Sulfonated polyether ether ketone （SPEEK） based composite membranes for direct methanol fuel cell （DMFC） application were prepared by sol-gel reaction of tetraethoxysilane （TEOS） in the SPEEK matrix and the inco...Sulfonated polyether ether ketone （SPEEK） based composite membranes for direct methanol fuel cell （DMFC） application were prepared by sol-gel reaction of tetraethoxysilane （TEOS） in the SPEEK matrix and the incorporation of phosphotungstic acid （PWA）.The conductivity of the developed membranes was determined by impedance spectroscopy and the methanol permeability through the membranes was obtained from diffuseness experiments.The SEM images show that the addition of SiO2 and the covalent cross-linking structure lead to fine PWA particles and more uniformly dispersion.The swelling of composite membranes remains in the range of 5%-8% at 30-90 ℃ and the effusion of PWA reduces significantly.The composite membranes show a good balance in higher proton conductivity and lower methanol permeation.The cell with composite membrane has higher open circuit voltage（0.728 V） and higher peak power density（45 mW/cm2） than that with Nafion117.展开更多
The recent studies of direct alcohol/ether synthesis process in slurry reactors were reviewed,and the research work in our laboratory was carried out in this paper.a global kinetics model for direct dimethyl ether(DME...The recent studies of direct alcohol/ether synthesis process in slurry reactors were reviewed,and the research work in our laboratory was carried out in this paper.a global kinetics model for direct dimethyl ether(DME)synthesis from syngas over a novel Cu-Zn-Al-Zr slurry catalyst was established according to the total of 25 experimental data,and a steady-state one-dimensional mathematical model was further developed in bubble column slurry reactor(BCSR),which was assumed that the bubble phase was plug flow,and the liquid phase was fully mixed flow.The numerical simulations of reactor design of 100000 t/a dimethyl ether pilot plant indicate that higher pressure and lower temperature were favorable to the increase of CO conversion,selectivity of dimethyl ether,product yield and height of slurry bed.The optimal operating conditions for DME synthesis process were obtained:reaction temperature at 240℃,reactor pressure at 5 MPa and reactor diameter of 2.5 m.展开更多
基金Funded by Ministry of Education, Hubei, China (No.Q20091403)
文摘Sulfonated polyether ether ketone （SPEEK） based composite membranes for direct methanol fuel cell （DMFC） application were prepared by sol-gel reaction of tetraethoxysilane （TEOS） in the SPEEK matrix and the incorporation of phosphotungstic acid （PWA）.The conductivity of the developed membranes was determined by impedance spectroscopy and the methanol permeability through the membranes was obtained from diffuseness experiments.The SEM images show that the addition of SiO2 and the covalent cross-linking structure lead to fine PWA particles and more uniformly dispersion.The swelling of composite membranes remains in the range of 5%-8% at 30-90 ℃ and the effusion of PWA reduces significantly.The composite membranes show a good balance in higher proton conductivity and lower methanol permeation.The cell with composite membrane has higher open circuit voltage（0.728 V） and higher peak power density（45 mW/cm2） than that with Nafion117.
基金supported by a grant from the Major State Basic Research Development Program of China(973 Program,No.2005CB221205).
文摘The recent studies of direct alcohol/ether synthesis process in slurry reactors were reviewed,and the research work in our laboratory was carried out in this paper.a global kinetics model for direct dimethyl ether(DME)synthesis from syngas over a novel Cu-Zn-Al-Zr slurry catalyst was established according to the total of 25 experimental data,and a steady-state one-dimensional mathematical model was further developed in bubble column slurry reactor(BCSR),which was assumed that the bubble phase was plug flow,and the liquid phase was fully mixed flow.The numerical simulations of reactor design of 100000 t/a dimethyl ether pilot plant indicate that higher pressure and lower temperature were favorable to the increase of CO conversion,selectivity of dimethyl ether,product yield and height of slurry bed.The optimal operating conditions for DME synthesis process were obtained:reaction temperature at 240℃,reactor pressure at 5 MPa and reactor diameter of 2.5 m.
