Skip to main content

24 Result(s)

within Wilson D. Shafer Remove this filter

previous disabled Page of 2
and

  1. No Access

    Article

    Hexane Aromatization: Analysis of the K-Edges of S and K Provides New Insight into H2S Poisoning of Pt/KL

    The purpose of this investigation was to examine the effect of sulfur impurity on 1%Pt/KL-zeolite catalyst by co-feeding 500 ppbv hydrogen sulfide (H2S) during hexane aromatization under industrially relevant con...

    Wilson D. Shafer, Gary Jacobs, Uschi M. Graham… in Catalysis Letters (2018)

  2. No Access

    Article

    Fischer–Tropsch Synthesis: XANES Spectra of Potassium in Promoted Precipitated Iron Catalysts as a Function of Time On-stream

    XANES K-edge spectra of potassium promoter in precipitated Fe catalysts were acquired following activation by carburization in CO and as a function of time on-stream during the course of a Fischer–Tropsch synt...

    Gary Jacobs, Venkat Ramana Rao Pendyala, Michela Martinelli… in Catalysis Letters (2017)

  3. No Access

    Article

    Fischer–Tropsch Synthesis: XANES Investigation of Hydrogen Chloride Poisoned Iron and Cobalt-Based Catalysts at the K-Edges of Cl, Fe, and Co

    The effect of co-fed hydrogen chloride (HCl) in syngas on the performance of iron and cobalt-based Fischer–Tropsch (FT) catalysts was investigated in our earlier studies (Ma et al. in ACS Catal 5:3124–3136, 2015;...

    Venkat Ramana Rao Pendyala, Gary Jacobs, Wen** Ma, Dennis E. Sparks… in Catalysis Letters (2016)

  4. No Access

    Article

    Effect of H2S in Syngas on the Fischer–Tropsch Synthesis Performance of a 0.5%Pt–25%Co–Al2O3 Catalyst

    The effect of 1.0 ppm H2S in the syngas feed on initial activity and selectivity of a 0.5%Pt–25%Co/Al2O3 catalyst was studied by comparing the catalyst performance under H2S and sulfur free conditions. The reacti...

    Wen** Ma, Gary Jacobs, Wilson D. Shafer, Venkat Ramana Rao Pendyala… in Catalysis Letters (2016)

  5. No Access

    Article

    Mitigation of Methane Selectivity on Pt/KL-Zeolite Aromatization Catalysts by Ag Promotion

    Silver addition, in low amounts (0.0054 or 0.013 %), to a 1 %Pt/KL catalysts prepared by a sequential CVD procedure using acetylacetonates resulted in improved benzene selectivity at similar conversion levels...

    Clement Bertaux, Gary Jacobs, Wilson D. Shafer, Burtron H. Davis in Catalysis Letters (2016)

  6. No Access

    Article

    Dehydrocyclization of C6 Hydrocarbon With and Without Oxygen Containing Substituent Over Pt/(Na)-Al2O3 Catalyst

    The presence of hydroxyl or keto functional group affects both activity and selectivity for dehydrocyclization of C6 hydrocarbon over Pt/(Na)–Al2O3 catalyst. Under similar reaction conditions, n-hexane produces b...

    Muthu Kumaran Gnanamani, Wilson D. Shafer, Robert A. Keogh… in Catalysis Letters (2016)

  7. No Access

    Article

    Isotopic Apportioning of Hydrogen/Deuterium on the Surface of an Activated Iron Carbide Catalyst

    Fischer–Tropsch (FT) synthesis continues to receive widespread attention. Even after 90 years of investigation, the mechanistic route has yet to be fully defined. FT, as a polymerization process, uses CO and H2 a...

    Wilson D. Shafer, Venkat Ramana Rao Pendyala, Muthu Kumaran Gnanamani… in Catalysis Letters (2015)

  8. No Access

    Article

    14C-Labeled Alcohol Tracer Study: Comparison of Reactivity of Alcohols over Cobalt and Ruthenium Fischer–Tropsch Catalysts

    The reactivity of 14C-labeled ethanol (CH 3 14 CH2OH) and 1-propanol (CH3CH 2 14 CH2OH) added during Fischer...

    Muthu Kumaran Gnanamani, Wilson D. Shafer… in Topics in Catalysis (2015)

  9. No Access

    Article

    Fischer–Tropsch Synthesis: Effect of Reducing Agent for Aqueous-Phase Synthesis Over Ru Nanoparticle and Supported Ru Catalysts

    The effect of the reducing agent on the performance of a ruthenium nanoparticle catalyst was investigated during aqueous-phase Fischer–Tropsch synthesis using a 1 L stirred tank reactor in the batch mode of op...

    Venkat Ramana Rao Pendyala, Wilson D. Shafer, Gary Jacobs… in Catalysis Letters (2015)

  10. No Access

    Article

    Fischer–Tropsch Synthesis: Effect of Activation Gas After Varying Cu Promoter Loading Over K-Promoted Fe-Based Catalyst

    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 tan...

