Inspection over carbon deposition features of various nickel catalysts during simulated biogas dry reforming. (1st July 2020)

• Record Type: Journal Article
• Authors: Gao, Yuchen; Aihemaiti, Aikelaimu; Jiang, Jianguo; Meng, Yuan; Ju, Tongyao; Han, Siyu; Chen, Xuejing; Liu, Jiwei
• Is Part Of: Journal of cleaner production. Volume 260(2020)
• Publication Date: 2020-07-01
• Subjects: Biogas -- Dry reforming -- Ni catalyst -- Hydrogen production -- Carbon deposition -- Support; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.120944
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Dry reforming is a promising new technology for biogas utilization. Herein, Ni catalysts using Al2 O3, SiO2, MgO, CeO2 and ZnO as supports were prepared and studied to uncover the correlation between physico-chemical properties and activity, also their specific response to carbon formation. The catalysts were characterized systematically via N2 -physisorption, XRD, TEM, EDS, H2 -TPR, XPS and TGA. The catalytic activity was investigated at 600–850 °C and stability tests were conducted at 750 °C for 12 h. Ni/Al2 O3 showed the highest activity with CH4 conversion efficiency due to smaller particle size and stronger metal-support interaction, but seriously plugged the reactor during stability test. Ni/MgO was less active but also had an acceptable CH4 conversion efficiency of 68.8% and conversion rate of 4.70×10 −2 mmol/gcat ·s at 750 °C. It showed good stability due to the strong metal-support interaction. Ni/ZnO, Ni/CeO2 and Ni/SiO2 showed poor activity. Detailed carbon deposition feature analysis of spent catalysts illustrated that Ni/Al2 O3 had the most carbon deposition as filamentary and graphitic species. Ni/CeO2 mainly showed filamentary carbon, while Ni/MgO, Ni/ZnO and Ni/SiO2 bore little carbon during stability tests. Ni/MgO seems a suitable candidate in dry reforming reaction which can reach the balance of activity, stability and carbon resistance. Highlights: Correlation of support property and catalytic performance was recognized in depth. Carbon response of different materials was analyzed in new thinking. Important reference for Ni catalyst selection was provided.