Lignin Fragmentation onto Multifunctional Fe3O4@Nb2O5@Co@Re Catalysts: The Role of the Composition and Deposition Route of Rhenium
| Autor: | Madalina Tudorache, Bahir Duraki, Bogdan Cojocaru, Frank Krumeich, Nicoleta G. Gheorghe, Jeroen A. van Bokhoven, Simona M. Coman, Cristina Opris, Vasile I. Parvulescu |
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| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Coprecipitation Precipitation (chemistry) Inorganic chemistry chemistry.chemical_element General Chemistry Ammonium perrhenate Rhenium 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Desorption Dispersion (chemistry) Cobalt Nuclear chemistry |
| Zdroj: | ACS Catalysis. 7:3257-3267 |
| ISSN: | 2155-5435 |
| DOI: | 10.1021/acscatal.6b02915 |
| Popis: | Multifunctional Fe3O4@Nb2O5@Co@Re catalysts with metal loadings in the range of 2–7 wt % were prepared via a multistep process. Magnetic nanoparticles prepared by coprecipitation were covered with a niobia shell precipitated from an ammonium niobate–oxalate complex in the presence of hexadecyltrimethylammonium bromide. The deposition of cobalt was performed using a deposition/precipitation procedure. Finally, rhenium has been deposited following three different routes: (i) impregnation, (ii) deposition and precipitation of rhenium chloride (ImC and PP, respectively), and (iii) impregnation with ammonium perrhenate (ImA). The characterization of these catalysts was achieved by X-ray diffraction, Raman, H2 and NH3 temperature-programmed desorption, X-ray photoelectron spectroscopy, and transmission electron microscopy showing the influence of the preparation procedure, reduction, and Re/Co cooperation on the degree of dispersion and reduction. ImC and ImA routes led to more reduced catalysts, and the decrea... |
| Databáze: | OpenAIRE |
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