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Effect of pH on Activity of NiMo/Al2O3 Catalysts Prepared with Citric Acid in Simultaneous Hydrodesulfurization and Hydrodenitrogenation Reactions

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Abstract

NiMo/alumina catalysts were prepared by impregnation of metal precursors in the presence of citric acid (CA) at different pHs. Catalysts were characterized by nitrogen physisorption, X-ray diffraction, temperature programmed reduction of sulfided catalysts (TPR-S), temperature programmed sulfidation (TPS) and NO chemisorption of sulfided catalysts. Catalytic activity for dibenzothiophene (DBT) hydrodesulfurization (HDS) was studied in a trickle-bed reactor, with and without quinoline in the reaction feed. Results suggest that HDS of DBT occurs mainly by direct desulfurization route and CA addition at pH 3 was detrimental, resulting in a less active catalyst, which was confirmed by TOF calculations. Furthermore, TPR-S results show that the catalyst prepared at pH 3 presented less coordinatively unsaturated sites (CUS), being less active than the one synthesized at pH 1. Besides that, the catalyst prepared at pH 1 was less inhibited at higher quinoline concentrations.

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Acknowledgements

Financial support by PETROBRAS S.A. (Grant 00500071477119) is gratefully acknowledged. Flávia Braggio and Matheus Mello acknowledge ANP, FINEP, CNPq and PRH-13 for their financial support. The authors thank LABTECH (EQ/UFRJ) for XRD characterizations. The authors are grateful to CENPES (PETROBRAS) for NO chemisorption, textural characterizations, TPR-S and TPS.

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Authors and Affiliations

  1. Escola de Química, Centro de Tecnologia, Universidade Federal do Rio de Janeiro, Bloco E, Av. Horácio Macedo, 2030-Cidade Universitária/Ilha do Fundão, Rio de Janeiro, RJ, 21941-909, Brazil

    Flávia A. Braggio, Matheus D. Mello, Bruno C. Magalhães & Mônica A. P. Silva

  2. PETROBRAS S.A. (CENPES), Av. Horácio Macedo, 950, Ilha do Fundão, Rio de Janeiro, RJ, 21949-190, Brazil

    José L. Zotin

Authors
  1. Flávia A. Braggio
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  2. Matheus D. Mello
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  3. Bruno C. Magalhães
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  4. José L. Zotin
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  5. Mônica A. P. Silva
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Correspondence to Mônica A. P. Silva.

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Braggio, F.A., Mello, M.D., Magalhães, B.C. et al. Effect of pH on Activity of NiMo/Al2O3 Catalysts Prepared with Citric Acid in Simultaneous Hydrodesulfurization and Hydrodenitrogenation Reactions. Catal Lett 147, 1104–1113 (2017). https://doi.org/10.1007/s10562-016-1903-6

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  • DOI: https://doi.org/10.1007/s10562-016-1903-6

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