    Venkat Ramana Rao Pendyala, Gary Jacobs, Hussein H. Hamdeh… in Catalysis Letters (2014)

  11. No Access

    Article

    Fischer–Tropsch Synthesis: Effect of Halides and Potassium Addition on Activity and Selectivity of Cobalt

    The effect of halides and potassium addition on cobalt Fischer–Tropsch synthesis (FTS) was studied using 1L CSTR at 493 K, 1.99 MPa and H2/CO of 2.0. The potential catalyst poison was co-fed with syngas after rea...

    Muthu Kumaran Gnanamani, Venkat Ramana Rao Pendyala, Gary Jacobs… in Catalysis Letters (2014)

  12. No Access

    Article

    Fischer–Tropsch Synthesis: Branched Paraffin Distribution for Potassium Promoted Iron Catalysts

    Iron Fischer–Tropsch catalysts with varying amounts of K (0, 2, 4, 6, 10 wt%) were utilized. Except possibly for the 10 wt% catalyst, the amount of the iso-alkanes produced was essentially constant for carbon ...

    Mingsheng Luo, Wilson D. Shafer, Burtron H. Davis in Catalysis Letters (2014)

  13. No Access

    Article

    Fischer–Tropsch Synthesis: Effect of Reaction Temperature for Aqueous-Phase Synthesis Over a Platinum Promoted Co/Alumina Catalyst

    The effect of reaction temperature on the performance of a traditional Fischer–Tropsch cobalt catalyst (0.5 % Pt–25 % Co/Al2O3) was investigated during aqueous-phase Fischer–Tropsch synthesis (AFTS) using a 1 L s...

    Venkat Ramana Rao Pendyala, Wilson D. Shafer, Gary Jacobs… in Catalysis Letters (2014)

  14. No Access

    Article

    Low Temperature Water–Gas Shift Reaction Over Alkali Metal Promoted Cobalt Carbide Catalysts

    Low temperature water–gas shift (LT-WGS) was performed over various group I alkali metal (Li, Na, K, Rb, Cs) promoted cobalt carbide (Co2C) catalysts at temperatures ranging from 453 to 573 K and atmospheric pres...

    Muthu Kumaran Gnanamani, Gary Jacobs, Wilson D. Shafer… in Topics in Catalysis (2014)

  15. No Access

    Article

    Fischer–Tropsch Synthesis: Oxidation of a Fraction of Cobalt Crystallites in Research Catalysts at the Onset of FT at Partial Pressures Mimicking 50 % CO Conversion

    Freshly H2-reduced catalyst samples and FTS catalyst samples (i.e., freshly reduced and immediately exposed to the onset of FTS conditions corresponding to 50 % CO conversion) were prepared. Each sample was coate...

    Thani Jermwongratanachai, Gary Jacobs, Wilson D. Shafer, Wen** Ma… in Topics in Catalysis (2014)

  16. No Access

    Article

    Fischer–Tropsch Synthesis: Deuterium Kinetic Isotopic Effect for a 2.5 % Ru/NaY Catalyst

    The isotopic effect of D2 was investigated for a 2.5 % Ru/NaY catalyst for Fischer–Tropsch synthesis at industrially relevant conditions (493 K, 1.92 MPa, H2/CO = 2). An inverse kinetic isotopic effect was found ...

    Jia Yang, Wilson D. Shafer, Venkat Ramana Rao Pendyala, Gary Jacobs… in Topics in Catalysis (2014)

  17. No Access

    Article

    Fischer–Tropsch Synthesis: Using Deuterium as a Tool to Investigate Primary Product Distribution

    Accumulation of products is a known phenomenon associated with a continuously stirred tank reactor (CSTR). Secondary reactions of α-olefins due to prolonged bed/pore residence time can significantly change the...

    Jia Yang, Wilson D. Shafer, Venkat Ramana Rao Pendyala, Gary Jacobs… in Catalysis Letters (2014)

  18. No Access

    Article

    An Investigation of the Partitioning of Dissociated H2 and D2 on Activated Nickel Catalysts

    Heterogeneous nickel catalysts play an important role in numerous processes. In the past, a number of H/D isotopic labeling studies have probed catalytic mechanisms during specific associative and dissociative...

    Wilson D. Shafer, John P. Selegue, Gary Jacobs, Burtron H. Davis in Catalysis Letters (2013)

  19. No Access

    Article

    Fischer–Tropsch Synthesis: Effect of Potassium on Activity and Selectivity for Oxide and Carbide Fe Catalysts

    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 (H2/H2O and CO). A freshly activat...

    Muthu Kumaran Gnanamani, Hussein H. Hamdeh, Wilson D. Shafer… in Catalysis Letters (2013)

  20. No Access

    Article

    Aqueous-Phase Fischer–Tropsch Synthesis: Effect of Reaction Temperature on Ruthenium Nanoparticle Catalyst and Comparison with Supported Ru and Co Catalysts

    The effect of reaction temperature on the performance of a ruthenium nanoparticle catalyst was investigated during aqueous-phase Fischer–Tropsch synthesis using a 1 L stirred tank reactor in the batch mode of ...

    Venkat Ramana Rao Pendyala, Wilson D. Shafer, Burtron H. Davis in Catalysis Letters (2013)

previous disabled Page of 2