Sacrificial carbonaceous coating over alumina supported Ni–MoS2 catalyst for hydrodesulfurization. Issue 21 (16th April 2019)

• Record Type: Journal Article
• Authors: Xu, Yingrui; Li, Pengyun; Yuan, Shenghua; Sui, Baokuan; Lai, Weikun; Yi, Xiaodong; Fang, Weiping
• Is Part Of: RSC advances. Volume 9:Issue 21(2019)
• Page Start: 11951
• Page End: 11959
• Publication Date: 2019-04-16
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra00884e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Sacrificial carbon coating over NiMo/Al2 O3 catalyst effectively tailor the interaction between the active phase and support, which result in more easily reducible active components and enhanced HDS performance. Abstract : Recent results have evidenced that carbon plays an important role in stabilizing the structure of the active phase in catalysts. In this work, carbon-coated alumina was prepared by applying polydopamine (PDA) as a sacrificial carbon source to modify the surface properties of γ-alumina, which then was used as a support to prepare supported NiMo catalysts for hydrodesulfurization (HDS) of dibenzothiophene (DBT). NiMo/Al2 O3 catalysts exhibited limited hydrodesulfurization performances due to their strong metal-support interaction. Herein, we report an unexpected phenomenon that sacrificial carbon layers can be constructed on the surface of the Al2 O3 support from the carbonization of polydopamine (PDA) and mediated the interaction between the active site and support. Through the removal of carbon layers and sulfidation, the resulting NiMo catalysts exhibit excellent performance for HDS reaction of dibenzothiophene (DBT), which is associated with adequate loading of residual carbon species, leading to an enhanced amount of active species under sulfidation conditions. Moreover, the facile synthetic strategy can be extended to the stabilization of the active phase on a broad range of supports, providing a general approach for improving the metal-support interaction supported nanocatalysts.