Browsing UTSA Faculty and Staff Works by Author "Jacobs, Gary"
Now showing items 1-14 of 14
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Editorial: Cobalt and Iron Catalysis
Shafer, Wilson D.; Jacobs, Gary (12/27/2019)Cobalt and iron have long history of importance in the field of catalysis that continues to this day. Currently, both are prevalent metals in a multitude of catalytic processes: [...] -
Fischer-Tropsch Synthesis: Cd, In and Sn Effects on a 15%Co/Al2O3 Catalyst
Ma, Wenping; Jacobs, Gary; Shafer, Wilson D.; Ji, Yaying; Klettlinger, Jennifer L. S.; Khalid, Syed; Hopps, Shelley D.; Davis, Burtron H. (10/16/2019)The effects of 1% of Cd, In and Sn additives on the physicochemical properties and Fischer-Tropsch synthesis (FTS) performance of a 15% Co/Al2O3 catalyst were investigated. The fresh and spent catalysts were characterized ... -
Fischer-Tropsch Synthesis: The Characterization and Testing of Pt-Co/SiO2 Catalysts Prepared with Alternative Cobalt Precursors
Mehrbod, Mohammad; Martinelli, Michela; Watson, Caleb D.; Cronauer, Donald C.; Kropf, A. Jeremy; Jacobs, Gary (6/1/2021)Different low-cost cobalt precursors (acetate, chloride) and thermal treatments (air calcination/H2 reduction versus direct H2-activation) were investigated to alter the interaction between cobalt and silica. H2-activated ... -
Fischer–Tropsch Synthesis: Computational Sensitivity Modeling for Series of Cobalt Catalysts
Williams, Harrison; Gnanamani, Muthu K.; Jacobs, Gary; Shafer, Wilson D.; Coulliette, David (10/15/2019)Nearly a century ago, Fischer and Tropsch discovered a means of synthesizing organic compounds ranging from C1 to C70 by reacting carbon monoxide and hydrogen on a catalyst. Fischer–Tropsch synthesis (FTS) is now known as ... -
Fischer–Tropsch Synthesis: Effect of the Promoter’s Ionic Charge and Valence Level Energy on Activity
Ribeiro, Mirtha Z. Leguizamón León; Souza, Joice C.; Gnanamani, Muthu Kumaran; Martinelli, Michela; Upton, Gabriel F.; Jacobs, Gary; Ribeiro, Mauro C. (10/10/2021)In this contribution, we examine the effect of the promoter´s ionic charge and valence orbital energy on the catalytic activity of Fe-based catalysts, based on in situ synchrotron X-ray powder diffraction (SXRPD), ... -
Fischer–Tropsch: Product Selectivity–The Fingerprint of Synthetic Fuels
Shafer, Wilson D.; Gnanamani, Muthu Kumaran; Graham, Uschi M.; Yang, Jia; Masuku, Cornelius M.; Jacobs, Gary; Davis, Burtron H. (3/14/2019)The bulk of the products that were synthesized from Fischer–Tropsch synthesis (FTS) is a wide range (C1–C70) of hydrocarbons, primarily straight-chained paraffins. Additional hydrocarbon products, which can also be a ... -
Hydrocracking of Octacosane and Cobalt Fischer–Tropsch Wax over Nonsulfided NiMo and Pt-Based Catalysts
Ma, Wenping; Kang, Jungshik; Jacobs, Gary; Hopps, Shelley D.; Davis, Burtron H. (9/30/2021)The effect of activation environment (N2, H2 and H2S/H2) on the hydrocracking performance of a NiMo/Al catalyst was studied at 380 °C and 3.5 MPa using octacosane (C28). The catalyst physical structure and acidity were ... -
Influence of Cs Loading on Pt/m-ZrO2 Water–Gas Shift Catalysts
Rajabi, Zahra; Martinelli, Michela; Watson, Caleb D.; Cronauer, Donald C.; Kropf, A. Jeremy; Jacobs, Gary (4/29/2021)Certain alkali metals (Na, K) at targeted loadings have been shown in recent decades to significantly promote the LT-WGS reaction. This occurs at alkali doping levels where a redshift in the C-H band of formate occurs, ... -
Influence of Cs Promoter on Ethanol Steam-Reforming Selectivity of Pt/m-ZrO2 Catalysts at Low Temperature
Rajabi, Zahra; Jones, Li; Martinelli, Michela; Qian, Dali; Cronauer, Donald C.; Kropf, A. Jeremy; Watson, Caleb D.; Jacobs, Gary (9/14/2021)The decarboxylation pathway in ethanol steam reforming ultimately favors higher selectivity to hydrogen over the decarbonylation mechanism. The addition of an optimized amount of Cs to Pt/m-ZrO2 catalysts increases the ... -
Low Temperature Water-Gas Shift: Enhancing Stability through Optimizing Rb Loading on Pt/ZrO2
Watson, Caleb D.; Martinelli, Michela; Cronauer, Donald Charles; Kropf, A. Jeremy; Jacobs, Gary (2/5/2021)Recent studies have shown that appropriate levels of alkali promotion can significantly improve the rate of low-temperature water gas shift (LT-WGS) on a range of catalysts. At sufficient loadings, the alkali metal can ... -
Na Promotion of Pt/m-ZrO2 Catalysts for the Steam Reforming of Formaldehyde
Martinelli, Michela; Garcia, Elijah S.; Rajabi, Zahra; Watson, Caleb D.; Kropf, A. Jeremy; Cronauer, Donald C.; Jacobs, Gary (2022-10-22)The decomposition selectivity of formaldehyde during steam reforming was explored using unpromoted and sodium promoted Pt/m-ZrO2 catalysts, and the Na content was varied (0.5%Na, 1%Na, 1.8%Na, 2.5%Na, and 5%Na). In situ ... -
Promoting the Selectivity of Pt/m-ZrO2 Ethanol Steam Reforming Catalysts with K and Rb Dopants
Martinelli, Michela; Garcia, Richard; Watson, Caleb D.; Cronauer, Donald C.; Kropf, A. Jeremy; Jacobs, Gary (8/29/2021)The ethanol steam reforming reaction (ESR) was investigated on unpromoted and potassium- and rubidium-promoted monoclinic zirconia-supported platinum (Pt/m-ZrO2) catalysts. Evidence from in situ diffuse reflectance infrared ... -
Substitution of Co with Ni in Co/Al2O3 Catalysts for Fischer–Tropsch Synthesis
Martinelli, Michela; Karuturi, Sai Charan; Garcia, Richard; Watson, Caleb D.; Shafer, Wilson D.; Cronauer, Donald C.; Kropf, A. Jeremy; Marshall, Christopher L.; Jacobs, Gary (3/17/2020)The effect of cobalt substitution with nickel was investigated for the Fischer–Tropsch synthesis reaction. Catalysts having different Ni/Co ratios were prepared by aqueous incipient wetness co-impregnation, characterized, ... -
The Preparation and Characterization of Co–Ni Nanoparticles and the Testing of a Heterogenized Co–Ni/Alumina Catalyst for CO Hydrogenation
López-Tinoco, Julián; Mendoza-Cruz, Rubén; Bazán-Díaz, Lourdes; Karuturi, Sai Charan; Martinelli, Michela; Cronauer, Donald C.; Kropf, A. Jeremy; Marshall, Christopher L.; Jacobs, Gary (12/21/2019)Samples of well-controlled nanoparticles consisting of alloys of cobalt and nickel of different atomic ratios were synthesized using wet chemical methods with oleylamine as the solvent and the reducing agent. These materials ...