Upgrading greenhouse gases (methane and carbon dioxide) into syngas using nickel-based catalysts. (15th August 2018)

• Record Type: Journal Article
• Authors: Rego de Vasconcelos, Bruna; Pham Minh, Doan; Lyczko, Nathalie; Phan, Thanh Son; Sharrock, Patrick; Nzihou, Ange
• Is Part Of: Fuel. Volume 226(2018)
• Page Start: 195
• Page End: 203
• Publication Date: 2018-08-15
• Subjects: Greenhouse gases -- Catalyst deactivation -- Basicity -- Solid solution -- Carbon gasification; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2018.04.017
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: Formation of NiO-MgO solid solution enhanced the catalyst stability. Strong basicity and metal-support interaction enhanced the catalysts' performance. The deactivation rate of the catalysts was related to the type of carbon deposit. Water produced during the reaction was crucial to increase syngas production. Abstract: In this work, Mg-doped Al2 O3 supports were used for the preparation of Ni catalysts, which were then tested in dry reforming of methane reaction (DRM) for syngas production. The influence of MgO content (0–70 wt%) on the basicity of the catalysts as well as on the formation of a NiO-MgO solid solution was investigated and linked to the catalytic performance of the catalysts. The catalyst containing high amount of Mg (Ni/70MgAl) showed the best performance with negligible deactivation rate over 50 h of time on stream (TOS). The presence of strong basic sites in this catalyst was important to adsorb carbon dioxide (CO2 ), to gasify the coke deposit and to increase the syngas production. Also, the presence of a NiO-MgO solid solution led to strong metal-support interaction, which limited the sintering of nickel particles. The quantification of the water formed during the reaction showed that its formation was crucial for the elimination of the coke deposits as well as to increase the syngas production.