NiMo/alumina hydrodesulphurization catalyst modified by saccharose: Effect of addition stage of organic modifier
| Autor: | José A. Colín, María C. Barrera, Ana W. Gutiérrez, José Escobar |
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| Rok vydání: | 2015 |
| Předmět: |
General Chemical Engineering
Batch reactor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Catalysis law.invention Solvent chemistry.chemical_compound chemistry Octahedron Physisorption Dibenzothiophene law Phase (matter) Organic chemistry Calcination 0210 nano-technology Nuclear chemistry |
| Zdroj: | The Canadian Journal of Chemical Engineering. 94:66-74 |
| ISSN: | 0008-4034 |
| DOI: | 10.1002/cjce.22334 |
| Popis: | NiMo/Al2O3 catalysts, obtained by one-pot simultaneous impregnation, were modified by saccharose (SA, at Ni/SA = 1 mol ratio) addition. To address the influence of stage of saccharide impregnation on the hydrodesulphurization activity of sulphided catalysts, three different preparation methodologies were followed: (a) modification of already calcined (400 °C) NiMo/Al2O3 by SA impregnation; (b) SA deposition directly onto the alumina support, prior to Ni + Mo impregnation; (c) simultaneous Ni + Mo + SA deposition. Materials were characterized by N2 physisorption, X-ray diffraction, infrared (IR) spectroscopy, UV-vis spectroscopy, and temperature-programmed reduction (TPR), and tested on liquid-phase dibenzothiophene (DBT) conversion (batch reactor, T = 320 °C, P = 7.2 MPa, n-hexadecane as solvent). The last methodology resulted in the catalyst with the highest DBT hydrodesulphurization (HDS) activity, on a pseudo-first order kinetic constant basis. A decreased proportion of tetrahedral Mo6+ species due to diminished interaction with the carrier, increased reducibility of octahedral Mo6+, and Ni complexation as well seemed to play determining roles in the trends of the activity observed. Simultaneous saccharose addition during NiMo phase impregnation required no additional preparation steps to efficiently integrate the organic modifier. |
| Databáze: | OpenAIRE |
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