Development of oxide-supported nickel-based catalysts for catalytic decomposition of dimethyl sulfide. (15th November 2018)

• Record Type: Journal Article
• Authors: Shimoda, Naohiro; Koide, Nao; Kasahara, Masaki; Mukoyama, Takashi; Satokawa, Shigeo
• Is Part Of: Fuel. Volume 232(2018)
• Page Start: 485
• Page End: 494
• Publication Date: 2018-11-15
• Subjects: Fuel cell systems -- Desulfurization -- Dimethyl sulfide -- Direct decomposition -- Nickel -- Gamma-alumina; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2018.06.009
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Dimethyl sulfide decomposition on various supported metal catalysts was studied. The γ -Al2 O3 supported Ni catalyst exhibits the best performance. Optimum Ni loading amount for the Ni/ γ -Al2 O3 catalyst is 10 wt%. Ni species in the Ni/ γ -Al2 O3 catalyst exist as NiO and NiAl2 O4 . NiO component is easily sulfided to NiS and contributes to decomposition activity. Abstract: We have developed a heterogeneous catalyst for the decomposition and removal of dimethyl sulfide used as an odorant in fuels such as city gas in residential fuel cell systems. For the dimethyl sulfide decomposition at 500 °C over various oxides such as γ -Al2 O3, TiO2, ZrO2, CeO2, SiO2, and MgO, it was found that adsorption of dimethyl sulfide and other products containing sulfur components, sulfurization of metal oxides, and decomposition of dimethyl sulfide occurred. Namely, dimethyl sulfide could be removed from the reaction gas by several reactions. Furthermore, the loading of the nickel component on γ -Al2 O3 as a metal component led to high decomposition performance. Based on the XRD, H2 -TPR, and UV–Vis spectra analyses, after the preparation, this catalyst exists in the state of nickel oxide and nickel aluminate supported on γ -Al2 O3 . However, upon exposure to the dimethyl sulfide or hydrogen sulfide feed, the sulfurization reaction of nickel species proceeds, leading to the transformation of the material to nickel sulfide and the enhancement of the decomposition reaction. Furthermore, based on the results of the optimization of the nickel loading amount, we revealed that the 10 wt% supported catalyst was the best catalyst.