Development and process evaluation of improved Fischer-Tropsch slurry catalysts. Final report

Bukur, Dragomir B.; Mukesh, D.; Patel, Snehal A.; Zimmerman, William H.; Rosynek, Michael P.; Kellogg, L.J.

doi:10.2172/10185415

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…As shown in Figure 10, 1W catalysts (0.3 pbm K) have selectivities 50-200% higher than catalysts with nominal potassium loading (3.6-5.2 pbm K). Decreasing CH4 selectivity with increasing K loading is well documented in the literature [4,24,29].…”

Section: Selectivitymentioning

confidence: 57%

Iron Fischer-Tropsch Catalysts Prepared by Solvent-Deficient Precipitation (SDP): Effects of Washing, Promoter Addition Step, and Drying Temperature

et al. 2015

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Abstract:A novel, solvent-deficient precipitation (SDP) method for catalyst preparation in general and for preparation of iron FT catalysts in particular is reported. Eight catalysts using a 2 3 factorial design of experiments to identify the key preparation variables were prepared. The catalysts were characterized by electron microprobe, N2 adsorption, TEM, XRD, and ICP. Results show that the morphology of the catalysts, i.e., surface area, pore volume, pore size distribution, crystallite sizes, and promoter distribution are significantly influenced by (1) whether or not the precursor catalyst is washed, (2) the promoter addition step, and (3) the drying condition (temperature). Consequently, the activity, selectivity, and stability of the catalysts determined from fixed-bed testing are also affected by these three variables. Unwashed catalysts prepared by a one-step method and dried at 100 °C produced the most active catalysts for FT synthesis. The catalysts of this study prepared by SDP compared favorably in activity, productivity, and stability with Fe FT catalysts reported in the literature. It is believed that this facile SDP approach has promise for development of future FT catalysts, and also offers a potential alternate route for the preparation of other catalysts for various other applications.

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Section: Selectivitymentioning

confidence: 57%

Iron Fischer-Tropsch Catalysts Prepared by Solvent-Deficient Precipitation (SDP): Effects of Washing, Promoter Addition Step, and Drying Temperature

et al. 2015

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“…Both of these methods have been described in our previous DOE reports (e.g. Bukur et al, 1989b). Results from all wax (slurry) withdrawals are summarized in Table 3, whereas other major events during the run are listed in Table 4.…”

Section: Do I Imentioning

confidence: 99%

Development of improved iron Fischer-Tropsch catalysts. Quarterly technical progress report, 1 January 1990--31 March 1990

Bukur¹,

Patel²,

Dalai³

et al. 1990

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This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States nor any agency thereof, nor any of their employees, makes 4' any warranty, expressed or implied, or assumes any legal liability or responsibility for any third party's results of such use of any information, apparatus, product or process disclosed in this report, or represents that its use by such a third party would not infringe privately owned fights.

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“…The preparation of precipitated Fe FT catalysts has been investigated previously by several academic research groups. − Studies performed at Texas A&M University by Bukur et al span more than 10 years and resulted in the development of active, selective, and stable catalysts prepared by a continuous co-precipitation method to carefully control pH and temperature, − which are among the most active iron catalysts reported in the literature. Studies showed that the addition of potassium (K) as a promoter to iron increases selectivity to olefins and heavy hydrocarbons, increases water–gas shift (WGS) activity, and can increase or decrease FTS activity, depending upon the amount of K used.…”

Section: Introductionmentioning

confidence: 99%

Preparation of an Unsupported Iron Fischer–Tropsch Catalyst by a Simple, Novel, Solvent-Deficient Precipitation (SDP) Method

et al. 2015

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Recent breakthroughs in the preparation of transition metal oxide nanoparticles by solvent-deficient precipitation (SDP) provide exciting new possibilities for simpler and faster methods to prepare heterogeneous catalysts with small uniformly sized crystallites of the active phase. In this study, the authors apply the SDP method to prepare an unsupported iron Fischer− Tropsch (FT) catalyst with a nominal composition of 100 Fe/5 Cu/4 K/16 SiO 2 (relative mass) and an average crystallite size of 10−11 nm. Three preparations of this catalyst were made using SDP, and each was tested for over 200 h in a fixed-bed reactor to determine activity, selectivity, and stability. Values of the apparent first-order rate constants for syngas consumption at 260 °C were 215−251 mmol g Fe −1 h −1 MPa −1 for our catalyst compared to 155−265 mmol g Fe −1 h −1 MPa −1 for literature catalysts not using a proprietary pretreatment (Bukur, D. B.; Lang, X. Ind. Eng. Chem. Res. 1999, 38, 3270−3275). Our catalyst was tested for more than 500 h and showed little or no downward trend with time, suggesting that the SDP method produces FT catalysts with not only high activity, competitive with the best reported in the literature, but also promising stability.

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Development and process evaluation of improved Fischer-Tropsch slurry catalysts. Final report

Cited by 5 publications

References 24 publications

Iron Fischer-Tropsch Catalysts Prepared by Solvent-Deficient Precipitation (SDP): Effects of Washing, Promoter Addition Step, and Drying Temperature

Iron Fischer-Tropsch Catalysts Prepared by Solvent-Deficient Precipitation (SDP): Effects of Washing, Promoter Addition Step, and Drying Temperature

Development of improved iron Fischer-Tropsch catalysts. Quarterly technical progress report, 1 January 1990--31 March 1990

Preparation of an Unsupported Iron Fischer–Tropsch Catalyst by a Simple, Novel, Solvent-Deficient Precipitation (SDP) Method

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