Browsing PHY Research Publications (from 2011) by Author "Shafer, Wilson D."
Now showing items 1-12 of 12
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Effect of H2S in syngas on the Fischer-Tropsch synthesis performance of a precipitated iron catalyst
Ma, Wenping; Jacobs, Gary; Sparks, Dennis E.; Shafer, Wilson D.; Hamdeh, Hussein H.; Hopps, Shelley D.; Pendyala, Venkat Ramana Rao; Hu, Yongfeng; Xiao, Qunfeng; Davis, Burtron H. (Elsevier B.V., 2016-03-05)The sulfur limit, the relationship between the sulfur added and the surface Fe atoms lost (Fe/S), and mechanism of sulfur poisoning were studied using an iron Fischer-Tropsch synthesis (FTS) catalyst (100 Fe/5.1 Si/2.0Cu/3.0K). ... -
Fischer-Tropsch synthesis: Activity and selectivity of chi-Fe5C2 and circle minus-Fe3C carbides
Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Jacobs, Gary; Shafer, Wilson D.; Sparks, Dennis E.; Keogh, Robert A.; Davis, Burtron H. (American Chemical Society, 2014-08-10)Two different iron carbides, Hägg (χ-Fe5C2) and cementite (ϴ-Fe3C) for Fischer-Tropsch synthesis (FTS) was investigated. Both iron carbides were oxidized to Fe3O4 during FTS. Hägg carbide (χ-Fe5C2), initially exhibits ... -
Fischer-Tropsch synthesis: Effect of activation gas after varying Cu promoter loading over K-promoted Fe-based catalyst
Pendyala, Venkat Ramana Rao; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Sparks, Dennis E.; Hopps, Shelley D.; Davis, Burtron H. (© Springer, 2014-09)The effects of activation gas and copper promoter loading on the Fischer-Tropsch synthesis performance of potassium promoted precipitated iron-based catalysts were investigated using a continuously stirred tank reactor. ... -
Fischer-Tropsch synthesis: Effect of CO conversion on CH4 and oxygenate selectivities over precipitated Fe-K catalysts
Ma, Wenping; Shafer, Wilson D.; Jacobs, Gary; Yang, Jia; Sparks, Dennis E.; Hamdeh, Hussein H.; Davis, Burtron H. (Elsevier, 2018-06-25)The explanation for CH4 selectivity for iron based Fischer-Tropsch catalysts in the low conversion region (Le., < 50%) remains elusive. In this contribution, the CO conversion effect was carefully examined over four K ... -
Fischer-Tropsch synthesis: Effect of Cu, Mn and Zn addition on activity and product selectivity of cobalt ferrite
Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Jacobs, Gary; Qian, Dali; Liu, Fang; Hopps, Shelley D.; Thomas, Gerald A.; Shafer, Wilson D.; Xiao, Qunfeng; Hu, Yongfeng; Davis, Burtron H. (Royal Society of Chemistry, 2016)The effect of Cu, Mn and Zn addition on cobalt ferrite was investigated for Fischer-Tropsch synthesis (FTS). Oxalate co-precipitation followed by decomposition under inert conditions was used to obtain various metal ... -
Fischer-Tropsch Synthesis: Effect of potassium on activity and selectivity for oxide and carbide Fe catalysts
Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Shafer, Wilson D.; Sparks, Dennis E.; Davis, Burtron H. (Springer US, 2013-11)The effect of potassium on oxides and carbides of iron for Fischer-Tropsch synthesis (FTS) was investigated by pretreating Fe3O4 and K-promoted Fe catalysts with different gases (H-2/H2O and CO). A freshly activated sample ... -
Fischer-Tropsch synthesis: Effects of hydrohalic acids in syngas on a precipitated iron catalyst
Ma, Wenping; Jacobs, Gary; Thomas, Gerald A.; Shafer, Wilson D.; Sparks, Dennis E.; Hamdeh, Hussein H.; Davis, Burtron H. (American Chemical Society, 2015-05)The current investigation was undertaken to identify limits of hydrohalic acid (HX, X = F, Cl, Br) impurities in syngas and shed light on the mechanism of FIX poisoning of a 100 Fe/5.1 Si/2 Cu/3 K FTS catalyst under ... -
Fischer–Tropsch synthesis: Mössbauer investigation of iron containing catalysts for hydrogenation of carbon dioxide
Gnanamani, Muthu Kumaran; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Davis, Burtron H. (Elsevier, 2012-05-25)CO2 hydrogenation was investigated with a doubly promoted (Cu, K) silica containing iron catalyst. Hägg carbide (χ-Fe5C2) is the dominant phase obtained under CO activation conditions at 543 K and 0.1 MPa and it was stable ... -
Hydrogenation of Carbon Dioxide over Co-Fe Bimetallic Catalysts
Gnanamani, Muthu Kumaran; Jacobs, Gary; Hamdeh, Hussein H.; Shafer, Wilson D.; Liu, Fang; Hopps, Shelley D.; Thomas, Gerald A.; Davis, Burtron H. (American Chemical Society, 2016-02)A series of Co-Fe bimetallic catalysts was prepared, characterized, and studied for the hydrogenation of carbon dioxide. The catalyst precursors were prepared via an oxalate coprecipitation method. Monometallic (Co or Fe) ... -
Hydrogenation of carbon dioxide over iron carbide prepared from alkali metal promoted iron oxalate
Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Shafer, Wilson D.; Hopps, Shelley D.; Davis, Burtron H. (Elsevier, 2018-08-25)Iron carbide was prepared by the carburization of iron oxalate doped with various alkali metals in flowing CO at 400 degrees C. The addition of alkali metal (Li, Na, K, Rb or Cs) to iron oxalate was found to decrease the ... -
Hydrogenation of carbon dioxide over K-Promoted FeCo bimetallic catalysts prepared from mixed metal oxalates
Gnanamani, Muthu Kumaran; Hamdeh, Hussein H.; Jacobs, Gary; Shafer, Wilson D.; Hopps, Shelley D.; Thomas, Gerald A.; Davis, Burtron H. (John Wiley & Sons, Inc., 2017-04-07)The hydrogenation of carbon dioxide over K-promoted FeCo bimetallic catalysts prepared by sequential oxalate decomposition and carburization of FeCo with CO was studied in a fixed-bed reactor at 240 degrees C and 1.2MPa. ... -
Increased CO2 hydrogenation to liquid products using promoted iron catalysts
Shafer, Wilson D.; Jacobs, Gary; Graham, Uschi M.; Hamdeh, Hussein H.; Davis, Burtron H. (Elsevier, 2019-01)The effect of alkali promoter (K, Rb and Cs) on the performance of precipitated iron-based catalysts was investigated for carbon dioxide (CO2) hydrogenation. Characterization by temperature-programmed reduction with CO, ...