| Fischer-Tropsch synthesis reaction is an important route to convert syngas to liquid fuels by catalysis. Iron and cobalt-based catalysts are widely applied to industrial production while ruthenium-based catalyst which possess the highest catalytic activity and strongest chain growth ability in Fischer-Tropsch synthesis, are usually applied to theory study. In order to eliminate the agglomeration of nanoclusters, looking for the appropriate carrier and the way for loading are important.Our research group has been committed to the study of polyimide(PI) materials,and began to study of polyimide hybrid materials from 2007. In this work, we fabricated polyimide/Ru and polysulfone/Ru nanocluster hybrid hollow fiber membrane reactor consisting of inorganic material of monodisperse ruthenium nanoclusters and polymer with the method of embedment by dry-wet spinning. The structure and performance of hybrid membrane were characterized and analyzed. The membrane reactor was used to obtain the high service life of the catalyst and regulate H2 and CO transmission rate in Fischer-Tropsch synthesis.Through the study of polysulfone(PSF) plate separation membrane, choose the suitable solid content(25%) and suitable solvent nonsolvent system(DMAc- water),examines the different additives(EG and PVP) on the influence of membrane structure and performance. By SEM, mechanical properties test and permeability test,it is concluded that the influence of different additives on membrane structure and the change of structure and mechanical properties, the laws between the permeability.With the increase of additive, membrane enhanced mechanical strength, permeability drops, higher selectivity. Also study the effect of the solvent composition on membrane performance, through mechanical properties investigation found that the right to adjust the solvent composition on membrane structure and performance will be a corresponding impact. In order to improve the stability of the phase separation membrane, proper heat treatment, the results show that: when the temperature is close to the glass transition temperature of polysulfone, for a certain time of heat treatment can eliminate the spongy structure of the compact layer and only can be obtained and micro hole big hole of membrane structure. For the defective phase separation membrane surface is a very meaningful, can effectively improve the mechanical stability and permeability of phase separation membrane, improve the selectivity of membrane with H2 and CO.Found the polymer preparation of appropriate size stability Ru nanoparticles cluster method, and on this basis, the use of Ru nanoparticles cluster and PSF hybridization, with hybrid membrane. By TEM, XRD, XPS, SEM and mechanical property test, the Ru nanoparticles cluster is obtained in PSF membrane can effectively dispersed, and the molecular chain of the PSF O, S and interaction.Of hybrid membrane structure observation can be found after heat treatment, heat treatment for membrane structure regulation has reached the expected.On the basis of flat membrane, the use of dry wet the polysulfone/Ru nanoparticles cluster hybrid hollow fiber membrane.On the basis of polysulfone,looking for the proper preparation of polysulfone and polysulfone/Ru nanoparticles cluster hybrid hollow fiber membrane spinning parameters, and made a series of different Ru load of hollow fiber membrane.Fee of reaction results achieved the purpose of regulating the reaction product distribution, has a good selectivity on C5 +product, and embedding the load is applied to the effectively prevent the loss of the catalyst poisoning, to enhance the stability of the catalyst and life. |
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