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Study of the impregnation of NiMo assisted by chelating agents for hydrodesulfurization-supported catalysts over mesoporous silica

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Abstract

Molybdenum sulfide hydrotreating catalysts promoted with nickel over tridimensional mesoporous silica (KIT-6 post synthesis modified with alumina) were prepared with three different chelating agents. Citric acid and EDTA (ethylenediaminetetraacetic acid) were used as typical chelates and the new suggestion, polyacrylic acid as a polymeric agent. The catalysts were synthesized by the incipient wetness impregnation method, and two different activation methods were applied to determine the correlation between the chelating agent and activation conditions. The beneficial use of chelating agents was evaluated in their performance on HDS (hydrodesulfurization) of DBT (dibenzothiophene). To determine the properties of catalysts, nitrogen physisorption, X-ray diffraction, HRTEM (high-resolution transmission electron microscopy), and TGA (thermogravimetric analysis) were used. The beneficial effect of chelating Ni during impregnation to avoid NiSx formation and thus promoting NiMoS arrangement was clearly observed in the catalytic HDS performance, and the TGA analysis of Ni-chelate complexes also confirms this theory. The catalyst with the best performance in the HDS reaction of DBT was the synthesized with citric acid and a slow rate temperature sulfidation.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge the Mexican Council of Science and Technology (CONACYT) and to the Energy Department (SENER) for supporting this work through the projects CONACYT-SENER-Hidrocarburos No. 120135. In addition, the authors acknowledge the excellent work of Carlos Elias Ornelas Gutierrez from NanoTech CIMAV for technical support for TEM images.

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  1. Departamento de Ingeniería y Química de los Materiales, Centro de Investigación en Materiales Avanzados S. C. (CIMAV), Chihuahua, 31136, Chih, México

    Karen A. Beltrán, Lorena Álvarez-Contreras, Anabel De la Cruz & Alfredo Aguilar-Elguezabal

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  1. Karen A. Beltrán
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  2. Lorena Álvarez-Contreras
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  3. Anabel De la Cruz
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  4. Alfredo Aguilar-Elguezabal
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Correspondence to Lorena Álvarez-Contreras.

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Beltrán, K.A., Álvarez-Contreras, L., De la Cruz, A. et al. Study of the impregnation of NiMo assisted by chelating agents for hydrodesulfurization-supported catalysts over mesoporous silica. Journal of Materials Research 33, 3604–3613 (2018). https://doi.org/10.1557/jmr.2018.314

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