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http://cimav.repositorioinstitucional.mx/jspui/handle/1004/2539| Study of the impregnation of NiMo assisted by polymeric chelating agent for HDS supported catalyst over mesoporous silica | |
| KAREN ALONDRA BELTRAN VERDUGO Alfredo Aguilar Elguezabal César Cutberto Leyva Porras Lorena Alvarez Contreras | |
| Acceso Abierto | |
| Atribución-NoComercial | |
| The increase in the atmospheric pollution has induced lower permissible sulfur content in the environmental laws. Industrially to fulfill these standards, it is employed catalysts and high-pressure processes. However, this is a task complicated because the high refractories sulfur composition of some crude oils. Nowadays, commercial unsupported catalysts meet these regulations, but with high costs. In consequence, many of the new scientific research is focused in the development of cheaper supported catalyst with low and well-dispersed metal loadings. In this context, despite the difficulties in obtaining highly dispersed catalyst, the most common and simple method is the incipient impregnation [1]. Additionally to the well dispersion of the active phase, it is necessary to attain a special configuration of the metals loaded on the catalyst. In the hydrodesulfuration (HDS) field, it is accepted that the MoS2 forms a hexagonal microstructure surrounded by Ni atoms located on the rim and edges. Sulfidation of Ni promoter begins at room temperature while the molybdenum precursor begins at 75 °C; this leads the formation of bulk NiSx crystals instead of the NiMoS highly active phase. One way to overcome this problem is to employ chelating agents to increase the viscosity and modify the activation temperature of the precursor. This yields that the sulfidation process occurs in the opposite direction i.e. Mo is first sulfided over the Ni, which produce a high proportion of NiMoS crystals. Commonly, the chelating agents contain carboxylic acid and amine functional groups, which produce a Lewis acid-base reaction with metals. Among these agents, citric acid and ethylenediaminetetraacetic acid (EDTA) are the most employed [2,3]. Therefore, in the present work, three chelating agents were employed in the synthesis of surface-modified NiMo catalysts supported on KIT-6 and their performance was compared in the HDS of a model molecule such as dibenzothiophene (DBT). | |
| 2017-06 | |
| Memoria de congreso | |
| Inglés | |
| OTRAS | |
| Versión publicada | |
| publishedVersion - Versión publicada | |
| Aparece en las colecciones: | Artículos de Congresos |
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