidation of the iron catalyst during the Fischer Tropsch Synthesis (FTS) step.…”
Section: Resultssupporting
confidence: 91%
“…Carbon monoxide selectivity drops below the detection limit at the lower temperature, but at a higher temperature there is only a minor increase in CO and methane. The loss in activity at low temperature is consistent with that reported by Pendyala et al [35] due to increased water oxidation of the iron catalyst during the Fischer Tropsch Synthesis (FTS) step.…”
Section: Resultssupporting
confidence: 91%
“…The decrease in CO conversion (Fig. 2) for the unpromoted catalyst can [56] on the effect of water co-feeding to an iron-based FT catalyst (promoted with silica, potassium, and copper) showed that the effect of water was very sensitive to the reaction temperature. At high temperatures (270°C), the co-feeding of 10 % water at a CO conversion level of about 50 % resulted in increased WGS activity, leaving the FT activity virtually constant.…”
Section: Discussionmentioning
confidence: 99%
“…CAER researchers recently investigated [97] the water effect over a K-promoted iron catalyst under a low H 2 /CO syngas ratio (i.e., H 2 /CO = 0.7), typical of coal or biomass-derived syngas -and where internal WGS is important for boosting the H 2 /CO stoichiometry for carrying out FT. At 270 • C, the catalyst displayed a reversible positive increase in CO conversion and the carbide phase of the catalyst was retained. However, at 230 • C the catalyst deactivated sharply with 10% H 2 O addition, and iron oxide was generated.…”
Section: Iron Catalystsmentioning
confidence: 99%
“…By removing catalysts from the reactor with increasing time on stream or simulating a CO hydrogenation environment using CO, H 2 , and H 2 O, ex situ and in situ studies have provided information on changes in oxidation state and coordination environment occurring during aging [63,[82][83][84][85][86][87][88][89][90][91][92][93][94], during water co-feeding [95][96][97], during mildly oxidizing conditions using H 2 O/He addition [98], as a function of conversion (i.e., water partial pressure, since water is a product of FT) [63,70], and as a function of H 2 /CO ratio [72]. The recent coupling of synchrotron Raman spectroscopy with XRD and XAS to investigate both the activation and reaction testing of Fe catalysts is also discussed [94].…”
Section: Introductionmentioning
confidence: 99%