Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene

Hydrodesulfurization (HDS) is a widely used process currently employed in petroleum refineries to eliminate organosulfur compounds in fuels. The current hydrotreating process struggles to remove organosulfur compounds with a steric hindrance due to the electronic nature of the current catalysts empl...

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Autores principales:	Siphumelele Majodina, Zenixole R. Tshentu, Adeniyi S. Ogunlaja
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hydrodesulfurization (HDS) chelating ligands molybdenum disulfide (MoS<sub>2</sub>) dibenzothiophene RhMo-(L)-γ-Al<sub>2</sub>O<sub>3</sub> Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/7e8f30c37c664093bf5fadf707498362
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spelling	oai:doaj.org-article:7e8f30c37c664093bf5fadf7074983622021-11-25T17:06:47ZEffect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene10.3390/catal111113982073-4344https://doaj.org/article/7e8f30c37c664093bf5fadf7074983622021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1398https://doaj.org/toc/2073-4344Hydrodesulfurization (HDS) is a widely used process currently employed in petroleum refineries to eliminate organosulfur compounds in fuels. The current hydrotreating process struggles to remove organosulfur compounds with a steric hindrance due to the electronic nature of the current catalysts employed. In this work, the effects of adding chelating ligands such as ethylenediaminetetraacetic acid (EDTA), citric acid (CA) and acetic acid (AA) to rhodium (Rh) and active molybdenum (Mo) species for dibenzothiophene (DBT) HDS catalytic activity was evaluated. HDS activities followed the order of RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> (88%) > RhMo-AA/ɣ-Al<sub>2</sub>O<sub>3</sub> (73%) > RhMo-CA/ɣ-Al<sub>2</sub>O<sub>3</sub> (72%) > RhMo-EDTA/ɣ-Al<sub>2</sub>O<sub>3</sub> (68%). The observed trend was attributed to the different chelating ligands with varying electronic properties, thus influencing the metal–support interaction and the favorable reduction of the Mo species. RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> offered the highest HDS activity due to its (i) lower metal–support interaction energy, as observed from the RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> band gap of 3.779 eV and the slight shift toward the lower BE of Mo 3d, (ii) increased Mo-O-Mo species (N<sub>Mo-O-Mo</sub> ~1.975) and (iii) better sulfidation of Rh and MoO in RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> compared to the chelated catalysts. The obtained data provides that HDS catalytic activity was mainly driven by the structural nature of the RhMo-based catalyst, which influences the formation of more active sites that can enhance the HDS activity.Siphumelele MajodinaZenixole R. TshentuAdeniyi S. OgunlajaMDPI AGarticlehydrodesulfurization (HDS)chelating ligandsmolybdenum disulfide (MoS<sub>2</sub>)dibenzothiopheneRhMo-(L)-γ-Al<sub>2</sub>O<sub>3</sub>Chemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1398, p 1398 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hydrodesulfurization (HDS) chelating ligands molybdenum disulfide (MoS<sub>2</sub>) dibenzothiophene RhMo-(L)-γ-Al<sub>2</sub>O<sub>3</sub> Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	hydrodesulfurization (HDS) chelating ligands molybdenum disulfide (MoS<sub>2</sub>) dibenzothiophene RhMo-(L)-γ-Al<sub>2</sub>O<sub>3</sub> Chemical technology TP1-1185 Chemistry QD1-999 Siphumelele Majodina Zenixole R. Tshentu Adeniyi S. Ogunlaja Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene
description	Hydrodesulfurization (HDS) is a widely used process currently employed in petroleum refineries to eliminate organosulfur compounds in fuels. The current hydrotreating process struggles to remove organosulfur compounds with a steric hindrance due to the electronic nature of the current catalysts employed. In this work, the effects of adding chelating ligands such as ethylenediaminetetraacetic acid (EDTA), citric acid (CA) and acetic acid (AA) to rhodium (Rh) and active molybdenum (Mo) species for dibenzothiophene (DBT) HDS catalytic activity was evaluated. HDS activities followed the order of RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> (88%) > RhMo-AA/ɣ-Al<sub>2</sub>O<sub>3</sub> (73%) > RhMo-CA/ɣ-Al<sub>2</sub>O<sub>3</sub> (72%) > RhMo-EDTA/ɣ-Al<sub>2</sub>O<sub>3</sub> (68%). The observed trend was attributed to the different chelating ligands with varying electronic properties, thus influencing the metal–support interaction and the favorable reduction of the Mo species. RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> offered the highest HDS activity due to its (i) lower metal–support interaction energy, as observed from the RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> band gap of 3.779 eV and the slight shift toward the lower BE of Mo 3d, (ii) increased Mo-O-Mo species (N<sub>Mo-O-Mo</sub> ~1.975) and (iii) better sulfidation of Rh and MoO in RhMo/ɣ-Al<sub>2</sub>O<sub>3</sub> compared to the chelated catalysts. The obtained data provides that HDS catalytic activity was mainly driven by the structural nature of the RhMo-based catalyst, which influences the formation of more active sites that can enhance the HDS activity.
format	article
author	Siphumelele Majodina Zenixole R. Tshentu Adeniyi S. Ogunlaja
author_facet	Siphumelele Majodina Zenixole R. Tshentu Adeniyi S. Ogunlaja
author_sort	Siphumelele Majodina
title	Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene
title_short	Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene
title_full	Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene
title_fullStr	Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene
title_full_unstemmed	Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene
title_sort	effect of adding chelating ligands on the catalytic performance of rh-promoted mos<sub>2</sub> in the hydrodesulfurization of dibenzothiophene
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7e8f30c37c664093bf5fadf707498362
work_keys_str_mv	AT siphumelelemajodina effectofaddingchelatingligandsonthecatalyticperformanceofrhpromotedmossub2subinthehydrodesulfurizationofdibenzothiophene AT zenixolertshentu effectofaddingchelatingligandsonthecatalyticperformanceofrhpromotedmossub2subinthehydrodesulfurizationofdibenzothiophene AT adeniyisogunlaja effectofaddingchelatingligandsonthecatalyticperformanceofrhpromotedmossub2subinthehydrodesulfurizationofdibenzothiophene
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Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS<sub>2</sub> in the Hydrodesulfurization of Dibenzothiophene

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