The preparation and characterization of co–ni nanoparticles and the testing of a heterogenized co–ni/alumina catalyst for co hydrogenation
Por:
Lopez-Tinoco, Julian, Mendoza-Cruz, Ruben, Bazan-Diaz, Lourdes, Karuturi, Sai Charan, Martinelli, Michela, Cronauer, Donald C., Kropf, A. Jeremy, Marshall, Christopher L., Jacobs, Gary
Publicada:
1 ene 2020
Resumen:
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 were characterized by a variety of techniques, including high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Small amounts of heterogenized catalysts were prepared using alumina as the support. However, the potential for use of Co–Ni catalysts in CO hydrogenation was explored using a larger amount of Co–Ni/alumina catalyst prepared from standard aqueous impregnation methods and tested in a continuously stirred tank reactor (CSTR) for Fischer–Tropsch synthesis (FTS). Results are compared to a reference catalyst containing only cobalt. The heterogenized catalysts were characterized using synchrotron methods, including temperature programmed reduction with extended X-ray absorption fine structure spectroscopy and X-ray absorption near edge spectroscopy (TPR-EXAFS/XANES). The characterization results support intimate contact between Co and Ni, strongly suggesting alloy formation. In FTS testing, drawbacks of Ni addition included decreased CO conversion on a per gram catalyst basis, although Ni did not significantly impact the turnover number of cobalt, and produced slightly higher light gas selectivity. Benefits of Ni addition included an inverted induction period relative to undoped Co/Al2O3, where CO conversion increased with time on-stream in the initial period, and the stabilization of cobalt nanoparticles at a lower weight % of Co. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Filiaciones:
Lopez-Tinoco, Julian:
Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán 58030, Mexico
Univ Texas San Antonio, Dept Phys & Astron, One UTSA Circle, San Antonio, TX 78249 USA
Univ Michoacana, Fac Ingn Quim, Morelia 58030, Michoacan, Mexico
Mendoza-Cruz, Ruben:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Bazan-Diaz, Lourdes:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Ciudad de México, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Karuturi, Sai Charan:
Department of Mechanical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Univ Texas San Antonio, Dept Mech Engn, One UTSA Circle, San Antonio, TX 78249 USA
Martinelli, Michela:
Center for Applied Energy Research, University of Kentucky, 2540 Research Park Drive, Lexington, KY 40511, United States
Univ Kentucky, Ctr Appl Energy Res, 2540 Res Pk Dr, Lexington, KY 40511 USA
Cronauer, Donald C.:
Argonne National Laboratory, Argonne, IL 60439, United States
Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA
Kropf, A. Jeremy:
Argonne National Laboratory, Argonne, IL 60439, United States
Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA
Marshall, Christopher L.:
Argonne National Laboratory, Argonne, IL 60439, United States
Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA
Jacobs, Gary:
Department of Mechanical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Department of Biomedical Engineering and Chemical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States
Univ Texas San Antonio, Dept Mech Engn, One UTSA Circle, San Antonio, TX 78249 USA
Univ Texas San Antonio, Dept Biomed Engn & Chem Engn, One UTSA Circle, San Antonio, TX 78249 USA
|