Biogas is an attractive renewable energy source, which could give an important contribution to drive the global energy system to a sustainable scenario. Because of the main problems related to the direct use of biogas, a promising alternative consists in the production of syngas by reforming processes, i.e. Dry Reforming (DR), Steam Reforming (SR) and Oxy-Steam Reforming (OSR) [1]. Based on the composition of the syngas, it can be used for the synthesis of chemicals, with special reference to Gas-to-Liquids technologies [2]. In this study, the catalytic activity of Me/CeO2-based structured cordierite monoliths (Me=Rh, Pt, Ni) has been preliminary probed in the SR of biogas (CH4/CO2=1.5), varying temperature (700-900°C) at fixed S/C (3) and weight space velocity (72,000 Nml gcat-1 h-1). Structured catalysts were lined by combining the Solution Combustion Synthesis with the Impregnation [3] Technique. Rh-based system ensures the highest performance towards the SR of biogas, with a methane conversion of ca. 99.8%. Then, the addition of oxygen (O/C=0.5) has been evaluated on the same system in the OSR of biogas at 900°C in order to have a syngas composition (CO:CO2=1:1; H2/(CO+CO2)=1.3) suitable for Fischer-Tropsch conversion. Fischer-Tropsch synthesis has been performed at 250°C and 20 bar on FeOx-based catalysts [4], studying the effect of catalytic (ZnO, CuO, MnO) and structural promoters (SiO2, Al2O3, CeO2) on the activity and selectivity to higher hydrocarbons. Iron-manganese-ceria catalyst (FTC-A, FTC-B) show the best catalytic performance in term of both carbon monoxide conversion and selectivity to high hydrocarbons, resulting also in the highest values of the ASF parameter (Fig. 1).
TUNING BIOGAS REFORMING PROCESSES ON Me/CeO2-BASED (Me = Rh, Pt, Ni) STRUCTURED MONOLITHS FOR FISCHER-TROPSCH SINTHESYS ON FeOx-BASED CATALYSTS
A Vita;C Italiano;A Palella;C Fabiano;L Pino;L Spadaro
2015
Abstract
Biogas is an attractive renewable energy source, which could give an important contribution to drive the global energy system to a sustainable scenario. Because of the main problems related to the direct use of biogas, a promising alternative consists in the production of syngas by reforming processes, i.e. Dry Reforming (DR), Steam Reforming (SR) and Oxy-Steam Reforming (OSR) [1]. Based on the composition of the syngas, it can be used for the synthesis of chemicals, with special reference to Gas-to-Liquids technologies [2]. In this study, the catalytic activity of Me/CeO2-based structured cordierite monoliths (Me=Rh, Pt, Ni) has been preliminary probed in the SR of biogas (CH4/CO2=1.5), varying temperature (700-900°C) at fixed S/C (3) and weight space velocity (72,000 Nml gcat-1 h-1). Structured catalysts were lined by combining the Solution Combustion Synthesis with the Impregnation [3] Technique. Rh-based system ensures the highest performance towards the SR of biogas, with a methane conversion of ca. 99.8%. Then, the addition of oxygen (O/C=0.5) has been evaluated on the same system in the OSR of biogas at 900°C in order to have a syngas composition (CO:CO2=1:1; H2/(CO+CO2)=1.3) suitable for Fischer-Tropsch conversion. Fischer-Tropsch synthesis has been performed at 250°C and 20 bar on FeOx-based catalysts [4], studying the effect of catalytic (ZnO, CuO, MnO) and structural promoters (SiO2, Al2O3, CeO2) on the activity and selectivity to higher hydrocarbons. Iron-manganese-ceria catalyst (FTC-A, FTC-B) show the best catalytic performance in term of both carbon monoxide conversion and selectivity to high hydrocarbons, resulting also in the highest values of the ASF parameter (Fig. 1).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.