Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide fro... more Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide from hydrogen-rich streams. The present study analyses the thermodynamic efficiency penalty of this separation step and the achievable carbon capture ratio, with particular focus on high-temperature separation technologies: sorption-enhanced water-gas shift (SEWGS) and palladium membranes. Twelve different cases have been simulated, starting from coal-derived syngas or from natural gas derived reformate, using carbon dioxide capture by conventional absorption, SEWGS, and palladium membranes, and producing hydrogen-rich fuel for power production or pure hydrogen. For the production of decarbonised fuel from coal syngas, SEWGS always yields the lowest efficiency penalty per unit of carbon dioxide captured. For the production of pure hydrogen from coal syngas, SEWGS has a significantly higher carbon capture ratio than the alternatives while palladium membranes yield the lowest efficiency penalty per unit of carbon dioxide captured. For the production of decarbonised fuel from natural gas reformate, SEWGS is the most efficient technology in terms of efficiency penalty. For the production of pure hydrogen from natural gas syngas, palladium membranes yield the lowest efficiency penalty. Nomenclature CCR molar carbon capture ratio,-CO x CR molar carbon oxides capture ratio,-CP carbon molar purity,-EBTF European Benchmarking Task Force F m mass flow rate, kg s −1 F mol molar flow rate, kg s −1 HP hydrogen molar purity,-HRF hydrogen recovery factor,-HTS high-temperature water-gas shift IGCC integrated gasification combined cycle for coal LHV lower heating value, MJ kg −1
Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide fro... more Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide from hydrogen-rich streams. The present study analyses the thermodynamic efficiency penalty of this separation step and the achievable carbon capture ratio, with particular focus on high-temperature separation technologies: sorption-enhanced water-gas shift (SEWGS) and palladium membranes. Twelve different cases have been simulated, starting from coal-derived syngas or from natural gas derived reformate, using carbon dioxide capture by conventional absorption, SEWGS, and palladium membranes, and producing hydrogen-rich fuel for power production or pure hydrogen. For the production of decarbonised fuel from coal syngas, SEWGS always yields the lowest efficiency penalty per unit of carbon dioxide captured. For the production of pure hydrogen from coal syngas, SEWGS has a significantly higher carbon capture ratio than the alternatives while palladium membranes yield the lowest efficiency penalty per unit of carbon dioxide captured. For the production of decarbonised fuel from natural gas reformate, SEWGS is the most efficient technology in terms of efficiency penalty. For the production of pure hydrogen from natural gas syngas, palladium membranes yield the lowest efficiency penalty. Nomenclature CCR molar carbon capture ratio,-CO x CR molar carbon oxides capture ratio,-CP carbon molar purity,-EBTF European Benchmarking Task Force F m mass flow rate, kg s −1 F mol molar flow rate, kg s −1 HP hydrogen molar purity,-HRF hydrogen recovery factor,-HTS high-temperature water-gas shift IGCC integrated gasification combined cycle for coal LHV lower heating value, MJ kg −1
The influence of the nature of the support on the activity of rhodium-based catalysts in the cata... more The influence of the nature of the support on the activity of rhodium-based catalysts in the catalytic reforming of methane has been studied. Based on the variety of applications of methane reforming a selection of supports was made including fluorites, perovskites and aluminum oxide. In the absence of rhodium, the perovskite and fluorite supports, i.e. SrFe0.67Co0.33O3+, La 0.6Sr0.4Co0.2Fe0.8O3+, Ce 0.8Gd0.2O1.9+, and CeO2-ZrO2 all showed activity for the total combustion of methane but proved to be poor reforming catalysts. Impregnation of the fluorite and alumina supports with rhodium provided active catalysts for the reforming of methane. The activity of perovskite -supported rhodium appeared to depend strongly on the reducibility of the perovskite. Rhodium supported on La0.77Sr0.13MnO3+ is a reasonably active catalyst, but it deactivates rapidly. Rhodium supported on mixed valence oxides SrFe0.67Co0.33O3+ or La0.6Sr0.4Co0.2Fe0.8O3+ is hardly more active than the bare supp...
Sorption-enhanced water-gas shift (SEWGS) is a technology for pre-combustion CO 2 capture, which ... more Sorption-enhanced water-gas shift (SEWGS) is a technology for pre-combustion CO 2 capture, which can be integrated in an IGCC plant. A computer model is used to simulate the SEWGS unit, using a counter-current steam rinse cycle with one equalization step. The ...
ABSTRACT This study investigated the water-gas shift reaction in a bench-scale membrane reactor (... more ABSTRACT This study investigated the water-gas shift reaction in a bench-scale membrane reactor (M-WGS), where three supported Pd membranes of 44 cm in length and ca. 6 μm in thickness were used, reaching a total membrane surface area of 580.6 cm2. The WGS reaction was studied with the syngas mixture: 4.0% CO, 19.2% CO2, 15.4% H2O, 1.2% CH4 and 60.1% H2, under high temperature/pressure conditions: T = 673 K, pfeed = 20–35 bar(a), pperm = 15 bar(a), mimicking CO2 capture with co-production of H2 in a natural gas fired power plant. High reaction pressure and high permeation of Pd membranes allowed for near complete CO conversion and H2 recovery. Both the membranes and the membrane reactor demonstrated a long-term stability under the investigated conditions, indicating the potential of M-WGS to substitute conventional systems.
Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide fro... more Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide from hydrogen-rich streams. The present study analyses the thermodynamic efficiency penalty of this separation step and the achievable carbon capture ratio, with particular focus on high-temperature separation technologies: sorption-enhanced water-gas shift (SEWGS) and palladium membranes. Twelve different cases have been simulated, starting from coal-derived syngas or from natural gas derived reformate, using carbon dioxide capture by conventional absorption, SEWGS, and palladium membranes, and producing hydrogen-rich fuel for power production or pure hydrogen. For the production of decarbonised fuel from coal syngas, SEWGS always yields the lowest efficiency penalty per unit of carbon dioxide captured. For the production of pure hydrogen from coal syngas, SEWGS has a significantly higher carbon capture ratio than the alternatives while palladium membranes yield the lowest efficiency penalty per unit of carbon dioxide captured. For the production of decarbonised fuel from natural gas reformate, SEWGS is the most efficient technology in terms of efficiency penalty. For the production of pure hydrogen from natural gas syngas, palladium membranes yield the lowest efficiency penalty. Nomenclature CCR molar carbon capture ratio,-CO x CR molar carbon oxides capture ratio,-CP carbon molar purity,-EBTF European Benchmarking Task Force F m mass flow rate, kg s −1 F mol molar flow rate, kg s −1 HP hydrogen molar purity,-HRF hydrogen recovery factor,-HTS high-temperature water-gas shift IGCC integrated gasification combined cycle for coal LHV lower heating value, MJ kg −1
Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide fro... more Pre-combustion capture of carbon dioxide requires the industrial separation of carbon dioxide from hydrogen-rich streams. The present study analyses the thermodynamic efficiency penalty of this separation step and the achievable carbon capture ratio, with particular focus on high-temperature separation technologies: sorption-enhanced water-gas shift (SEWGS) and palladium membranes. Twelve different cases have been simulated, starting from coal-derived syngas or from natural gas derived reformate, using carbon dioxide capture by conventional absorption, SEWGS, and palladium membranes, and producing hydrogen-rich fuel for power production or pure hydrogen. For the production of decarbonised fuel from coal syngas, SEWGS always yields the lowest efficiency penalty per unit of carbon dioxide captured. For the production of pure hydrogen from coal syngas, SEWGS has a significantly higher carbon capture ratio than the alternatives while palladium membranes yield the lowest efficiency penalty per unit of carbon dioxide captured. For the production of decarbonised fuel from natural gas reformate, SEWGS is the most efficient technology in terms of efficiency penalty. For the production of pure hydrogen from natural gas syngas, palladium membranes yield the lowest efficiency penalty. Nomenclature CCR molar carbon capture ratio,-CO x CR molar carbon oxides capture ratio,-CP carbon molar purity,-EBTF European Benchmarking Task Force F m mass flow rate, kg s −1 F mol molar flow rate, kg s −1 HP hydrogen molar purity,-HRF hydrogen recovery factor,-HTS high-temperature water-gas shift IGCC integrated gasification combined cycle for coal LHV lower heating value, MJ kg −1
The influence of the nature of the support on the activity of rhodium-based catalysts in the cata... more The influence of the nature of the support on the activity of rhodium-based catalysts in the catalytic reforming of methane has been studied. Based on the variety of applications of methane reforming a selection of supports was made including fluorites, perovskites and aluminum oxide. In the absence of rhodium, the perovskite and fluorite supports, i.e. SrFe0.67Co0.33O3+, La 0.6Sr0.4Co0.2Fe0.8O3+, Ce 0.8Gd0.2O1.9+, and CeO2-ZrO2 all showed activity for the total combustion of methane but proved to be poor reforming catalysts. Impregnation of the fluorite and alumina supports with rhodium provided active catalysts for the reforming of methane. The activity of perovskite -supported rhodium appeared to depend strongly on the reducibility of the perovskite. Rhodium supported on La0.77Sr0.13MnO3+ is a reasonably active catalyst, but it deactivates rapidly. Rhodium supported on mixed valence oxides SrFe0.67Co0.33O3+ or La0.6Sr0.4Co0.2Fe0.8O3+ is hardly more active than the bare supp...
Sorption-enhanced water-gas shift (SEWGS) is a technology for pre-combustion CO 2 capture, which ... more Sorption-enhanced water-gas shift (SEWGS) is a technology for pre-combustion CO 2 capture, which can be integrated in an IGCC plant. A computer model is used to simulate the SEWGS unit, using a counter-current steam rinse cycle with one equalization step. The ...
ABSTRACT This study investigated the water-gas shift reaction in a bench-scale membrane reactor (... more ABSTRACT This study investigated the water-gas shift reaction in a bench-scale membrane reactor (M-WGS), where three supported Pd membranes of 44 cm in length and ca. 6 μm in thickness were used, reaching a total membrane surface area of 580.6 cm2. The WGS reaction was studied with the syngas mixture: 4.0% CO, 19.2% CO2, 15.4% H2O, 1.2% CH4 and 60.1% H2, under high temperature/pressure conditions: T = 673 K, pfeed = 20–35 bar(a), pperm = 15 bar(a), mimicking CO2 capture with co-production of H2 in a natural gas fired power plant. High reaction pressure and high permeation of Pd membranes allowed for near complete CO conversion and H2 recovery. Both the membranes and the membrane reactor demonstrated a long-term stability under the investigated conditions, indicating the potential of M-WGS to substitute conventional systems.
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Papers by Jurriaan Boon